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India GST Calculator

Work out India's Goods and Services Tax in seconds. Enter a taxable value to add GST, or an inclusive amount to remove GST, and see the CGST, SGST or IGST split exactly as it should appear on an Indian GST invoice.

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Enter the taxable value of goods or services.

GST rate
Tax split

Use CGST + SGST for sales within your state, IGST for inter-state sales.

GST breakdown

Taxable amountCGSTSGST
Taxable amount
₹10,000.00
GST @ 18%
₹1,800.00
CGST(9%)
₹900.00
SGST(9%)
₹900.00
Total amount
₹11,800.00
CGST and SGST are each half of the total GST and are shared between the Centre and your state.

Selling at ₹11,800.00 (incl. GST) on a ₹10,000.00 taxable value means ₹1,800.00 of that is tax, not revenue.

Smart next steps

Formula

Adding GST to a taxable value:

GST = Taxable amount × Rate ÷ 100

Total = Taxable amount + GST

Removing GST from an inclusive amount (reverse GST):

Taxable amount = Inclusive amount ÷ (1 + Rate ÷ 100)

GST = Inclusive amount − Taxable amount

Splitting the tax:

CGST = SGST = GST ÷ 2 (intra-state); IGST = GST (inter-state)

Worked example

Add GST: ₹10,000 at 18%

  • Taxable amount: ₹10,000.00
  • GST at 18%: ₹1,800.00
  • CGST 9%: ₹900.00
  • SGST 9%: ₹900.00
  • Total invoice value: ₹11,800.00

Remove GST: ₹11,800 inclusive of 18%

  • Base amount: ₹10,000.00
  • GST at 18%: ₹1,800.00

How to use this calculator

  1. 1Choose whether the amount you have is before GST (add GST) or already includes GST (remove GST).
  2. 2Enter the amount and pick the slab (0%, 5%, 18% or the 40% special rate) or type a custom rate.
  3. 3Select intra-state to see the CGST and SGST halves, or inter-state to see a single IGST line.
  4. 4Copy the taxable value, tax and total straight into your invoice or quotation.

When businesses use it

  • Quoting a client a price and needing the GST-inclusive figure before you send it.
  • Checking a supplier bill where only the total is printed and you need the tax component for your books.
  • Splitting tax correctly on a same-state sale so your invoice shows CGST and SGST separately.

Understanding GST slabs before you quote

Since the GST 2.0 reform took effect on 22 September 2025, every taxable supply in India sits in one of four rate buckets: nil, 5%, 18% and a 40% special rate, and the slab is decided by the HSN code of the goods or the SAC code of the service, not by how much you charge. Most professional services, software, consultancy and job work fall at 18%, packaged food and everyday essentials sit at 5%, and a narrow set of luxury and sin goods such as aerated drinks and luxury cars carry the 40% special rate. Tobacco and pan masala are the exception. They stay at the older 28% plus compensation cess until that transition is separately notified. Picking the wrong slab is the single most common reason a buyer's input tax credit gets rejected, so confirm the code once and reuse it on every invoice for that item.

The calculator handles both directions because businesses meet GST from two sides. When you are pricing outward supplies you know the taxable value and need to add tax on top. When you are checking a receipt, an MRP or a UPI collection, the tax is already inside the amount and has to be extracted. The maths is not symmetric: 18% added to ₹100 gives ₹118, but removing 18% from ₹118 uses division by 1.18, not an 18% subtraction. Getting this backwards inflates your reported turnover and understates your tax.

Whether the tax splits into CGST plus SGST or stays as a single IGST line depends on the place of supply, which for goods is where delivery ends and for most services is the recipient's registered address. Your own location matters only in relation to that. A Pune business delivering to a Pune buyer charges 9% plus 9%; the same business delivering to Hyderabad charges 18% IGST even if the goods leave the same warehouse.

