diff --git a/controller/subscription.go b/controller/subscription.go
index 577e5196..8f53e5b8 100644
--- a/controller/subscription.go
+++ b/controller/subscription.go
@@ -168,6 +168,9 @@ func AdminCreateSubscriptionPlan(c *gin.Context) {
 	if req.Plan.AllowBalancePay == nil {
 		req.Plan.AllowBalancePay = common.GetPointer(true)
 	}
+	if req.Plan.AllowWalletOverflow == nil {
+		req.Plan.AllowWalletOverflow = common.GetPointer(true)
+	}
 	if req.Plan.DurationUnit == "" {
 		req.Plan.DurationUnit = model.SubscriptionDurationMonth
 	}
@@ -189,6 +192,13 @@ func AdminCreateSubscriptionPlan(c *gin.Context) {
 			return
 		}
 	}
+	req.Plan.DowngradeGroup = strings.TrimSpace(req.Plan.DowngradeGroup)
+	if req.Plan.DowngradeGroup != "" {
+		if _, ok := ratio_setting.GetGroupRatioCopy()[req.Plan.DowngradeGroup]; !ok {
+			common.ApiErrorMsg(c, "降级分组不存在")
+			return
+		}
+	}
 	req.Plan.QuotaResetPeriod = model.NormalizeResetPeriod(req.Plan.QuotaResetPeriod)
 	if req.Plan.QuotaResetPeriod == model.SubscriptionResetCustom && req.Plan.QuotaResetCustomSeconds <= 0 {
 		common.ApiErrorMsg(c, "自定义重置周期需大于0秒")
@@ -256,6 +266,13 @@ func AdminUpdateSubscriptionPlan(c *gin.Context) {
 			return
 		}
 	}
+	req.Plan.DowngradeGroup = strings.TrimSpace(req.Plan.DowngradeGroup)
+	if req.Plan.DowngradeGroup != "" {
+		if _, ok := ratio_setting.GetGroupRatioCopy()[req.Plan.DowngradeGroup]; !ok {
+			common.ApiErrorMsg(c, "降级分组不存在")
+			return
+		}
+	}
 	req.Plan.QuotaResetPeriod = model.NormalizeResetPeriod(req.Plan.QuotaResetPeriod)
 	if req.Plan.QuotaResetPeriod == model.SubscriptionResetCustom && req.Plan.QuotaResetCustomSeconds <= 0 {
 		common.ApiErrorMsg(c, "自定义重置周期需大于0秒")
@@ -280,6 +297,7 @@ func AdminUpdateSubscriptionPlan(c *gin.Context) {
 			"max_purchase_per_user":      req.Plan.MaxPurchasePerUser,
 			"total_amount":               req.Plan.TotalAmount,
 			"upgrade_group":              req.Plan.UpgradeGroup,
+			"downgrade_group":            req.Plan.DowngradeGroup,
 			"quota_reset_period":         req.Plan.QuotaResetPeriod,
 			"quota_reset_custom_seconds": req.Plan.QuotaResetCustomSeconds,
 			"updated_at":                 common.GetTimestamp(),
@@ -287,6 +305,9 @@ func AdminUpdateSubscriptionPlan(c *gin.Context) {
 		if req.Plan.AllowBalancePay != nil {
 			updateMap["allow_balance_pay"] = *req.Plan.AllowBalancePay
 		}
+		if req.Plan.AllowWalletOverflow != nil {
+			updateMap["allow_wallet_overflow"] = *req.Plan.AllowWalletOverflow
+		}
 		if err := tx.Model(&model.SubscriptionPlan{}).Where("id = ?", id).Updates(updateMap).Error; err != nil {
 			return err
 		}
diff --git a/model/main.go b/model/main.go
index 6d900246..39e17ff9 100644
--- a/model/main.go
+++ b/model/main.go
@@ -398,11 +398,13 @@ func ensureSubscriptionPlanTableSQLite() error {
 ` + "`enabled`" + ` numeric DEFAULT 1,
 ` + "`sort_order`" + ` integer DEFAULT 0,
 ` + "`allow_balance_pay`" + ` numeric DEFAULT 1,
+` + "`allow_wallet_overflow`" + ` numeric DEFAULT 1,
 ` + "`stripe_price_id`" + ` varchar(128) DEFAULT '',
 ` + "`creem_product_id`" + ` varchar(128) DEFAULT '',
 ` + "`waffo_pancake_product_id`" + ` varchar(128) DEFAULT '',
 ` + "`max_purchase_per_user`" + ` integer DEFAULT 0,
 ` + "`upgrade_group`" + ` varchar(64) DEFAULT '',
+` + "`downgrade_group`" + ` varchar(64) DEFAULT '',
 ` + "`total_amount`" + ` bigint NOT NULL DEFAULT 0,
 ` + "`quota_reset_period`" + ` varchar(16) DEFAULT 'never',
 ` + "`quota_reset_custom_seconds`" + ` bigint DEFAULT 0,
@@ -433,11 +435,13 @@ PRIMARY KEY (` + "`id`" + `)
 		{Name: "enabled", DDL: "`enabled` numeric DEFAULT 1"},
 		{Name: "sort_order", DDL: "`sort_order` integer DEFAULT 0"},
 		{Name: "allow_balance_pay", DDL: "`allow_balance_pay` numeric DEFAULT 1"},
+		{Name: "allow_wallet_overflow", DDL: "`allow_wallet_overflow` numeric DEFAULT 1"},
 		{Name: "stripe_price_id", DDL: "`stripe_price_id` varchar(128) DEFAULT ''"},
