GST Calculator & Tax Breakdown Studio

The GST Calculator computes Indian Goods and Services Tax (GST) for retail billing, commercial invoicing, and accounting reconciliation. Whether you are a business owner generating sales invoices or a consumer verifying tax line items on a retail receipt, calculating exact tax amounts and reverse-calculating base prices is essential.

This tool supports both **GST Exclusive** (adding tax onto a base price) and **GST Inclusive** (reverse-calculating the pre-tax base price from a gross total). It breaks down tax liabilities into Central GST (CGST), State GST (SGST), and Integrated GST (IGST) according to Indian tax laws, running completely in your browser.

• •**GST Exclusive Formula (Adding Tax)**: - `GST Amount = (Base Amount × GST Rate) / 100` - `Gross Invoice Total = Base Amount + GST Amount` - *Example*: A ₹10,000 IT consulting invoice at 18% GST yields ₹1,800 GST (₹900 CGST + ₹900 SGST) for a total of ₹11,800.
• •**GST Inclusive Formula (Reverse Calculation)**: - `Base Pre-Tax Price = (Gross Amount × 100) / (100 + GST Rate)` - `GST Amount = Gross Amount - Base Pre-Tax Price` - *Example*: An electronic gadget sold for ₹59,000 inclusive of 18% GST has a base price of `(59,000 × 100) / 118 = ₹50,000`, and a tax component of ₹9,000.
• •**Statutory Rounding Rules (Section 170 of CGST Act)**: Indian tax regulations dictate that final tax amounts should be rounded to the nearest whole rupee (fractions of 50 paise or more rounded up, less than 50 paise ignored). The calculator applies strict statutory rounding conventions.

• •**Vendor Invoicing & Quotes**: Drafting formal B2B sales invoices with accurate CGST/SGST/IGST splits before sending them to clients.
• •**Retail Point of Sale Billing**: Calculating gross totals for retail customers at cash counters and generating compliant bill summaries.
• •**Expense Claim Audits**: Reverse-calculating base expenses and recoverable Input Tax Credit (ITC) from hotel bills, flight tickets, and office supply receipts.
• •**Tax Filing Reconciliation**: Cross-checking total collected tax against monthly GSTR-1 and GSTR-3B ledger totals.

• •**Discrepancy between CGST and SGST**: In intra-state sales, CGST and SGST must always be split exactly 50/50. If your tax slab is 18%, CGST is 9% and SGST is 9%.
• •**Choosing between IGST and CGST/SGST**: If the seller's state and buyer's state GSTIN codes are identical, use CGST + SGST. If they are in different states (e.g., Maharashtra to Karnataka), select IGST.
• •**Cess on luxury items**: Certain luxury and demerit goods (automobiles, tobacco, aerated beverages) carry an additional Compensation Cess over and above the 28% GST slab. Use the Custom Rate field to add applicable cess percentages.