GST Calculator + Guide

Calculate GST and bill correctly.

Use the calculator for quick tax split, then follow the practical guide before sharing invoices for filing.

GST Calculator

Amount GST Rate

Supply type

CGST + SGST vs IGSTSeller state and place of supply decide the split. Same state means CGST + SGST. Different state means IGST.

Tax invoice vs bill of supplyGST registered sellers issue tax invoices when GST is charged. Unregistered/composition sellers usually use bill of supply.

HSN/SAC disciplineUse HSN for goods and SAC for services. Keep common codes saved for repeat items to reduce filing-time corrections.

Registered buyer checkIf buyer provides GSTIN, capture GSTIN and place of supply carefully. Wrong GSTIN can create return matching issues.

UPI and bank detailsShow UPI QR plus bank details clearly. Match payable amount with invoice total before sending PDF.

Before filingReview invoice number series, dates, taxable values, GST rates, HSN/SAC and customer GSTIN before GSTR work.

Quick invoice checklist

Seller name, address, GSTIN and state are correct.
Invoice number is unique and follows the business series.
Buyer GSTIN is entered only when actually available.
Place of supply matches the tax treatment.
Each line item has HSN/SAC, quantity, unit, rate and GST rate.
Total, UPI QR amount and bank/payment details match.