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Worksheet · 03 / GST · FY 2025-26

GST calculator

Add GST to a price or take it out of an inclusive amount, and see the CGST + SGST or IGST split.

Inputs · One line item

Rupees and paise, as on the invoice.

What is this amount?

Up to two decimals (paise).

GST rate

18%: Standard rate for most goods and services. The rate depends on the HSN/SAC code of the item. Check it on cbic-gst.gov.in.

Special rates
Old slabs (pre-22 Sep 2025)
Place of supply

Your GST breakdown

GrowthSense · Estimate

Your invoice prints here

18%

Enter an amount, pick the rate, then press Calculate GST.

  • The GST amount and the total, to the paisa
  • CGST + SGST or IGST, split for you
  • An invoice-style breakdown you can check against a bill

How GST is worked out

Adding GST: GST = taxable value × rate. For an 18% item worth ₹1,000, GST is ₹180 and the invoice total is ₹1,180.

Removing GST: taxable value = inclusive amount ÷ (1 + rate). ₹1,180 including 18% GST is ₹1,000 plus ₹180 GST.

Within a state, the tax is split into equal halves of CGST and SGST (UTGST in union territories). Between states, the whole amount is IGST. The total tax is the same either way, apart from paise-level rounding.

Official sources: cbic-gst.gov.in for rate notifications and gst.gov.in for registration and returns.

Frequently asked questions

When do I charge CGST + SGST and when IGST?

If the supplier and the place of supply are in the same state or union territory, the supply is intra-state and GST is split equally into CGST and SGST (or UTGST). If they are in different states, the supply is inter-state and the full rate is charged as IGST.

How do I remove GST from an amount that already includes it?

Divide the amount by (1 + rate / 100) to get the taxable value. For example, 1,180 including 18% GST is 1,180 / 1.18 = 1,000 taxable value plus 180 GST. Choose "Remove GST" above to do this automatically.

What are the GST rates after 22 September 2025?

After the GST rate rationalisation that took effect on 22 September 2025, most goods and services fall under 5% or 18%, with 40% for certain sin and luxury goods. Special rates such as 0%, 0.25% and 3% continue for specific items. The rate for your item depends on its HSN or SAC code, so check it on cbic-gst.gov.in.

Is this calculator enough to file my GST return?

No. It helps you check invoice figures. Filing GSTR-1 and GSTR-3B needs your full sales, purchases and input tax credit details on gst.gov.in. You can ask for help with registration and returns.

Get this filed for you

Send a message on WhatsApp or call. You will get a clear list of what is needed and a quote before any work starts.

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