GST Calculator India — Add or Remove GST Instantly
Working with GST-inclusive or exclusive prices? Enter any amount, pick the GST slab and choose whether to add GST on top or strip it out — the tax breakup appears instantly.
Total price (incl. GST)
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GST amount
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Base price (excl. GST)
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Price breakup
Base price vs GST (split into CGST + SGST).
How GST calculations work
In India, GST is charged as a percentage of the pre-tax price. It works in two directions:
- Add GST: GST = amount × rate ÷ 100, and total = amount + GST.
- Remove GST: base = amount ÷ (1 + rate ÷ 100), and GST = amount − base.
Worked examples
Adding 18% GST to ₹1,000: GST = 1,000 × 18 ÷ 100 = ₹180, so the total becomes ₹1,180.
Removing 18% GST from ₹1,180 (say, an MRP that already includes tax): base = 1,180 ÷ 1.18 = ₹1,000, and the GST hidden inside is ₹180. A common mistake is to subtract 18% of ₹1,180 (₹212.40). That gives the wrong base price, because the 18% applies to the pre-tax amount — not the inclusive one. This split matters for businesses filing GSTR returns: you report the base value and the tax separately, and claim input credit only on the GST portion.
India-specific notes
- Know your slab. The main slabs are 0%, 5%, 12%, 18% and 28%, with special rates like 3% on gold and 0.25% on rough precious stones. Most everyday goods and services sit at 5%, 12% or 18%. Check the HSN/SAC code if you are unsure.
- CGST + SGST vs IGST. Within a state, 18% GST splits into 9% CGST + 9% SGST; between states it becomes a single 18% IGST. You pay the same total either way.
- MRP always includes GST. Indian law requires printed MRPs to include all taxes, so use “Remove GST” mode to work out the pre-tax price of packaged goods.
- Input tax credit. GST-registered businesses can set off the GST paid on purchases against the GST collected on sales. If you run a business, always show the GST part separately on invoices — this calculator's breakup helps with that.
- Composition scheme. Small businesses under the composition scheme pay GST at lower flat rates, but they cannot claim input tax credit and cannot charge GST separately on their invoices.
GST Calculator FAQs
What are the GST slabs in India?
The main GST slabs are 0%, 5%, 12%, 18% and 28%, with special rates like 3% on gold and 0.25% on rough precious stones. Most goods and services fall under 5%, 12% or 18%.
How do I remove GST from a price?
Divide the GST-inclusive price by (1 + rate/100). Say the 18% GST-inclusive price is ₹1,180: 1,180 ÷ 1.18 = ₹1,000 base price, and the GST hidden inside is ₹180. This calculator's “Remove GST” mode does the maths instantly.
Is GST included in the MRP?
Yes. Under Indian law, the MRP printed on packaged goods must include all taxes, GST included. So when you see an MRP, use the “Remove GST” mode to find the pre-tax price.
What is the difference between CGST, SGST and IGST?
For sales within a state, GST splits equally into CGST (centre) + SGST (state) — so 18% becomes 9% + 9%. For inter-state sales, it is charged as a single IGST (18%). The total tax is the same either way.
Can businesses claim back the GST they pay?
Yes, through input tax credit (ITC). A GST-registered business can set off the GST it paid on purchases against the GST it collects on sales, so tax is effectively paid only on the value it adds. That is why businesses track GST separately.
Do I need to add GST on top of my service invoice?
If you are GST-registered and your service attracts GST (most services are 18%), yes. You charge GST on top of your base price and pay it to the government, while claiming input credit on your own business purchases.