Include manual tax accounts in VAT evaluation

frontend/composables/useTaxEvaluation.ts

@@ -166,3 +166,33 @@ export const getIncomingInvoiceTaxBreakdown = (invoice: any) => {
         net0: Number(breakdown.net0.toFixed(2)),
     }
 }
+
+const getSkr03AccountNumber = (account: any) => {
+    if (!account || String(account.accountChart || "").toLowerCase() !== "skr03") return null
+    return String(account.number || "")
+}
+
+export const getManualBookingTaxBreakdown = (booking: any) => {
+    const amount = Number(booking?.amount || 0)
+    const breakdown = { outputTax19: 0, inputTax19: 0 }
+
+    if (!Number.isFinite(amount) || amount === 0) return breakdown
+
+    const applySide = (account: any, side: "debit" | "credit") => {
+        const accountNumber = getSkr03AccountNumber(account)
+
+        if (accountNumber === "1576") {
+            breakdown.inputTax19 += side === "debit" ? amount : -amount
+        } else if (accountNumber === "1776") {
+            breakdown.outputTax19 += side === "credit" ? amount : -amount
+        }
+    }
+
+    applySide(booking.account, "debit")
+    applySide(booking.contraAccount, "credit")
+
+    return {
+        outputTax19: Number(breakdown.outputTax19.toFixed(2)),
+        inputTax19: Number(breakdown.inputTax19.toFixed(2)),
+    }
+}