 		{Name: "creem_product_id", DDL: "`creem_product_id` varchar(128) DEFAULT ''"},
 		{Name: "waffo_pancake_product_id", DDL: "`waffo_pancake_product_id` varchar(128) DEFAULT ''"},
 		{Name: "max_purchase_per_user", DDL: "`max_purchase_per_user` integer DEFAULT 0"},
 		{Name: "upgrade_group", DDL: "`upgrade_group` varchar(64) DEFAULT ''"},
+		{Name: "downgrade_group", DDL: "`downgrade_group` varchar(64) DEFAULT ''"},
 		{Name: "total_amount", DDL: "`total_amount` bigint NOT NULL DEFAULT 0"},
 		{Name: "quota_reset_period", DDL: "`quota_reset_period` varchar(16) DEFAULT 'never'"},
 		{Name: "quota_reset_custom_seconds", DDL: "`quota_reset_custom_seconds` bigint DEFAULT 0"},
diff --git a/model/subscription.go b/model/subscription.go
index 2dc6db1c..12e4a02c 100644
--- a/model/subscription.go
+++ b/model/subscription.go
@@ -162,6 +162,9 @@ type SubscriptionPlan struct {
 
 	AllowBalancePay *bool `json:"allow_balance_pay" gorm:"default:true"`
 
+	// Allow falling back to wallet balance after subscription quota is exhausted (empty = true)
+	AllowWalletOverflow *bool `json:"allow_wallet_overflow" gorm:"default:true"`
+
 	StripePriceId         string `json:"stripe_price_id" gorm:"type:varchar(128);default:''"`
 	CreemProductId        string `json:"creem_product_id" gorm:"type:varchar(128);default:''"`
 	WaffoPancakeProductId string `json:"waffo_pancake_product_id" gorm:"type:varchar(128);default:''"`
@@ -172,6 +175,9 @@ type SubscriptionPlan struct {
 	// Upgrade user group after purchase (empty = no change)
 	UpgradeGroup string `json:"upgrade_group" gorm:"type:varchar(64);default:''"`
 
+	// Downgrade user group on expiry (empty = revert to the group held before purchase)
+	DowngradeGroup string `json:"downgrade_group" gorm:"type:varchar(64);default:''"`
+
 	// Total quota (amount in quota units, 0 = unlimited)
 	TotalAmount int64 `json:"total_amount" gorm:"type:bigint;not null;default:0"`
 
@@ -199,6 +205,9 @@ func (p *SubscriptionPlan) NormalizeDefaults() {
 	if p.AllowBalancePay == nil {
 		p.AllowBalancePay = common.GetPointer(true)
 	}
+	if p.AllowWalletOverflow == nil {
+		p.AllowWalletOverflow = common.GetPointer(true)
+	}
 }
 
 // Subscription order (payment -> webhook -> create UserSubscription)
@@ -261,6 +270,12 @@ type UserSubscription struct {
 	UpgradeGroup  string `json:"upgrade_group" gorm:"type:varchar(64);default:''"`
 	PrevUserGroup string `json:"prev_user_group" gorm:"type:varchar(64);default:''"`
 
+	// Downgrade target group on expiry (snapshot from plan; empty = revert to PrevUserGroup)
+	DowngradeGroup string `json:"downgrade_group" gorm:"type:varchar(64);default:''"`
+
+	// Whether wallet fallback is allowed after this subscription's quota is exhausted (snapshot from plan)
+	AllowWalletOverflow bool `json:"allow_wallet_overflow" gorm:"default:true"`
+
 	CreatedAt int64 `json:"created_at" gorm:"bigint"`
 	UpdatedAt int64 `json:"updated_at" gorm:"bigint"`
 }
@@ -416,17 +431,17 @@ func downgradeUserGroupForSubscriptionTx(tx *gorm.DB, sub *UserSubscription, now
 	if tx == nil || sub == nil {
 		return "", errors.New("invalid downgrade args")
 	}
+	downgradeGroup := strings.TrimSpace(sub.DowngradeGroup)
 	upgradeGroup := strings.TrimSpace(sub.UpgradeGroup)
-	if upgradeGroup == "" {
+	// Nothing to do if neither an explicit downgrade target nor an upgrade snapshot exists.
+	if downgradeGroup == "" && upgradeGroup == "" {
 		return "", nil
 	}
 	currentGroup, err := getUserGroupByIdTx(tx, sub.UserId)
 	if err != nil {
 		return "", err
 	}
-	if currentGroup != upgradeGroup {
-		return "", nil
-	}
+	// If another active upgraded subscription exists, keep the current group.
 	var activeSub UserSubscription
 	activeQuery := tx.Where("user_id = ? AND status = ? AND end_time > ? AND id <> ? AND upgrade_group <> ''",
 		sub.UserId, "active", now, sub.Id).
