Frequently Asked Questions

GST (Goods and Services Tax) is a comprehensive indirect tax on the supply of goods and services in India. Introduced on July 1, 2017, it replaced multiple cascading taxes like VAT, service tax, and excise duty with a single unified tax.

There are three types of GST: CGST (Central GST) collected by the Central Government, SGST (State GST) collected by State Governments, and IGST (Integrated GST) collected on inter-state transactions. CGST and SGST apply to intra-state sales, while IGST applies to inter-state sales.

India has four primary GST slabs: 5%, 12%, 18%, and 28%. Additionally, some goods are exempt (0%), and precious metals like gold attract 3% GST. Certain luxury and demerit goods may also attract an additional cess.

Businesses with an annual turnover exceeding ₹40 lakh (₹20 lakh for special category states) must register for GST. Additionally, certain categories like inter-state suppliers, e-commerce operators, and casual taxable persons must register regardless of turnover.

To add GST: GST Amount = Base Amount × (GST Rate / 100). Total = Base Amount + GST Amount. Example: ₹1,000 at 18% GST → GST = ₹180, Total = ₹1,180.

To remove GST: Base Amount = Total ÷ (1 + GST Rate/100). Example: ₹1,180 at 18% GST → Base = 1180 ÷ 1.18 = ₹1,000.

For intra-state transactions, the total GST is split equally into CGST and SGST. For example, if the GST rate is 18%, CGST = 9% and SGST = 9%. Both are applied on the base amount.

IGST is charged on inter-state transactions — when the seller and buyer are in different states. For imports, IGST is also applicable. The full GST rate is charged as IGST (e.g., 18% IGST instead of 9% CGST + 9% SGST).

Yes, our GST calculator is completely free. You can perform unlimited calculations, generate invoices, and download PDFs without any charges or registration.

Our calculator uses precise mathematical formulas and rounds to 2 decimal places, ensuring accuracy matching official GST calculations. It correctly handles all rate slabs and CGST/SGST/IGST split.

Yes! All calculations are automatically saved in your browser's local storage. Click the "History" button in the calculator to view, reload, or delete past calculations.

Yes! Our Invoice Generator lets you create professional GST-compliant invoices with buyer/seller details, GSTIN, itemized billing, complete tax breakdown, and PDF download.

ITC allows businesses to claim credit for GST paid on purchases (inputs) against the GST collected on sales (output). This prevents cascading taxes and reduces the effective tax burden.

The composition scheme is for small businesses with turnover up to ₹1.5 crore. They pay GST at a fixed rate (1-6%) without input tax credit. It simplifies compliance with quarterly returns instead of monthly.

Under RCM, the recipient pays GST instead of the supplier. This applies to specific goods/services notified by the government, such as services from unregistered suppliers or certain imports.

GSTIN is a 15-digit Goods and Services Tax Identification Number assigned to every registered taxpayer. Format: First 2 digits = state code, next 10 = PAN, 13th = entity number, 14th = Z (default), 15th = checksum.