GST Invoice Value Calculator
Add GST to a net price or remove GST from an inclusive total. Instant CGST, SGST and IGST breakup — free, no sign-up, runs entirely in your browser.
Figures rounded to 2 decimals (paise). Verify slab rates against the latest GST Council notifications for filing purposes.
How to calculate GST invoice value
The invoice value of a supply is the net (taxable) amount plus GST. If you know the pre-tax price, multiply it by (1 + rate/100): a ₹10,000 service at 18% GST becomes an invoice value of ₹11,800. If you only know the final inclusive price and need to back out the tax — for example when a vendor quotes "GST included" — divide by the same factor: ₹11,800 ÷ 1.18 = ₹10,000 net, with ₹1,800 of GST.
For supplies within a single state, GST splits equally between CGST and SGST (an 18% slab means 9% + 9%). For inter-state supplies the entire amount is levied as IGST. The buyer's total tax is the same in both cases; only the ledger heads differ.
GST slabs in India (GST 2.0 — effective 22 Sep 2025)
| Rate | Commonly applies to |
|---|---|
| 0% | Fresh food grains, milk, healthcare and education services (exempt/nil-rated) |
| 0.25% / 3% | Rough diamonds; gold, silver and articles of jewellery |
| 5% | Essentials and most mass-consumption goods (the GST 2.0 "merit" slab) |
| 18% | Standard slab — most services and goods (the 12% and 28% slabs were folded into 18% for most items under GST 2.0) |
| 40% | Demerit/luxury goods: tobacco, pan masala, aerated drinks, high-end automobiles |
GST 2.0 (56th GST Council meeting) rationalised the old four-slab structure into two main slabs from 22 September 2025. Some items moved between slabs — always confirm the current HSN/SAC classification for your goods or services.
Frequently asked questions
How do I calculate GST invoice value?
Invoice value = Net amount + GST. For a net amount of ₹1,000 at 18%, GST is ₹180 and invoice value is ₹1,180. Intra-state, that ₹180 splits into CGST ₹90 + SGST ₹90; inter-state it is IGST ₹180.
How do I remove GST from an inclusive price?
Net = Inclusive amount ÷ (1 + rate/100). ₹1,180 inclusive of 18% GST → ₹1,000 net and ₹180 tax. Switch this calculator to "Remove GST" mode to do it in one step.
What is the difference between CGST, SGST and IGST?
Intra-state sales split GST equally into CGST (central) and SGST (state). Inter-state sales charge the full rate as IGST. Total tax for the buyer is identical.
Which GST rate should I use?
Under GST 2.0 (from 22 Sep 2025) the slabs are 0%, 5%, 18% and 40%, plus 0.25%/3% for precious metals. The correct slab follows the HSN/SAC code — 18% covers most services and standard goods.
Is this GST calculator free?
Yes — free, no sign-up, and every calculation runs locally in your browser. Nothing you type is uploaded.