Mistakes this calculator helps you avoid

  • Treating a GST-inclusive receipt as taxable value, which overstates turnover in GSTR-1.
  • Charging CGST and SGST on an inter-state supply, forcing the buyer to reverse the credit.
  • Rounding tax per line instead of on the invoice total, leaving one-rupee mismatches in returns.
  • Applying the old 28% cess-bearing rate to something that moved to 18% or 40% under the GST 2.0 reform.

GST, VAT and sales tax are not the same

Adding or removing a percentage works the same way for any tax, but the taxes themselves differ in who charges them, on what, and how prices are shown:

  • GST in India is charged at each stage of supply, with credit for tax paid on inputs. Rates come from the HSN or SAC code, and the tax is split into CGST and SGST within a state or charged as IGST between states. This calculator applies those Indian rules.
  • VAT (used across the UK and the EU, among others) works on the same multi-stage, input-credit principle. Consumer prices usually include it. Countries such as Australia, New Zealand, Canada and Singapore call their version GST, but their rates and rules are their own, not India's.
  • Sales tax in the US is set by states and local authorities rather than nationally. It's generally charged once, on the final retail sale, and usually added at checkout on top of the shelf price.

If you're outside India and only need to add a percentage tax to a price, the selling price calculator and discount calculator take any rate you enter, and the international invoice generator supports VAT, GST and sales tax labels in 35 currencies.

GST inclusive vs GST exclusive prices

GST exclusive means the price is quoted before tax, so GST is added on top. When a quotation says "all prices are exclusive of GST", a ₹1,000 line becomes ₹1,180 at 18%. Most business-to-business quotes work this way, because the buyer usually claims the tax back as input credit.

GST inclusive means the tax is already inside the number, so ₹1,180 at 18% is a ₹1,000 taxable value plus ₹180 of GST. Retail price tags, MRP and most consumer receipts are inclusive, because the customer only cares about the final amount payable.

  • Exclusive to inclusive: multiply by 1 + rate ÷ 100. ₹2,500 × 1.18 = ₹2,950.
  • Inclusive to exclusive: divide by 1 + rate ÷ 100. ₹2,950 ÷ 1.18 = ₹2,500.
  • To subtract GST from a total: take the inclusive amount minus the exclusive value above: ₹2,950 − ₹2,500 = ₹450 of GST. Subtracting 18% straight off ₹2,950 gives ₹2,419, which is wrong.

Use Add GST at the top of this page for the exclusive-to-inclusive direction and Remove GST for the reverse. If you only ever work backwards from totals, the dedicated reverse GST calculator is a shorter route, and GST inclusive vs exclusive explained covers how to word your quotes.

GST rates in India

Since the GST 2.0 rate reform took effect on 22 September 2025, most goods and services fall into just two slabs (5% or 18%) with 0% for exempt items and a 40% special rate for luxury and sin goods such as aerated drinks and luxury cars. Tobacco and pan masala remain at the earlier 28% plus compensation cess until that transition is separately notified. The rate depends on the HSN code for goods or the SAC code for services, so confirm your code before invoicing. See GST 2.0: the new GST rates explained for what changed and why.

Tax on ₹1,000 taxable value at each slab, and the intra-state split.
RateGST on ₹1,000CGST + SGSTTotal
0%₹0₹0 + ₹0₹1,000
5%₹50₹25 + ₹25₹1,050
18%₹180₹90 + ₹90₹1,180
40%₹400₹200 + ₹200₹1,400

Which tax applies to your sale

The rate is the same either way; only the presentation changes. Place of supply decides it: the delivery location for goods, and generally the recipient's location for services, with special rules for cases such as immovable property, events and transport.

  • Intra-state: the rate splits equally into CGST and SGST (UTGST in some union territories).
  • Inter-state: the full rate is charged as a single IGST line.
  • Discounts: deduct any invoice discount first, then apply GST to the reduced taxable value.
  • Rounding: invoice totals are usually rounded to the nearest rupee, with the difference shown as a round-off line.