@@ -436,15 +451,24 @@ func downgradeUserGroupForSubscriptionTx(tx *gorm.DB, sub *UserSubscription, now
 	if activeQuery.Error == nil && activeQuery.RowsAffected > 0 {
 		return "", nil
 	}
-	prevGroup := strings.TrimSpace(sub.PrevUserGroup)
-	if prevGroup == "" || prevGroup == currentGroup {
+	// Determine the downgrade target: an explicit downgrade group takes precedence,
+	// otherwise revert to the group held before purchase (legacy behavior).
+	target := downgradeGroup
+	if target == "" {
+		// Legacy behavior: only revert when the subscription actually elevated the user.
+		if currentGroup != upgradeGroup {
+			return "", nil
+		}
+		target = strings.TrimSpace(sub.PrevUserGroup)
+	}
+	if target == "" || target == currentGroup {
 		return "", nil
 	}
 	if err := tx.Model(&User{}).Where("id = ?", sub.UserId).
-		Update("group", prevGroup).Error; err != nil {
+		Update("group", target).Error; err != nil {
 		return "", err
 	}
-	return prevGroup, nil
+	return target, nil
 }
 
 func CreateUserSubscriptionFromPlanTx(tx *gorm.DB, userId int, plan *SubscriptionPlan, source string) (*UserSubscription, error) {
@@ -495,21 +519,27 @@ func CreateUserSubscriptionFromPlanTx(tx *gorm.DB, userId int, plan *Subscriptio
 			}
 		}
 	}
+	allowWalletOverflow := true
+	if plan.AllowWalletOverflow != nil {
+		allowWalletOverflow = *plan.AllowWalletOverflow
+	}
 	sub := &UserSubscription{
-		UserId:        userId,
-		PlanId:        plan.Id,
-		AmountTotal:   plan.TotalAmount,
-		AmountUsed:    0,
-		StartTime:     now.Unix(),
-		EndTime:       endUnix,
-		Status:        "active",
-		Source:        source,
-		LastResetTime: lastReset,
-		NextResetTime: nextReset,
-		UpgradeGroup:  upgradeGroup,
-		PrevUserGroup: prevGroup,
-		CreatedAt:     common.GetTimestamp(),
-		UpdatedAt:     common.GetTimestamp(),
+		UserId:              userId,
+		PlanId:              plan.Id,
+		AmountTotal:         plan.TotalAmount,
+		AmountUsed:          0,
+		StartTime:           now.Unix(),
+		EndTime:             endUnix,
+		Status:              "active",
+		Source:              source,
+		LastResetTime:       lastReset,
+		NextResetTime:       nextReset,
+		UpgradeGroup:        upgradeGroup,
+		PrevUserGroup:       prevGroup,
+		DowngradeGroup:      strings.TrimSpace(plan.DowngradeGroup),
+		AllowWalletOverflow: allowWalletOverflow,
+		CreatedAt:           common.GetTimestamp(),
+		UpdatedAt:           common.GetTimestamp(),
 	}
 	if err := tx.Create(sub).Error; err != nil {
 		return nil, err
@@ -811,6 +841,24 @@ func HasActiveUserSubscription(userId int) (bool, error) {
 	return count > 0, nil
 }
 
+// UserActiveSubscriptionsAllowWalletOverflow returns whether wallet balance may be used
+// after the user's subscription quota is exhausted. A single active subscription that
+// disallows wallet overflow (allow_wallet_overflow = false) blocks the fallback.
+func UserActiveSubscriptionsAllowWalletOverflow(userId int) (bool, error) {
+	if userId <= 0 {
+		return false, errors.New("invalid userId")
+	}
+	now := common.GetTimestamp()
+	var strictCount int64
+	if err := DB.Model(&UserSubscription{}).
+		Where("user_id = ? AND status = ? AND end_time > ? AND allow_wallet_overflow = ?",
+			userId, "active", now, false).
+		Count(&strictCount).Error; err != nil {
+		return false, err
+	}
+	return strictCount == 0, nil
+}
+
 // GetAllUserSubscriptions returns all subscriptions (active and expired) for a user.
 func GetAllUserSubscriptions(userId int) ([]SubscriptionSummary, error) {
 	if userId <= 0 {
@@ -982,9 +1030,10 @@ func ExpireDueSubscriptions(limit int) (int, error) {
 				return nil
 			}
 
-			// No active upgraded subscription, downgrade to previous group if needed.
+			// Find the most recently expired subscription that defines a group transition
+			// (an explicit downgrade target or an upgrade snapshot to revert).
 			var lastExpired UserSubscription
-			expiredQuery := tx.Where("user_id = ? AND status = ? AND upgrade_group <> ''",
+			expiredQuery := tx.Where("user_id = ? AND status = ? AND (downgrade_group <> '' OR upgrade_group <> '')",
 				userId, "expired").
 				Order("end_time desc, id desc").
 				Limit(1).
@@ -992,23 +1041,33 @@ func ExpireDueSubscriptions(limit int) (int, error) {
 			if expiredQuery.Error != nil || expiredQuery.RowsAffected == 0 {
 				return nil
 			}
-			upgradeGroup := strings.TrimSpace(lastExpired.UpgradeGroup)
-			prevGroup := strings.TrimSpace(lastExpired.PrevUserGroup)
-			if upgradeGroup == "" || prevGroup == "" {
-				return nil
-			}
 			currentGroup, err := getUserGroupByIdTx(tx, userId)
 			if err != nil {
 				return err
 			}
-			if currentGroup != upgradeGroup || currentGroup == prevGroup {
+			// An explicit downgrade group takes precedence; otherwise revert to the
+			// group held before purchase (legacy behavior, only when the subscription
+			// actually elevated the user).
