diff --git a/apps/web/config/default-values.ts b/apps/web/config/default-values.ts
index d29e818..e457cd3 100644
--- a/apps/web/config/default-values.ts
+++ b/apps/web/config/default-values.ts
@@ -40,7 +40,7 @@ const defaultValues: CalculationValues = {
   engineVolume: 0,
   finDepartmentRewardCondtion: null,
   finDepartmentRewardSumm: 0,
-  firstPaymentPerc: 25,
+  firstPaymentPerc: 0,
   firstPaymentRub: 0,
   fuelCard: null,
   fullPriceWithDiscount: false,
@@ -113,7 +113,7 @@ const defaultValues: CalculationValues = {
   quoteUrl: null,
   rate: null,
   recalcWithRevision: false,
-  redemptionPaymentSum: 1_000,
+  redemptionPaymentSum: 1000,
   regionRegistration: null,
   registration: null,
   registrationDescription: '-',
diff --git a/apps/web/process/price/reactions/common.ts b/apps/web/process/price/reactions/common.ts
index 03f5f21..4a25ed7 100644
--- a/apps/web/process/price/reactions/common.ts
+++ b/apps/web/process/price/reactions/common.ts
@@ -3,9 +3,11 @@ import { VAT } from '@/constants/values';
 import * as CRMTypes from '@/graphql/crm.types';
 import type { ReactionsContext } from '@/process/types';
 import { autorun, reaction } from 'mobx';
+import { pick } from 'radash';
+import { makeDisposable } from 'tools';
 
 export default function commonReactions({ store, apolloClient }: ReactionsContext) {
-  const { $calculation } = store;
+  const { $calculation, $process } = store;
 
   reaction(
     () => $calculation.element('radioLastPaymentRule').getValue(),
@@ -88,4 +90,32 @@ export default function commonReactions({ store, apolloClient }: ReactionsContex
       $calculation.element('tbxVATInLeaseObjectPrice').setValue(priceVAT);
     }
   });
+
+  reaction(
+    () =>
+      pick($calculation.$values.values, [
+        'firstPaymentPerc',
+        'addEquipmentPrice',
+        'importProgramSum',
+        'plPriceRub',
+      ]),
+    ({ firstPaymentPerc, addEquipmentPrice, importProgramSum, plPriceRub }) => {
+      const rub = (firstPaymentPerc * (plPriceRub + addEquipmentPrice - importProgramSum)) / 100;
+      $calculation.element('tbxFirstPaymentRub').setValue(rub);
+    }
+  );
+
+  makeDisposable(
+    () =>
+      reaction(
+        () => pick($calculation.$values.values, ['firstPaymentRub']),
+        ({ firstPaymentRub }) => {
+          const { plPriceRub, addEquipmentPrice, importProgramSum } = $calculation.$values.values;
+          const perc =
+            (firstPaymentRub / (plPriceRub + addEquipmentPrice - importProgramSum)) * 100;
+          $calculation.element('tbxFirstPaymentPerc').setValue(perc);
+        }
+      ),
+    () => $process.has('LoadKP')
+  );
 }