GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services in India. Implemented on July 1, 2017, GST replaced multiple cascading taxes like VAT, service tax, and excise duty with a unified tax structure. India operates a four-tier GST rate system: 5%, 12%, 18%, and 28%, with essential goods taxed at lower rates. As of September 2025 (GST 2.0), the main slabs are 0%, 5%, 18%, and 40%.

To use this GST calculator: (1) Enter the base amount (price before GST) in the input field, (2) Select the applicable GST rate from the dropdown (5%, 18%, or 40%), (3) Choose transaction type - Intra-State (CGST+SGST) or Inter-State (IGST), (4) View instant results showing the GST breakdown and total amount. You can also use the 'Remove GST' tab to calculate base price from GST-inclusive amounts.

The current GST rates effective from September 22, 2025 (GST 2.0) are: 0% (Nil/Exempt) for essentials like fresh fruits, vegetables, milk, education, 33 lifesaving drugs, and individual health insurance; 5% for essential items like hair oil, shampoo, toothpaste, butter, ghee, utensils, and medical equipment; 18% (Standard Rate) for small cars, AC, TV, laptops, cement, most services, and electronics; 40% (Sin/Luxury) for pan masala, tobacco, aerated drinks, large cars, and private aircraft. Special rates include 0.25% for rough diamonds and 3% for gold, silver, and jewellery.

CGST (Central GST) and SGST (State GST) are levied on intra-state transactions (within the same state), with revenue split between Central and State governments. IGST (Integrated GST) applies to inter-state transactions (between different states) and imports, collected by the Central government and distributed to the destination state. For example, a ₹1000 product with 18% GST in an intra-state transaction will have CGST ₹90 + SGST ₹90, while an inter-state transaction will have IGST ₹180.

Use the 'Remove GST' tab when you have a GST-inclusive price and need to find the original base price. This is useful for: (1) Traders who receive GST-inclusive invoices and need to extract the taxable value, (2) Businesses calculating input tax credit from inclusive amounts, (3) Consumers wanting to know the actual product cost before tax, (4) Accountants reconciling GST amounts for returns filing.

Apply CGST+SGST when both the supplier and buyer are located in the same state (Intra-state transaction). Apply IGST when the supplier and buyer are in different states (Inter-state transaction), or for imports/exports. The transaction type determines how the 18% (or other rate) GST is split: Intra-state = CGST 9% + SGST 9%, Inter-state = IGST 18%.

GST is calculated on the base price (price before tax), not on MRP. MRP (Maximum Retail Price) is the final price inclusive of all taxes. When you see an MRP of ₹118 on a product, the base price is ₹100 and GST (18%) is ₹18. This calculator helps you find either the GST-inclusive amount (from base price) or extract the base price from an inclusive amount.

Input Tax Credit (ITC) is the tax credit a registered business can claim for the GST paid on purchases (inputs) used for business purposes. ITC reduces the output tax liability. For example, if you paid ₹18,000 GST on purchases and collected ₹27,000 GST on sales, your net GST payable is ₹9,000 (₹27,000 - ₹18,000). ITC is only available to GST-registered taxpayers with valid tax invoices from active GSTIN holders.

GST rates are revised periodically by the GST Council, typically meeting every 1-2 months. Major revisions occur during Budget sessions and Council meetings. The most significant recent change was GST 2.0 (effective September 22, 2025), which simplified the rate structure from 5 slabs (5%, 12%, 18%, 28%) to 3 main slabs (5%, 18%, 40%). Always check the official GST portal (gst.gov.in) for the latest rates before filing returns.

Late filing of GST returns attracts a late fee of ₹50/day (₹25 CGST + ₹25 SGST) for regular returns (GSTR-3B) and ₹20/day (₹10 CGST + ₹10 SGST) for nil returns, subject to a maximum cap. Additionally, interest at 18% per annum is charged on the outstanding tax amount from the due date until payment. This calculator includes a GST Late Fee Calculator tool for precise penalty calculations.

Yes, GST refunds are available in specific cases: (1) Excess cash balance in electronic cash ledger, (2) Exports without payment of tax, (3) Inverted duty structure (higher tax on inputs than outputs), (4) Tax paid on deemed exports, (5) Refund for international tourists. As of 2025, the average GST refund processing time is 7 days, reduced from 15 days in 2023. File refund applications through the GST portal with proper documentation.

HSN (Harmonized System of Nomenclature) code is an 8-digit international standard for classifying goods under GST. It determines the applicable GST rate for products. Businesses with turnover above ₹5 crore must use 4-digit HSN codes in invoices, while those above ₹1.5 crore use 2-digit codes. Each HSN code is linked to a specific GST rate. Use our HSN Code Finder tool to search over 22,000+ codes with their current GST rates.

This GST calculator provides accurate calculations for standard GST transactions including regular taxable supplies, intra-state and inter-state sales. However, it does not cover: (1) Special category transactions (composition dealers, casual taxable persons), (2) Goods attracting compensation cess (like luxury cars, tobacco), (3) Reverse charge mechanism transactions, (4) E-commerce operator liabilities. For complex scenarios, consult a Chartered Accountant or tax professional.

To claim ITC, you need: (1) Valid tax invoice from a GST-registered supplier, (2) Supplier should have filed GSTR-1 and paid the tax, (3) Goods/services must be received, (4) Invoice should appear in your GSTR-2B, (5) Supplier's GSTIN should be active. Always verify supplier GSTIN using our GST Verification tool before large transactions to ensure ITC eligibility.

GST 2.0 (effective September 22, 2025) simplified the tax structure by: (1) Reducing slabs from 5 to 3 main rates (5%, 18%, 40%), (2) Phasing out the 12% and 28% slabs, (3) Lowering rates on 148 common items (hair oil, shampoo, toothpaste from 18% to 5%), (4) Making individual health insurance tax-free (0%), (5) Reducing cement, AC, TV rates from 28% to 18%. This aims to ease compliance and reduce classification disputes for businesses.