+			target := strings.TrimSpace(lastExpired.DowngradeGroup)
+			if target == "" {
+				upgradeGroup := strings.TrimSpace(lastExpired.UpgradeGroup)
+				prevGroup := strings.TrimSpace(lastExpired.PrevUserGroup)
+				if upgradeGroup == "" || prevGroup == "" {
+					return nil
+				}
+				if currentGroup != upgradeGroup {
+					return nil
+				}
+				target = prevGroup
+			}
+			if target == "" || target == currentGroup {
 				return nil
 			}
 			if err := tx.Model(&User{}).Where("id = ?", userId).
-				Update("group", prevGroup).Error; err != nil {
+				Update("group", target).Error; err != nil {
 				return err
 			}
-			cacheGroup = prevGroup
+			cacheGroup = target
 			return nil
 		})
 		if err != nil {
diff --git a/service/billing_session.go b/service/billing_session.go
index 4761f7a1..32344eaf 100644
--- a/service/billing_session.go
+++ b/service/billing_session.go
@@ -425,7 +425,15 @@ func NewBillingSession(c *gin.Context, relayInfo *relaycommon.RelayInfo, preCons
 		session, apiErr := trySubscription()
 		if apiErr != nil {
 			if apiErr.GetErrorCode() == types.ErrorCodeInsufficientUserQuota {
-				return tryWallet()
+				// 仅当用户的活跃订阅允许钱包回退时才回退到钱包，否则返回订阅额度不足错误
+				allowOverflow, overflowErr := model.UserActiveSubscriptionsAllowWalletOverflow(relayInfo.UserId)
+				if overflowErr != nil {
+					return nil, types.NewError(overflowErr, types.ErrorCodeQueryDataError, types.ErrOptionWithSkipRetry())
+				}
+				if allowOverflow {
+					return tryWallet()
+				}
+				return nil, apiErr
 			}
 			return nil, apiErr
 		}
diff --git a/web/default/src/features/subscriptions/components/dialogs/subscription-purchase-dialog.tsx b/web/default/src/features/subscriptions/components/dialogs/subscription-purchase-dialog.tsx
index 04a428d0..cfe4a994 100644
--- a/web/default/src/features/subscriptions/components/dialogs/subscription-purchase-dialog.tsx
+++ b/web/default/src/features/subscriptions/components/dialogs/subscription-purchase-dialog.tsx
@@ -297,7 +297,7 @@ export function SubscriptionPurchaseDialog(props: Props) {
           )}
           <div className='flex items-center justify-between'>
             <span className='text-muted-foreground text-sm'>
-              {t('Received amount')}
+              {t('Plan Quota')}
             </span>
             <span className='flex items-center gap-1 text-sm'>
               <Package className='h-3.5 w-3.5' />
diff --git a/web/default/src/features/subscriptions/components/dialogs/user-subscriptions-dialog.tsx b/web/default/src/features/subscriptions/components/dialogs/user-subscriptions-dialog.tsx
index ea5276fa..e197452d 100644
--- a/web/default/src/features/subscriptions/components/dialogs/user-subscriptions-dialog.tsx
+++ b/web/default/src/features/subscriptions/components/dialogs/user-subscriptions-dialog.tsx
@@ -52,6 +52,7 @@ import {
   invalidateUserSubscription,
   deleteUserSubscription,
 } from '../../api'
+import { formatQuota } from '@/lib/format'
 import { formatTimestamp } from '../../lib'
 import type { PlanRecord, UserSubscriptionRecord } from '../../types'
 
@@ -301,7 +302,9 @@ export function UserSubscriptionsDialog(props: Props) {
                     const sub = record.subscription
                     const total = Number(sub.amount_total || 0)
                     const used = Number(sub.amount_used || 0)
-                    return total > 0 ? `${used}/${total}` : t('Unlimited')
+                    return total > 0
+                      ? `${formatQuota(used)}/${formatQuota(total)}`
+                      : t('Unlimited')
                   },
                 },
                 {
diff --git a/web/default/src/features/subscriptions/components/subscriptions-columns.tsx b/web/default/src/features/subscriptions/components/subscriptions-columns.tsx
index 17bc0872..c4070472 100644
--- a/web/default/src/features/subscriptions/components/subscriptions-columns.tsx
+++ b/web/default/src/features/subscriptions/components/subscriptions-columns.tsx
@@ -160,7 +160,7 @@ export function useSubscriptionsColumns(): ColumnDef<PlanRecord>[] {
       },
       {
         id: 'total_amount',
-        header: t('Received amount'),
+        header: t('Plan Quota'),
         meta: { mobileHidden: true },
         cell: ({ row }) => {
           const total = Number(row.original.plan.total_amount || 0)
diff --git a/web/default/src/features/subscriptions/components/subscriptions-mutate-drawer.tsx b/web/default/src/features/subscriptions/components/subscriptions-mutate-drawer.tsx
index 9882813a..85548f09 100644
--- a/web/default/src/features/subscriptions/components/subscriptions-mutate-drawer.tsx
+++ b/web/default/src/features/subscriptions/components/subscriptions-mutate-drawer.tsx
@@ -66,6 +66,7 @@ import {
   createWaffoPancakeSubscriptionProduct,
   listWaffoPancakeSubscriptionProductOptions,
 } from '../api'
+import { getCurrencyDisplay, getCurrencyLabel } from '@/lib/currency'
 import { getDurationUnitOptions, getResetPeriodOptions } from '../constants'
 import {
   getPlanFormSchema,
@@ -91,6 +92,9 @@ export function SubscriptionsMutateDrawer({
   const { t } = useTranslation()
