How do I remove GST from a total amount?

Divide the inclusive total by 1 plus the rate as a decimal. For a ₹11,800 bill at 18%, divide by 1.18 to get the ₹10,000 base; the difference of ₹1,800 is the GST. For 12% divide by 1.12, for 5% by 1.05 and for 28% by 1.28.

What is the formula for GST exclusive amount?

Exclusive amount = Inclusive amount × 100 ÷ (100 + GST rate). On ₹5,600 at 12%: 5,600 × 100 ÷ 112 = ₹5,000. The tax is the remaining ₹600. The formula works for any rate, including special rates like 3% on gold.

Is MRP inclusive of GST in India?

Yes. Under the Legal Metrology (Packaged Commodities) Rules the printed MRP is the maximum retail price inclusive of all taxes. A retailer cannot add GST on top of MRP. To find the tax inside an MRP of ₹118 at 18%, divide by 1.18: the base is ₹100 and GST is ₹18.

Can I claim input tax credit on an inclusive bill?

Only if the supplier is GST registered and the bill is a proper tax invoice showing their GSTIN, your GSTIN and the tax amount. If the bill shows just an inclusive total, ask for a tax invoice. Reverse calculation helps you check the figures but does not replace the invoice requirement.

Why does 18% of the inclusive price give the wrong tax?

Because the inclusive price already contains the tax, so the rate applies to the smaller base inside it, not to the total. Taking 18% of ₹11,800 gives ₹2,124, but the actual tax was 18% of ₹10,000, which is ₹1,800.

Reverse GST Calculator

Find the pre-GST amount and tax from a GST-inclusive price. Free reverse GST calculator for India.

Free · no login neededMade for India · ₹, GST, UPI, WhatsApp

In short

A reverse GST calculator takes a GST-inclusive price and works backwards to the taxable value and the tax inside it. VyaparKit's reverse GST calculator divides the inclusive amount by (1 + rate ÷ 100), shows the base amount, the CGST and SGST or IGST portion, and lets you copy the breakdown for an invoice or expense claim.

Amount (including GST)

₹

GST rate

Other slabs: 0%, 0.1%, 0.25%, 1%, 1.5%, 3%, 6%, 7.5%

Type of supply

Same state → CGST + SGST. Different state → IGST.

Amount before GST

₹0.00

Inclusive amount₹0.00

CGST @ 9%₹0.00

SGST @ 9%₹0.00

Total GST₹0.00

How is GST calculated?

GST = Amount × Rate ÷ 100. For a sale within the same state the tax is split equally into CGST and SGST. For a sale to another state the whole amount is charged as IGST.

How do I remove GST from an inclusive price?

Base = Inclusive ÷ (1 + Rate ÷ 100). For ₹1,180 at 18%: 1,180 ÷ 1.18 = ₹1,000, so GST is ₹180.

What are the GST slabs in India?

0%, 5%, 12%, 18% and 28% are the main slabs, with special rates of 0.25%, 1.5%, 3% and 6% for items like precious stones, gold and certain services.

Can I use this for invoices?

Yes. VyaparKit's GST invoice tool applies these calculations automatically to every line item, with HSN codes and amount in words.

About the reverse gst calculator tool

Most consumer prices in India are quoted inclusive of GST: the MRP on a packet, a restaurant bill, a hotel tariff or a Swiggy commission statement. When you record those in your books or claim input tax credit you need the taxable value and the tax separately. Reverse GST calculation, also called GST exclusive calculation, finds those two numbers from the inclusive figure.

A common mistake is to take 18% of the inclusive price. On ₹11,800 that gives ₹2,124, which is wrong; the tax inside is ₹1,800. The correct method divides by 1.18 first. People also forget to round the base and the tax so that they add back to the inclusive amount exactly. The reverse GST calculator applies the right formula, rounds to two decimals, and shows the state split so your purchase entry matches the seller's invoice.

If you are recording a supplier's inclusive bill, the purchase bill tool in VyaparKit accepts inclusive prices per line and does the back-calculation for you, updating the vendor ledger and stock at the same time.

How to find the amount before GST from an inclusive price

1
Switch to 'Remove GST'
Tap 'Remove GST' at the top of the calculator. The amount label changes to 'Amount (including GST)'.
2
Type the inclusive price
Enter the full price you paid or quoted, for example 11,800 for a bill that already contains 18% tax.
3
Select the rate that was applied
Choose 5%, 12%, 18% or 28% on the chips, or type another rate in the custom box. The rate must be the one printed on the bill.
4
Choose the supply type
Pick 'Within state' to see CGST and SGST, or 'Other state' to see IGST. This only changes how the tax is labelled, not the amount.
5
Copy the breakdown
The result shows 'Amount before GST', the tax components and total GST. Use 'Copy breakdown' to paste it into your expense sheet or accounting entry.

The formula, with a worked example

Base amount = Inclusive amount ÷ (1 + Rate ÷ 100). For ₹11,800 at 18%: 11,800 ÷ 1.18 = ₹10,000.
GST amount = Inclusive amount − Base amount. ₹11,800 − ₹10,000 = ₹1,800.
Shortcut for the tax alone: Inclusive × Rate ÷ (100 + Rate). 11,800 × 18 ÷ 118 = ₹1,800.
At 12%: ₹5,600 ÷ 1.12 = ₹5,000 base and ₹600 tax. At 28%: ₹2,560 ÷ 1.28 = ₹2,000 base and ₹560 tax. At 5%: ₹1,050 ÷ 1.05 = ₹1,000 base and ₹50 tax.
Within the same state the ₹1,800 tax on ₹11,800 is shown as CGST ₹900 and SGST ₹900; to another state it is IGST ₹1,800.
Never take the rate directly on the inclusive figure. 18% of ₹11,800 is ₹2,124, which overstates the tax by ₹324.
Round the base to two decimals and derive tax as inclusive minus base, so the two parts always add back to the exact inclusive amount.
MRP under the Legal Metrology rules is always inclusive of all taxes, so retail MRPs should be reverse-calculated, never grossed up again.

Who uses the reverse gst calculator

Restaurants and cafes

Menu prices are inclusive of 5% GST. A cafe owner in Bengaluru splits the day's ₹42,000 collection into ₹40,000 taxable and ₹2,000 tax for the GSTR-3B.

Online sellers on Amazon and Flipkart

Marketplace listings show inclusive prices. Sellers back-calculate the taxable value per SKU to set margins and check settlement reports.

Employees filing expense claims

A sales executive claiming a ₹3,540 hotel bill enters the inclusive amount and reports the ₹3,000 base and ₹540 GST the finance team needs for credit.

Bookkeepers entering purchase bills

Supplier invoices from small shops often show only the total. The bookkeeper reverse-calculates the base to post the tax to the input credit ledger.