GST Calculator - 無料オンライン電卓

1. 1

   Enter the amount you want to calculate GST on.

2. 2

   Choose the mode: 'Add GST' (when the entered amount is GST-exclusive) or 'Remove GST' (when the entered amount already includes GST).

3. 3

   Pick a GST slab (5%, 12%, 18%, 28%) or enter a custom rate.

4. 4

   View the net amount, GST amount, and gross amount immediately.

5. 5

   Use the breakdown to see CGST and SGST contributions for intra-state transactions, or IGST for inter-state.

6. 6

   Copy the values directly into your invoice, quotation, or accounting software - the splits are exactly what GST returns expect.

GST is a destination-based, value-added indirect tax. Each business in a supply chain charges GST on its sales, claims input tax credit (ITC) on the GST it paid on its purchases, and remits the net to the government. The total GST is split into CGST and SGST (each at half the total rate) for intra-state transactions, or charged as a single IGST for inter-state ones. Imports attract IGST plus customs duty.

• Freelancers and consultants invoicing clients use the 'add GST' mode to attach 18% GST cleanly to their professional fees and present a tax invoice that the client can claim as input tax credit.
• Retail buyers checking whether a quoted price is inclusive or exclusive of GST. The 'remove GST' mode reveals the base price quickly and helps spot vendors quoting GST as an additional surprise.
• Small businesses under the Composition Scheme using the calculator with custom 1%, 5% or 6% rates to compute their flat-rate liability - no input tax credit, but simpler returns.
• Accountants reconciling sales registers with GST returns at month-end. Plugging gross sales numbers in 'remove GST' mode produces the net sales and tax components to enter in GSTR-1 or GSTR-3B.

• Confusing 'inclusive' and 'exclusive' rates. 'Price ₹1,000 + 18% GST' produces ₹1,180. 'Price ₹1,000 inclusive of 18% GST' produces ₹847.46 net + ₹152.54 GST. Always confirm which is meant before computing.
• Forgetting that some categories attract a compensation cess on top of 28% GST - typically tobacco, large luxury cars and aerated drinks. The calculator handles GST only; cess must be added separately.
• Using IGST instead of CGST/SGST for an intra-state sale. The math is the same, but the GST return goes to the wrong head and you lose the input tax credit on either side.
• Charging GST on an exempt service (healthcare, education) or zero-rated supply (exports). Always check the latest exemption list before invoicing.
• Forgetting reverse charge. For specified categories like legal services, GST is paid by the recipient under reverse charge - you don't add GST on the invoice, the buyer self-reports.

• Always show net amount, GST rate, GST amount and gross amount as separate line items on your invoice. It avoids disputes and makes ITC reconciliation straightforward for your customers.
• Cross-check HSN/SAC codes regularly - the GST council updates rate notifications and a 12% item can move to 18% or vice versa. Each invoice has to use the rate effective on the date of supply.
• If you're under Composition Scheme, you can't charge GST to your customers nor claim ITC. Quote tax-inclusive prices and budget the 1%/5%/6% as a cost, not a pass-through.
• For inter-state freelancing or consulting, you must register for GST regardless of turnover - the ₹20-lakh threshold applies only to intra-state services.
• Use the calculator's CGST/SGST split when raising intra-state invoices in QuickBooks, Tally or Zoho Books - those systems expect the components separately, not just the total.