   const isEdit = !!currentRow?.plan?.id
   const { triggerRefresh } = useSubscriptions()
+  const { meta: currencyMeta } = getCurrencyDisplay()
+  const tokensOnly = currencyMeta.kind === 'tokens'
+  const currencyLabel = getCurrencyLabel()
   const [isSubmitting, setIsSubmitting] = useState(false)
   const [groupOptions, setGroupOptions] = useState<string[]>([])
   const [creatingPancakeProduct, setCreatingPancakeProduct] = useState(false)
@@ -314,7 +318,7 @@ export function SubscriptionsMutateDrawer({
                   name='price_amount'
                   render={({ field }) => (
                     <FormItem>
-                      <FormLabel>{t('Actual Amount')}</FormLabel>
+                      <FormLabel>{t('Plan Price')}</FormLabel>
                       <FormControl>
                         <Input
                           {...field}
@@ -336,12 +340,22 @@ export function SubscriptionsMutateDrawer({
                   name='total_amount'
                   render={({ field }) => (
                     <FormItem>
-                      <FormLabel>{t('Received amount')}</FormLabel>
+                      <FormLabel>
+                        {t('Quota ({{currency}})', { currency: currencyLabel })}
+                      </FormLabel>
                       <FormControl>
                         <Input
                           {...field}
                           type='number'
                           min={0}
+                          step={tokensOnly ? 1 : 0.01}
+                          placeholder={
+                            tokensOnly
+                              ? t('Enter quota in tokens')
+                              : t('Enter quota in {{currency}}', {
+                                  currency: currencyLabel,
+                                })
+                          }
                           onChange={(e) =>
                             field.onChange(parseFloat(e.target.value) || 0)
                           }
@@ -349,7 +363,7 @@ export function SubscriptionsMutateDrawer({
                       </FormControl>
                       <FormDescription>
                         {t(
-                          '0 means unlimited. The value is converted to quota units when saved.'
+                          'Total quota included in the plan, usable per billing period. 0 means unlimited.'
                         )}
                       </FormDescription>
                       <FormMessage />
@@ -398,6 +412,53 @@ export function SubscriptionsMutateDrawer({
                   )}
                 />
 
+                <FormField
+                  control={form.control}
+                  name='downgrade_group'
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel>{t('Downgrade Group')}</FormLabel>
+                      <Select
+                        items={[
+                          {
+                            value: '__none__',
+                            label: t('Downgrade to pre-purchase group'),
+                          },
+                          ...groupOptions.map((g) => ({ value: g, label: g })),
+                        ]}
+                        onValueChange={(v) =>
+                          field.onChange(v === '__none__' ? '' : v)
+                        }
+                        value={field.value || ''}
+                      >
+                        <FormControl>
+                          <SelectTrigger>
+                            <SelectValue
+                              placeholder={t('Downgrade to pre-purchase group')}
+                            />
+                          </SelectTrigger>
+                        </FormControl>
+                        <SelectContent alignItemWithTrigger={false}>
+                          <SelectGroup>
+                            <SelectItem value='__none__'>
+                              {t('Downgrade to pre-purchase group')}
+                            </SelectItem>
+                            {groupOptions.map((g) => (
+                              <SelectItem key={g} value={g}>
+                                {g}
+                              </SelectItem>
+                            ))}
+                          </SelectGroup>
+                        </SelectContent>
+                      </Select>
+                      <FormDescription>
+                        {t('Downgrade to this group after the subscription expires')}
+                      </FormDescription>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+
                 <FormField
                   control={form.control}
                   name='max_purchase_per_user'
@@ -423,27 +484,27 @@ export function SubscriptionsMutateDrawer({
                 />
               </div>
 
-              <div className='grid grid-cols-1 gap-3 sm:grid-cols-2'>
-                <FormField
-                  control={form.control}
-                  name='sort_order'
-                  render={({ field }) => (
-                    <FormItem>
-                      <FormLabel>{t('Sort Order')}</FormLabel>
-                      <FormControl>
