add auto-calculation of Itr and Ao form and also back-to dashboard button commit

static/js/ao_calc.js

@@ -0,0 +1,93 @@
+document.addEventListener("DOMContentLoaded", function () {
+
+    // All fields that must trigger calculation
+    const fields = [
+        "gross_total_income", "disallowance_14a", "disallowance_37",
+        "deduction_80ia_business", "deduction_sec37_disallowance", "deduction_80g",
+        "net_taxable_income", "tax_30_percent", "tax_book_profit_18_5",
+        "surcharge_12", "edu_cess_3", "total_tax_payable", "mat_credit",
+        "interest_234c", "total_tax", "advance_tax", "tds", "tcs",
+        "tax_on_assessment", "refund"
+    ];
+
+    function getVal(id) {
+        return parseFloat(document.getElementsByName(id)[0].value) || 0;
+    }
+
+    function setVal(id, value) {
+        document.getElementsByName(id)[0].value = Number(value).toFixed(2);
+    }
+
+    function calculate() {
+
+        // 1️ Base Values
+        let gross_total_income = getVal("gross_total_income");
+        let disallowance_14a = getVal("disallowance_14a");
+        let disallowance_37 = getVal("disallowance_37");
+
+        // 2️ Deductions
+        let d80_business = getVal("deduction_80ia_business");
+        let deduction_sec37 = getVal("deduction_sec37_disallowance");
+        let deduction_80g = getVal("deduction_80g");
+
+        // 3️ Formula: TOTAL DEDUCTION
+        let total_deductions = d80_business + deduction_sec37;
+        // (deduction_80ia_business + deduction_sec37_disallowance)
+
+        // 4️ Net Taxable Income
+        let net_taxable_income =
+            (gross_total_income + disallowance_14a + disallowance_37)
+            - total_deductions
+            - deduction_80g;
+
+        setVal("net_taxable_income", net_taxable_income);
+
+        // 5️ Tax @ 30%
+        let tax_30_percent = net_taxable_income * 0.30;
+        setVal("tax_30_percent", tax_30_percent);
+
+        // 6️ Book Profit – Tax Payable
+        let tax_payable = getVal("tax_book_profit_18_5");
+        // (tax_payable = tax_book_profit_18_5)
+
+        // 7️ Surcharge
+        let surcharge_12 = tax_30_percent * 0.12;
+        setVal("surcharge_12", surcharge_12);
+
+        // 8️ Education Cess
+        let edu_cess_3 = (tax_30_percent + surcharge_12) * 0.03;
+        setVal("edu_cess_3", edu_cess_3);
+
+        // 9️ Total Tax Payable
+        let total_tax_payable = tax_30_percent + surcharge_12 + edu_cess_3;
+        setVal("total_tax_payable", total_tax_payable);
+
+        //  MAT Credit & Interest
+        let mat_credit = getVal("mat_credit");
+        let interest_234c = getVal("interest_234c");
+
+        // 1️1️ Total Tax
+        let total_tax = total_tax_payable + mat_credit + interest_234c;
+        setVal("total_tax", total_tax);
+
+        // 1️2️ Assessment side – Advance Tax, TDS, TCS
+        let advance_tax = getVal("advance_tax");
+        let tds = getVal("tds");
+        let tcs = getVal("tcs");
+
+        let tax_on_assessment = advance_tax + tds + tcs;
+        setVal("tax_on_assessment", tax_on_assessment);
+
+        // 1️3️ Refund / Payable
+        let refund = total_tax - tax_on_assessment;
+        setVal("refund", refund);
+    }
+
+    // Attach input listeners
+    fields.forEach(id => {
+        let input = document.getElementsByName(id)[0];
+        if (input) {
+            input.addEventListener("input", calculate);
+        }
+    });
+});