AtFinance
Free · No sign-up

Reverse GST Calculator

Strip GST out of an inclusive price to see the base value and the tax inside it.

₹11,800

Reverse GST Calculator

Price before GST₹10,000
  • Taxable value₹10,000
  • CGST @ 9%₹900
  • SGST @ 9%₹900
  • Total GST₹1,800
  • Invoice total₹11,800

Base price vs GST

  • Base price ₹10,000
  • GST ₹1,800

How reverse GST works

An MRP or invoice total already contains GST, so you can’t just subtract the rate — ₹11,800 at 18% does not contain ₹2,124 of tax. The base is found by dividing the inclusive amount by (1 + rate): ₹11,800 ÷ 1.18 = ₹10,000, so the GST inside is ₹1,800. This is the calculation businesses use to book expenses, claim input tax credit, and quote pre-tax prices from consumer MRPs.

base = inclusive ÷ (1 + rate ÷ 100); GST = inclusive − base
where rate = GST slab in %; intra-state: the GST splits equally into CGST + SGST

GST inside common inclusive amounts (18%)

At the 18% standard rate, roughly 15.25% of any inclusive price is tax. These are the pre-tax values inside some round inclusive amounts.

Base price inside a GST-inclusive amount at 18%
₹1,000 incl.₹847.46 base
₹11,800 incl.₹10,000 base
₹50,000 incl.₹42,372.88 base
₹1,00,000 incl.₹84,745.76 base

When you need the reverse calculation

Claiming input tax credit from an inclusive bill, comparing a GST-inclusive quote against an exclusive one, filling expense reports where tax must be booked separately, or checking that a seller’s “GST included” price actually works out to the slab they claim — all of these start by backing the tax out. If a claimed split doesn’t match this calculator, the invoice is using a different rate than advertised.

Frequently asked questions

How do I remove GST from a price?

Divide the inclusive amount by 1 plus the rate. For 18%: divide by 1.18. ₹11,800 ÷ 1.18 = ₹10,000 base, so ₹1,800 of the price is GST.

Why can’t I just subtract 18% from the total?

Because the 18% was charged on the smaller base price, not on the final total. Subtracting 18% of the total over-removes tax — on ₹11,800 it would wrongly strip ₹2,124 instead of ₹1,800.

What share of an inclusive price is GST?

At 5% about 4.76% of the price is tax; at 18% about 15.25%; at 40% about 28.57%; at 3% about 2.91%. The calculator shows the exact rupee amount for any figure.

Does MRP in India include GST?

Yes. MRP is the maximum retail price including all taxes, so a shop cannot add GST on top of MRP. Use this calculator to see the pre-tax value inside an MRP.

Related calculators