Online GST Calculator India

To add GST to a base amount (Exclusive GST): multiply the net base amount by the GST rate percentage and add the tax to the base amount. To remove GST from a total bill (Inclusive GST): divide the total bill by (100 + GST rate) and multiply by 100 to extract the net base amount.

CGST (Central GST) and SGST (State GST) apply to intra-state transactions (sales within the same state) and are shared equally (50-50%) between the Central and State governments. IGST (Integrated GST) applies to inter-state transactions (sales between two different states) and imports, collected entirely by the Central Government.

The primary GST tax rate slabs in India are 0% (exempted basic food and services), 5% (essential commodities), 12% (standard processed items), 18% (most services and manufactured items), and 28% (demerit and luxury goods). Special rates like 3% apply to gold/jewelry and 0.25% to unpolished stones.

To calculate Reverse GST, switch to the 'Remove GST (Inclusive)' mode on our calculator. Enter your total bill amount and select the tax slab. The calculator automatically applies the formula: Net Base Amount = Gross Total × (100 / (100 + GST Rate)), isolating the net price from the tax paid.

Businesses selling goods with an aggregate annual turnover exceeding ₹40 Lakhs (₹20 Lakhs for special category northeastern states) and service providers with turnover exceeding ₹20 Lakhs (₹10 Lakhs for special category states) must mandatorily register under GST law.

Input Tax Credit (ITC) allows registered businesses to deduct the tax paid on raw materials, stock, office overheads, and commercial purchases from the tax collected on outward sales. This prevents tax-on-tax compounding and reduces net tax payable.

The Composition Scheme is a simplified tax option for small traders, manufacturers, and restaurants with turnover up to ₹1.5 Crore. Taxpayers under this scheme pay tax at a lower flat rate (1% for traders/manufacturers, 5% for restaurants) quarterly without issuing detailed GST tax invoices.

Yes! Click the 'Enter Custom Rate (%)' button in our calculator to input any custom tax rate (e.g. 3% for gold, 0.25% for rough diamonds, or 7.5% for specific work contracts). The calculator computes CGST, SGST, and IGST breakdowns instantaneously.