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GST Calculator

Work out 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 your 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 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.

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%, 12%, 18% or 28% — 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

Every taxable supply in India sits in one of five rate buckets — nil, 5%, 12%, 18% and 28% — 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 essentials sit at 5%, and a narrow set of goods such as aerated drinks and tobacco carry 28% plus cess. 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 a cess-bearing 28% rate without adding the compensation cess separately.

GST rates in India

Most goods and services fall into the 5%, 12%, 18% or 28% slabs, with 0% for exempt items. The rate depends on the HSN code for goods or the SAC code for services, so confirm your code before invoicing.

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
12%₹120₹60 + ₹60₹1,120
18%₹180₹90 + ₹90₹1,180
28%₹280₹140 + ₹140₹1,280

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.

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.

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.

  • How to create a GST invoice

    A tax invoice needs your GSTIN, a consecutive number, the customer details, HSN/SAC, taxable value and the GST split.

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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.