-                        <Input
-                          {...field}
-                          type='number'
-                          onChange={(e) =>
-                            field.onChange(parseInt(e.target.value, 10) || 0)
-                          }
-                        />
-                      </FormControl>
-                      <FormMessage />
-                    </FormItem>
-                  )}
-                />
+              <FormField
+                control={form.control}
+                name='sort_order'
+                render={({ field }) => (
+                  <FormItem>
+                    <FormLabel>{t('Sort Order')}</FormLabel>
+                    <FormControl>
+                      <Input
+                        {...field}
+                        type='number'
+                        onChange={(e) =>
+                          field.onChange(parseInt(e.target.value, 10) || 0)
+                        }
+                      />
+                    </FormControl>
+                    <FormMessage />
+                  </FormItem>
+                )}
+              />
 
+              <div className='flex flex-col gap-3'>
                 <FormField
                   control={form.control}
                   name='enabled'
@@ -479,6 +540,24 @@ export function SubscriptionsMutateDrawer({
                     </FormItem>
                   )}
                 />
+
+                <FormField
+                  control={form.control}
+                  name='allow_wallet_overflow'
+                  render={({ field }) => (
+                    <FormItem className={sideDrawerSwitchItemClassName()}>
+                      <FormLabel className='!mt-0'>
+                        {t('Allow wallet balance after quota used up')}
+                      </FormLabel>
+                      <FormControl>
+                        <Switch
+                          checked={field.value}
+                          onCheckedChange={field.onChange}
+                        />
+                      </FormControl>
+                    </FormItem>
+                  )}
+                />
               </div>
             </SideDrawerSection>
 
diff --git a/web/default/src/features/subscriptions/lib/plan-form.ts b/web/default/src/features/subscriptions/lib/plan-form.ts
index f3a4a9dc..381f26bc 100644
--- a/web/default/src/features/subscriptions/lib/plan-form.ts
+++ b/web/default/src/features/subscriptions/lib/plan-form.ts
@@ -40,9 +40,11 @@ export function getPlanFormSchema(t: TFunction) {
     enabled: z.boolean(),
     sort_order: z.coerce.number(),
     allow_balance_pay: z.boolean(),
+    allow_wallet_overflow: z.boolean(),
     max_purchase_per_user: z.coerce.number().min(0),
     total_amount: z.coerce.number().min(0),
     upgrade_group: z.string().optional(),
+    downgrade_group: z.string().optional(),
     stripe_price_id: z.string().optional(),
     creem_product_id: z.string().optional(),
     waffo_pancake_product_id: z.string().optional(),
@@ -63,9 +65,11 @@ export const PLAN_FORM_DEFAULTS: PlanFormValues = {
   enabled: true,
   sort_order: 0,
   allow_balance_pay: true,
+  allow_wallet_overflow: true,
   max_purchase_per_user: 0,
   total_amount: 0,
   upgrade_group: '',
+  downgrade_group: '',
   stripe_price_id: '',
   creem_product_id: '',
   waffo_pancake_product_id: '',
@@ -84,9 +88,11 @@ export function planToFormValues(plan: SubscriptionPlan): PlanFormValues {
     enabled: plan.enabled !== false,
     sort_order: Number(plan.sort_order || 0),
     allow_balance_pay: plan.allow_balance_pay !== false,
+    allow_wallet_overflow: plan.allow_wallet_overflow !== false,
     max_purchase_per_user: Number(plan.max_purchase_per_user || 0),
     total_amount: quotaUnitsToDollars(Number(plan.total_amount || 0)),
     upgrade_group: plan.upgrade_group || '',
+    downgrade_group: plan.downgrade_group || '',
     stripe_price_id: plan.stripe_price_id || '',
     creem_product_id: plan.creem_product_id || '',
     waffo_pancake_product_id: plan.waffo_pancake_product_id || '',
@@ -110,6 +116,7 @@ export function formValuesToPlanPayload(values: PlanFormValues): PlanPayload {
       max_purchase_per_user: Number(values.max_purchase_per_user || 0),
       total_amount: parseQuotaFromDollars(Number(values.total_amount || 0)),
       upgrade_group: values.upgrade_group || '',
+      downgrade_group: values.downgrade_group || '',
     },
   }
 }
diff --git a/web/default/src/features/subscriptions/types.ts b/web/default/src/features/subscriptions/types.ts
index 10768d69..7d32c6c8 100644
--- a/web/default/src/features/subscriptions/types.ts
+++ b/web/default/src/features/subscriptions/types.ts
@@ -36,9 +36,11 @@ export const subscriptionPlanSchema = z.object({
   enabled: z.boolean(),
   sort_order: z.number(),
   allow_balance_pay: z.boolean().optional().default(true),
+  allow_wallet_overflow: z.boolean().optional().default(true),
   max_purchase_per_user: z.number(),
   total_amount: z.number(),
   upgrade_group: z.string().optional(),
+  downgrade_group: z.string().optional(),
