diff --git a/src/controllers/05-quotation-controller.ts b/src/controllers/05-quotation-controller.ts
index 65b36ec..b7bf25c 100644
--- a/src/controllers/05-quotation-controller.ts
+++ b/src/controllers/05-quotation-controller.ts
@@ -390,7 +390,9 @@ export class QuotationController extends Controller {
           a.totalPrice = precisionRound(a.totalPrice + c.pricePerUnit * c.amount);
           a.totalDiscount = precisionRound(a.totalDiscount + c.discount);
           a.vat = precisionRound(a.vat + c.vat);
-          a.finalPrice = precisionRound(a.totalPrice - a.totalDiscount + a.vat);
+          a.finalPrice = precisionRound(
+            Math.max(a.totalPrice - a.totalDiscount + a.vat - (body.discount || 0), 0),
+          );
 
           return a;
         },
@@ -399,7 +401,7 @@ export class QuotationController extends Controller {
           totalDiscount: 0,
           vat: 0,
           discount: body.discount,
-          finalPrice: -(body.discount || 0),
+          finalPrice: 0,
         },
       );
 
@@ -611,7 +613,9 @@ export class QuotationController extends Controller {
           a.totalPrice = precisionRound(a.totalPrice + c.pricePerUnit * c.amount);
           a.totalDiscount = precisionRound(a.totalDiscount + c.discount);
           a.vat = precisionRound(a.vat + c.vat);
-          a.finalPrice = precisionRound(a.totalPrice - a.totalDiscount + a.vat);
+          a.finalPrice = precisionRound(
+            Math.max(a.totalPrice - a.totalDiscount + a.vat - (body.discount || 0), 0),
+          );
 
           return a;
         },
@@ -620,7 +624,7 @@ export class QuotationController extends Controller {
           totalDiscount: 0,
           vat: 0,
           discount: body.discount,
-          finalPrice: -(body.discount || 0),
+          finalPrice: 0,
         },
       );