diff --git a/frontend/src/BillingManager.jsx b/frontend/src/BillingManager.jsx
index 0e44e10..204986e 100644
--- a/frontend/src/BillingManager.jsx
+++ b/frontend/src/BillingManager.jsx
@@ -295,6 +295,14 @@ function BillingManager() {
     return Math.ceil((nextPayment - now) / (1000 * 60 * 60 * 24));
   };
 
+  // Добавить 1 месяц к дате (для обновления nextPaymentDate после платежа)
+  const addMonthToDate = (dateString) => {
+    if (!dateString) return '';
+    const d = new Date(dateString);
+    d.setMonth(d.getMonth() + 1);
+    return d.toISOString().slice(0, 10);
+  };
+
   // Форматирование
   function formatDate(dateString) {
     if (!dateString) return '—';
@@ -459,12 +467,14 @@ function BillingManager() {
       const payments = [...(s.payments || [])];
       payments.splice(index, 1);
       const last = payments.slice().sort((a,b) => new Date(b.date) - new Date(a.date))[0];
+      const nextPaymentDate = addMonthToDate(last?.date);
       return {
         ...s,
         payments,
         lastPaymentDate: last?.date || '',
         lastPaymentAmount: last?.amount || 0,
-        lastPaymentCurrency: last?.currency || 'USD'
+        lastPaymentCurrency: last?.currency || 'USD',
+        nextPaymentDate: nextPaymentDate || s.nextPaymentDate
       };
     }));
     setShowDeletePaymentModal(false);
@@ -1081,7 +1091,8 @@ function BillingManager() {
                 note: paymentDraft.note || ''
               };
               const last = payments.slice().sort((a,b) => new Date(b.date) - new Date(a.date))[0];
-              return { ...s, payments, lastPaymentDate: last?.date || '', lastPaymentAmount: last?.amount || 0, lastPaymentCurrency: last?.currency || 'USD' };
+              const nextPaymentDate = addMonthToDate(last?.date);
+              return { ...s, payments, lastPaymentDate: last?.date || '', lastPaymentAmount: last?.amount || 0, lastPaymentCurrency: last?.currency || 'USD', nextPaymentDate: nextPaymentDate || s.nextPaymentDate };
             }));
             setEditingPayment(null);
           } else {
@@ -1094,7 +1105,8 @@ function BillingManager() {
                 note: paymentDraft.note || '' 
               }];
               const last = payments.slice().sort((a,b) => new Date(b.date) - new Date(a.date))[0];
-              return { ...s, payments, lastPaymentDate: last?.date || '', lastPaymentAmount: last?.amount || 0, lastPaymentCurrency: last?.currency || 'USD' };
+              const nextPaymentDate = addMonthToDate(last?.date);
+              return { ...s, payments, lastPaymentDate: last?.date || '', lastPaymentAmount: last?.amount || 0, lastPaymentCurrency: last?.currency || 'USD', nextPaymentDate: nextPaymentDate || s.nextPaymentDate };
             }));
           }
           setShowPaymentModal(false);