   stripe_price_id: z.string().optional(),
   creem_product_id: z.string().optional(),
   waffo_pancake_product_id: z.string().optional(),
diff --git a/web/default/src/i18n/locales/en.json b/web/default/src/i18n/locales/en.json
index c833aca9..a6cc429f 100644
--- a/web/default/src/i18n/locales/en.json
+++ b/web/default/src/i18n/locales/en.json
@@ -138,6 +138,9 @@
     "Active models": "Active models",
     "active users": "active users",
     "Actual Amount": "Actual Amount",
+    "Plan Price": "Plan Price",
+    "Plan Quota": "Plan Quota",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "Total quota included in the plan, usable per billing period. 0 means unlimited.",
     "Actual Model": "Actual Model",
     "Actual Model:": "Actual Model:",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.",
@@ -276,6 +279,10 @@
     "Allocated Memory": "Allocated Memory",
     "Allow accountFilter parameter": "Allow accountFilter parameter",
     "Allow balance redemption": "Allow balance redemption",
+    "Allow wallet balance after quota used up": "Allow wallet balance after quota used up",
+    "Downgrade Group": "Downgrade Group",
+    "Downgrade to pre-purchase group": "Downgrade to pre-purchase group",
+    "Downgrade to this group after the subscription expires": "Downgrade to this group after the subscription expires",
     "Allow Claude beta query passthrough": "Allow Claude beta query passthrough",
     "Allow clients to query configured ratios via `/api/ratio`.": "Allow clients to query configured ratios via `/api/ratio`.",
     "Allow HTTP image requests": "Allow HTTP image requests",
diff --git a/web/default/src/i18n/locales/fr.json b/web/default/src/i18n/locales/fr.json
index 01e5cea2..9decf342 100644
--- a/web/default/src/i18n/locales/fr.json
+++ b/web/default/src/i18n/locales/fr.json
@@ -138,6 +138,9 @@
     "Active models": "Modèles actifs",
     "active users": "utilisateurs actifs",
     "Actual Amount": "Montant réel",
+    "Plan Price": "Prix du forfait",
+    "Plan Quota": "Quota du forfait",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "Quota total inclus dans le forfait, utilisable par période de facturation. 0 signifie illimité.",
     "Actual Model": "Modèle réel",
     "Actual Model:": "Modèle réel :",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "Adapter les requêtes avec le suffixe `-thinking` au comportement de pensée natif d’Anthropic tout en gardant une facturation prévisible.",
@@ -276,6 +279,10 @@
     "Allocated Memory": "Mémoire allouée",
     "Allow accountFilter parameter": "Autoriser le paramètre accountFilter",
     "Allow balance redemption": "Autoriser le paiement avec le solde",
+    "Allow wallet balance after quota used up": "Autoriser le solde du portefeuille une fois le quota épuisé",
+    "Downgrade Group": "Groupe de rétrogradation",
+    "Downgrade to pre-purchase group": "Rétrograder vers le groupe d'avant l'achat",
+    "Downgrade to this group after the subscription expires": "Rétrograder vers ce groupe après l'expiration de l'abonnement",
     "Allow Claude beta query passthrough": "Autoriser le passage des requêtes bêta Claude",
     "Allow clients to query configured ratios via `/api/ratio`.": "Autoriser les clients à interroger les ratios configurés via `/api/ratio`.",
     "Allow HTTP image requests": "Autoriser les requêtes d'images HTTP",
diff --git a/web/default/src/i18n/locales/ja.json b/web/default/src/i18n/locales/ja.json
index 271b758b..fdf17a21 100644
--- a/web/default/src/i18n/locales/ja.json
+++ b/web/default/src/i18n/locales/ja.json
@@ -138,6 +138,9 @@
     "Active models": "アクティブなモデル",
     "active users": "アクティブユーザー",
     "Actual Amount": "実際の金額",
+    "Plan Price": "プラン価格",
+    "Plan Quota": "プランのクォータ",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "プランに含まれる合計クォータ。請求期間ごとに使用可能。0 は無制限を意味します。",
     "Actual Model": "実際のモデル",
     "Actual Model:": "実際のモデル：",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "`-thinking` サフィックス付きリクエストを Anthropic ネイティブの思考動作に適配し、課金を予測可能に保ちます。",
@@ -276,6 +279,10 @@
     "Allocated Memory": "割り当て済みメモリ",
     "Allow accountFilter parameter": "accountFilter パラメータを許可",
     "Allow balance redemption": "残高での交換を許可",
+    "Allow wallet balance after quota used up": "クォータ使い切り後にウォレット残高の使用を許可",
+    "Downgrade Group": "ダウングレードグループ",
+    "Downgrade to pre-purchase group": "購入前のグループにダウングレード",
+    "Downgrade to this group after the subscription expires": "サブスクリプションの有効期限が切れた後、このグループにダウングレードします",
     "Allow Claude beta query passthrough": "Claude ベータクエリのパススルーを許可",
     "Allow clients to query configured ratios via `/api/ratio`.": "クライアントが `/api/ratio` 経由で設定された比率を照会できるようにします。",
     "Allow HTTP image requests": "HTTP画像リクエストを許可",
diff --git a/web/default/src/i18n/locales/ru.json b/web/default/src/i18n/locales/ru.json
index cc814260..53445417 100644
--- a/web/default/src/i18n/locales/ru.json
+++ b/web/default/src/i18n/locales/ru.json
@@ -138,6 +138,9 @@
     "Active models": "Активные модели",
     "active users": "активных пользователей",
     "Actual Amount": "Фактическая сумма",
+    "Plan Price": "Цена тарифа",
