GST Calculator
Calculate GST at primary 5%/18% slabs (plus 40% demerit and custom rates). Add or extract GST from inclusive and exclusive prices.
Last updated: 6 August 2026. GST rates are set by the GST Council — confirm applicable rate for your HSN/SAC on cbic.gov.in.
What is GST?
Goods and Services Tax (GST) is India's unified indirect tax on supply of goods and services, effective from 1 July 2017. It subsumed many earlier taxes and is levied at point of supply with input tax credit mechanism for registered businesses.
How GST is calculated
Tax-exclusive price: GST amount = Taxable value × (GST% ÷ 100). Total = Taxable value + GST.
Tax-inclusive price: Taxable value = Total ÷ (1 + GST% ÷ 100). GST = Total − Taxable value.
Worked example: ₹10,000 + 18% GST → tax ₹1,800, invoice total ₹11,800. Reverse: ₹11,800 inclusive → base ₹10,000.
GST rate slabs (indicative)
After the September 2025 GST reform, the primary structure centres on 5% and 18%, with a 40% demerit rate for specified luxury/sin goods. A custom rate field remains available. Legacy 12% and 28% may still appear on some goods temporarily during transition. Nil-rated and exempt supplies exist; compensation cess can be added where applicable. Verify current HSN/SAC schedules on cbic.gov.in.
CGST, SGST and IGST
Intra-state sales: GST splits equally into Central GST (CGST) and State GST (SGST). Inter-state sales: Integrated GST (IGST) applies. Choose supply type in the calculator to see the split; total GST is CGST+SGST or IGST at the same combined rate.
GST vs income tax vs TDS
| Feature | GST | Income tax | TDS |
|---|---|---|---|
| Type of tax | Indirect tax on supply of goods/services | Direct tax on income | Withholding of tax at source on payments |
| Who pays | Supplier collects from customer; remits to government | Assessee on total taxable income | Deductor pays on behalf of payee |
| Typical slabs | Primary 5% / 18% (+ 40% demerit); custom & legacy 12/28 may still appear | Slab rates per regime | Section-specific rates and thresholds |
Who should use a GST calculator?
Consumers verifying restaurant or retail bills, freelancers quoting tax-inclusive fees, and small businesses preparing quick invoices before filing GSTR returns.
Frequently asked questions about GST
How do I calculate GST on an exclusive price?
Multiply the taxable value by the GST rate and divide by 100. Example: ₹10,000 at 18% → GST ₹1,800, total ₹11,800. Select 'Excl. GST' in the calculator.
How do I find the base amount from a GST-inclusive bill?
Divide the total by (1 + rate/100). Example: ₹1,180 inclusive at 18% → base ₹1,000, GST ₹180. Select 'Incl. GST' in the calculator.
What are the main GST rate slabs in India?
After the September 2025 GST reform, the primary structure centres on 5% and 18%, with a 40% demerit rate for specified luxury/sin goods. A custom rate field remains available for other notified rates. Legacy 12% and 28% slabs may still appear on some goods temporarily during transition — verify current HSN/SAC notifications on cbic.gov.in.
Is GST the same as VAT?
GST replaced many indirect taxes including VAT, excise and service tax from July 2017. It is a dual GST with central and state components (CGST+SGST intra-state, IGST inter-state).
Does this calculator include IGST, CGST and SGST split?
Yes. Choose intra-state to split GST equally into CGST and SGST, or inter-state for full IGST. Total GST is the same either way at the rate you enter.
What about compensation cess?
Certain luxury and demerit goods may attract compensation cess or the higher demerit GST rate on top of or instead of standard slabs. Enter a cess % or custom rate to see the combined invoice total.
What is GSTIN?
Goods and Services Tax Identification Number — a 15-digit registration for businesses above threshold turnover. B2B invoices require valid GSTIN for input tax credit.
Can I claim input tax credit (ITC)?
Registered businesses can offset GST paid on purchases against GST collected on sales, subject to conditions in the CGST Act. This calculator does not model ITC.
Is GST applicable on gold jewellery?
GST applies on gold jewellery making charges and on supply of gold at rates notified under GST law (verify current rate on CBIC portal). Metal rate pages on Nelstack show indicative bullion prices excluding GST.
What is reverse charge mechanism (RCM)?
In specified cases the recipient, not the supplier, pays GST. RCM does not change the arithmetic of rate × value but affects who files the return.
Is this calculator for businesses or consumers?
Both. Consumers can check tax on bills; businesses can quickly compute tax-exclusive or tax-inclusive amounts. Always verify HSN/SAC and rate notifications for compliance.
How to calculate GST on ₹25,000 bill at 18% inclusive vs exclusive in India?
Exclusive: GST = 25,000 × 18%; total = base + GST. Inclusive: base = total ÷ 1.18, GST = total − base. Switch Incl./Excl. mode in the calculator to match your invoice.
GST calculator for freelancers — CGST SGST or IGST for client in another state?
Intra-state supply typically splits into CGST+SGST; inter-state uses IGST on the same rate. Choose the correct place-of-supply treatment for your invoice — this tool only splits the tax arithmetically.
Disclaimer: Does not determine correct rate for your product. Consult a chartered accountant for compliance. Not tax advice.
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