diff --git a/backend/benefit/calculator/api/v1/serializers.py b/backend/benefit/calculator/api/v1/serializers.py
index 0f6a13c076..d09cc4a544 100644
--- a/backend/benefit/calculator/api/v1/serializers.py
+++ b/backend/benefit/calculator/api/v1/serializers.py
@@ -1,6 +1,7 @@
 from typing import Union
 
 from dateutil.relativedelta import relativedelta
+from django.conf import settings
 from django.utils.translation import gettext_lazy as _
 from rest_framework import serializers
 
@@ -116,6 +117,7 @@ class CalculationSerializer(serializers.ModelSerializer):
         max_digits=Calculation.override_monthly_benefit_amount.field.max_digits,
         decimal_places=Calculation.override_monthly_benefit_amount.field.decimal_places,
         min_value=0,
+        max_value=settings.SALARY_BENEFIT_NEW_MAX,
         help_text="manually override the monthly benefit amount",
     )
 
diff --git a/backend/benefit/calculator/tests/test_calculator_api.py b/backend/benefit/calculator/tests/test_calculator_api.py
index 07438d3039..d3ec9342b0 100644
--- a/backend/benefit/calculator/tests/test_calculator_api.py
+++ b/backend/benefit/calculator/tests/test_calculator_api.py
@@ -766,3 +766,23 @@ def test_application_calculation_instalments(
         due_date = instalment_2.due_date
         future_date = timezone.now() + timedelta(days=181)
         assert due_date == future_date.date()
+
+def test_override_monthly_benefit_amount_max_validation(
+    handler_api_client, handling_application
+):
+    """Test that override_monthly_benefit_amount cannot exceed 1500€"""
+    data = HandlerApplicationSerializer(handling_application).data
+    data["calculation"]["start_date"] = str(handling_application.start_date)
+    data["calculation"]["end_date"] = str(handling_application.end_date)
+    data["calculation"]["override_monthly_benefit_amount"] = "1600.00"
+    data["calculation"]["override_monthly_benefit_amount_comment"] = (
+        "Trying to exceed maximum"
+    )
+
+    response = handler_api_client.put(
+        get_handler_detail_url(handling_application),
+        data,
+    )
+    assert response.status_code == 400
+    assert "calculation" in response.data
+    assert "override_monthly_benefit_amount" in response.data["calculation"]
diff --git a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/utils/validation.ts b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/utils/validation.ts
index 2fab10fbb2..455d2fa476 100644
--- a/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/utils/validation.ts
+++ b/frontend/benefit/handler/src/components/applicationReview/salaryBenefitCalculatorView/utils/validation.ts
@@ -49,7 +49,7 @@ export const getManualValidationSchema = (
 ): Yup.SchemaOf<CalculationCommon> =>
   getValidationSchema(t).shape({
     [CALCULATION_SALARY_KEYS.OVERRIDE_MONTHLY_BENEFIT_AMOUNT]:
-      validateNumberField(0, 800, {
+      validateNumberField(0, 1500, {
         required: t(VALIDATION_MESSAGE_KEYS.REQUIRED),
         typeError: t(VALIDATION_MESSAGE_KEYS.NUMBER_INVALID),
       }),