Once you know the profit you want from a taxable sale, pair this with the margin calculator or the profit calculator, then raise the bill in the invoice generator.

Before you charge GST

You can only collect GST once you are registered. Registration thresholds depend on your turnover, state and the nature of your supplies, and composition-scheme dealers follow different rules and issue a bill of supply rather than a tax invoice. Once registered, filing GSTR-1 and GSTR-3B on time matters too: see GST late fees and interest for what a missed deadline actually costs.

GST rates and tax rules may change. Verify the applicable rate before issuing a tax document. This calculator is an arithmetic aid, not tax advice: confirm the rate and treatment for your goods or services with your accountant.

Sources & references

The rules behind this calculator, from the official source. Rates and thresholds change — confirm the current figure on the source itself before relying on it for a filing.

Learn the maths behind it

  • How to calculate GST

    Multiply the taxable value by the GST rate to add tax; divide the inclusive price by 1 + rate/100 to remove it.

  • GST 2.0: the new GST rates explained

    From 22 September 2025, GST runs on four slabs (0%, 5%, 18% and a 40% special rate) with most 12% items moving to 5% and most 28% items moving to 18%.

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Frequently Asked Questions

Multiply the taxable value by 18 and divide by 100. On ₹10,000 the GST is ₹1,800, so the invoice total is ₹11,800. For a sale inside your own state that ₹1,800 is shown as CGST ₹900 plus SGST ₹900.

They are the two halves of the same tax on an intra-state sale. CGST goes to the Central Government and SGST (or UTGST in a union territory) goes to the state where the supply happens. At 18% each is charged at 9%, and together they equal the full GST amount.

Divide the GST-inclusive amount by 1 + rate/100 to get the taxable value, then subtract it to get the tax. For ₹11,800 including 18%: 11,800 ÷ 1.18 = ₹10,000 base and ₹1,800 GST. Switch to Remove GST above and the calculator does this for you.

Integrated GST applies when the supplier and the place of supply are in different states or union territories, and on imports. The full rate goes on a single IGST line instead of being split into CGST and SGST: the Centre later shares it with the destination state.

Yes. The taxable value, GST amount, CGST/SGST or IGST split and total can be copied straight onto an invoice. Make sure you have applied the correct rate for your HSN or SAC code, and confirm anything unusual with your accountant before filing.

A GST-inclusive price already contains the tax, so the figure you see is the final amount payable. A ₹1,180 inclusive price at 18% is made up of a ₹1,000 taxable value plus ₹180 of GST. Nothing more is added at checkout.

A GST-exclusive price is quoted before tax, so GST is added on top. When a quotation says all prices are exclusive of GST, an ₹1,000 line becomes ₹1,180 at 18% once tax is applied. Business-to-business quotes are normally exclusive.

Divide the total by 1 + rate/100: divide by 1.05 for 5%, 1.18 for 18% and 1.40 for the 40% special rate. The result is the taxable value, and the difference between the total and that value is the GST. Never subtract 18% from the total: that under-states the base.

Multiply the exclusive price by 1 + rate/100. At 18%, ₹2,500 exclusive becomes ₹2,500 × 1.18 = ₹2,950 inclusive. Use Add GST above for the exclusive-to-inclusive direction and Remove GST for the reverse.

No. Unregistered suppliers cannot collect GST at all. The threshold is generally ₹40 lakh for goods and ₹20 lakh for services, with lower limits in special category states.

On the value after any discount shown on the face of the invoice. Post-sale discounts only reduce the taxable value if they were agreed before supply and are linked to the original invoice.

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Calculations happen instantly in your browser. Your calculator inputs aren't sent to our servers. KaroDesk provides calculations and information for general informational purposes. Results should be verified against applicable laws, official notifications, employer policies, lender terms, or professional advice where appropriate. Read our full disclaimer.