diff --git a/src/services/flowaccount.ts b/src/services/flowaccount.ts
index df40d27..0c46f50 100644
--- a/src/services/flowaccount.ts
+++ b/src/services/flowaccount.ts
@@ -289,13 +289,55 @@ const flowAccount = {
 
     const quotation = data.quotation;
     const customer = quotation.customerBranch;
-    const product =
+
+    const summary = {
+      subTotal: 0,
+      discountAmount: 0,
+      vatableAmount: 0,
+      exemptAmount: 0,
+      vatAmount: 0,
+      grandTotal: 0,
+    };
+
+    const products = (
       quotation.payCondition === PayCondition.BillFull ||
       quotation.payCondition === PayCondition.Full
         ? quotation.productServiceList
         : quotation.productServiceList.filter((lhs) =>
             data.installments.some((rhs) => rhs.no === lhs.installmentNo),
-          );
+          )
+    ).map((v) => {
+      // TODO: Use product's VAT field (not implemented) instead.
+      const VAT_RATE = VAT_DEFAULT;
+
+      summary.subTotal +=
+        precisionRound(v.pricePerUnit * (1 + (v.vat > 0 ? VAT_RATE : 0))) * v.amount;
+      summary.discountAmount += v.discount;
+
+      const total =
+        precisionRound(v.pricePerUnit * (1 + (v.vat > 0 ? VAT_RATE : 0))) * v.amount -
+        (v.discount ?? 0);
+
+      if (v.vat > 0) {
+        summary.vatableAmount += precisionRound(total / (1 + VAT_RATE));
+        summary.vatAmount += v.vat;
+      } else {
+        summary.exemptAmount += total;
+      }
+
+      summary.grandTotal += total;
+
+      return {
+        type: ProductAndServiceType.ProductNonInv,
+        name: v.product.name,
+        pricePerUnit: precisionRound(v.pricePerUnit),
+        quantity: v.amount,
+        discountAmount: v.discount,
+        vatRate: v.vat === 0 ? 0 : Math.round(VAT_RATE * 100),
+        total,
+      };
+    });
+
     const payload = {
       contactCode: customer.code,
       contactName: customer.contactName || "-",
@@ -333,45 +375,12 @@ const flowAccount = {
       discounPercentage: 0,
       discountAmount: quotation.totalDiscount,
 
-      subTotal:
-        quotation.payCondition === "BillSplitCustom" ||
-        quotation.payCondition === "BillSplit" ||
-        quotation.payCondition === "SplitCustom" ||
-        quotation.payCondition === "Split"
-          ? 0
-          : quotation.totalPrice,
-      vatableAmount:
-        quotation.payCondition === "BillSplitCustom" ||
-        quotation.payCondition === "BillSplit" ||
-        quotation.payCondition === "SplitCustom" ||
-        quotation.payCondition === "Split"
-          ? 0
-          : quotation.totalPrice - quotation.totalDiscount - quotation.vatExcluded,
-      exemptAmount:
-        quotation.payCondition === "BillSplitCustom" ||
-        quotation.payCondition === "BillSplit" ||
-        quotation.payCondition === "SplitCustom" ||
-        quotation.payCondition === "Split"
-          ? 0
-          : quotation.vatExcluded,
-      totalAfterDiscount:
-        quotation.payCondition === "BillSplitCustom" ||
-        quotation.payCondition === "BillSplit" ||
-        quotation.payCondition === "SplitCustom" ||
-        quotation.payCondition === "Split"
-          ? 0
-          : quotation.finalPrice,
-      vatAmount:
-        quotation.payCondition === "BillSplitCustom" ||
-        quotation.payCondition === "BillSplit" ||
-        quotation.payCondition === "SplitCustom" ||
-        quotation.payCondition === "Split"
-          ? 0
-          : quotation.vat,
-      grandTotal:
-        quotation.payCondition === "BillSplitCustom" || quotation.payCondition === "SplitCustom"
-          ? data.installments.reduce((a, c) => a + c.amount, 0)
-          : quotation.finalPrice,
+      subTotal: summary.subTotal,
+      totalAfterDiscount: summary.subTotal - summary.discountAmount,
+      vatableAmount: summary.vatableAmount,
+      exemptAmount: summary.exemptAmount,
+      vatAmount: summary.vatAmount,
+      grandTotal: summary.grandTotal,
 
       remarks: htmlToText(
         convertTemplate(quotation.remark ?? "", {
@@ -389,17 +398,7 @@ const flowAccount = {
           },
         }),
       ),
-      items: product.map((v) => ({
-        type: ProductAndServiceType.ProductNonInv,
-        name: v.product.name,
-        pricePerUnit: precisionRound(v.pricePerUnit),
-        quantity: v.amount,
-        discountAmount: v.discount,
-        total:
-          precisionRound(v.pricePerUnit * (1 + (v.vat > 0 ? VAT_DEFAULT : 0))) * v.amount -
-          (v.discount ?? 0),
-        vatRate: v.vat === 0 ? 0 : Math.round(VAT_DEFAULT * 100),
-      })),
+      items: products,
     };
 
     return await flowAccountAPI.createReceipt(payload, false);