+    "Plan Quota": "Квота тарифа",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "Общая квота, включённая в тариф, доступна за каждый расчётный период. 0 означает безлимит.",
     "Actual Model": "Фактическая модель",
     "Actual Model:": "Фактическая модель:",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "Адаптировать запросы с суффиксом `-thinking` к собственному режиму размышления Anthropic, сохраняя предсказуемость биллинга.",
@@ -276,6 +279,10 @@
     "Allocated Memory": "Выделенная память",
     "Allow accountFilter parameter": "Разрешить параметр accountFilter",
     "Allow balance redemption": "Разрешить оплату балансом",
+    "Allow wallet balance after quota used up": "Разрешить использование баланса кошелька после исчерпания квоты",
+    "Downgrade Group": "Понизить группу",
+    "Downgrade to pre-purchase group": "Понизить до группы до покупки",
+    "Downgrade to this group after the subscription expires": "Понизить до этой группы после истечения подписки",
     "Allow Claude beta query passthrough": "Разрешить проброс бета-запросов Claude",
     "Allow clients to query configured ratios via `/api/ratio`.": "Разрешить клиентам запрашивать настроенные соотношения через `/api/ratio`.",
     "Allow HTTP image requests": "Разрешить HTTP-запросы изображений",
diff --git a/web/default/src/i18n/locales/vi.json b/web/default/src/i18n/locales/vi.json
index d61691ee..4569ffa7 100644
--- a/web/default/src/i18n/locales/vi.json
+++ b/web/default/src/i18n/locales/vi.json
@@ -138,6 +138,9 @@
     "Active models": "Mô hình đang hoạt động",
     "active users": "Người dùng tích cực",
     "Actual Amount": "Số tiền thực tế",
+    "Plan Price": "Giá gói",
+    "Plan Quota": "Hạn ngạch gói",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "Tổng hạn ngạch bao gồm trong gói, dùng được mỗi kỳ thanh toán. 0 nghĩa là không giới hạn.",
     "Actual Model": "Mô hình thực tế",
     "Actual Model:": "Mô hình thực tế:",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "Điều chỉnh các yêu cầu có hậu tố `-thinking` sang hành vi suy luận gốc của Anthropic trong khi vẫn giữ tính phí dễ dự đoán.",
@@ -276,6 +279,10 @@
     "Allocated Memory": "Bộ nhớ đã cấp phát",
     "Allow accountFilter parameter": "Cho phép tham số accountFilter",
     "Allow balance redemption": "Cho phép thanh toán bằng số dư",
+    "Allow wallet balance after quota used up": "Cho phép dùng số dư ví sau khi dùng hết hạn ngạch",
+    "Downgrade Group": "Nhóm hạ cấp",
+    "Downgrade to pre-purchase group": "Hạ xuống nhóm trước khi mua",
+    "Downgrade to this group after the subscription expires": "Hạ xuống nhóm này sau khi đăng ký hết hạn",
     "Allow Claude beta query passthrough": "Cho phép chuyển tiếp truy vấn beta Claude",
     "Allow clients to query configured ratios via `/api/ratio`.": "Cho phép khách hàng truy vấn các tỷ lệ đã cấu hình thông qua `/api/ratio`.",
     "Allow HTTP image requests": "Cho phép yêu cầu hình ảnh HTTP",
diff --git a/web/default/src/i18n/locales/zh.json b/web/default/src/i18n/locales/zh.json
index 07f56be3..7c9b5923 100644
--- a/web/default/src/i18n/locales/zh.json
+++ b/web/default/src/i18n/locales/zh.json
@@ -138,6 +138,9 @@
     "Active models": "活跃模型",
     "active users": "活跃用户",
     "Actual Amount": "实付金额",
+    "Plan Price": "套餐价格",
+    "Plan Quota": "套餐额度",
+    "Total quota included in the plan, usable per billing period. 0 means unlimited.": "套餐包含的总额度，每个计费周期可用；0 表示不限量",
     "Actual Model": "实际模型",
     "Actual Model:": "实际模型：",
     "Adapt `-thinking` suffix requests to Anthropic native thinking behavior while keeping billing predictable.": "将带 `-thinking` 后缀的请求适配为 Anthropic 原生思考请求，并保持计费可预测。",
@@ -276,6 +279,10 @@
     "Allocated Memory": "已分配内存",
     "Allow accountFilter parameter": "允许 accountFilter 参数",
     "Allow balance redemption": "允许余额兑换",
+    "Allow wallet balance after quota used up": "额度用尽后允许使用钱包余额",
+    "Downgrade Group": "降级分组",
+    "Downgrade to pre-purchase group": "降级到购买前分组",
+    "Downgrade to this group after the subscription expires": "订阅过期后降级到该分组",
     "Allow Claude beta query passthrough": "允许 Claude beta 查询透传",
     "Allow clients to query configured ratios via `/api/ratio`.": "允许客户端通过 `/api/ratio` 查询配置的比例。",
     "Allow HTTP image requests": "允许 HTTP 图像请求",
diff --git a/web/default/src/i18n/static-keys.ts b/web/default/src/i18n/static-keys.ts
index d3482b43..a9f4b188 100644
--- a/web/default/src/i18n/static-keys.ts
+++ b/web/default/src/i18n/static-keys.ts
@@ -350,6 +350,10 @@ export const STATIC_I18N_KEYS = [
   'Priority',
   'Payment Channel',
   'No Upgrade',
+  'Downgrade to pre-purchase group',
+  'Downgrade Group',
+  'Downgrade to this group after the subscription expires',
+  'Allow wallet balance after quota used up',
   'Unlimited',
   'Update plan info',
   'Create new subscription plan',
@@ -361,6 +365,9 @@ export const STATIC_I18N_KEYS = [
   'Plan Subtitle',
   'e.g. Suitable for light usage',
   'Actual Amount',
+  'Plan Price',
+  'Plan Quota',
+  'Total quota included in the plan, usable per billing period. 0 means unlimited.',
   'Total Quota',
   '0 means unlimited',
   'Sort Order',