GST calculator

GST Calculator, a full invoice, not just one number.

Add as many line items as you need, price them inclusive or exclusive of tax, and get the exact CGST/SGST or IGST split, cess, round-off and rate-wise summary. Free, instant, no sign-up.

Multi-item invoicesCGST/SGST or IGSTCess, RCM, TDS & TCS
Amount you enter is
Place of supply
Item 1
Taxable ₹10,000Tax ₹1,800Line total ₹11,800
Advanced options
Gross value₹10,000
Taxable value₹10,000
CGST₹900
SGST / UTGST₹900
Total tax₹1,800
Invoice total₹11,800

Intra-state supplies split into CGST and SGST; inter-state supplies carry a single IGST at the same total rate. Your rate depends on the classification of what you sell, look it up in the HSN / SAC finder. Indicative only, confirm with an Expert before you file.

Built like a real tax invoice.

Most calculators handle one amount at one rate. This one handles a whole invoice: several items on different slabs, discounts, compensation cess, reverse charge and the deductions that decide what actually lands in your bank.

Every notified slab is available, from 0.1% for merchant exports to 28%. Your rate depends on the HSN/SAC of what you sell.
When to use it

Where a GST calculator helps.

Raising invoicesBuild the whole bill, several items on different slabs, and get a tax line that ties out to the rupee.
Checking a billBack out the GST hidden inside an inclusive price or MRP to verify what you were charged.
Quoting clientsShow a clean pre-tax and post-tax figure instantly when pricing a deal.
Reconciling returnsThe rate-wise summary mirrors the table GSTR-1 asks for, so you can sanity-check before you file.
Selling onlineSee what the marketplace deducts as 0.5% TCS and what actually reaches your account.
Government contractsModel the 2% GST TDS a department or PSU withholds from your payment.
Cars, tobacco, aerated drinksAdd compensation cess on top of the 28% slab and see the real landed price.
Reverse-charge suppliesBill the taxable value only and see the tax the recipient has to pay direct.
The service behind it

Calculating GST is step one. Filing it is the job.

This calculator gives you the right numbers for a single transaction. But staying compliant means doing it for every invoice, reconciling input credit, and filing GSTR-1 and GSTR-3B on time, month after month.

Our GST Return Filing service does exactly that, your dedicated Expert prepares, reconciles and files your returns so you never miss a deadline or a credit.

  • Monthly GSTR-1 & GSTR-3B prepared and filed
  • Input tax credit reconciled against your purchases
  • Notices and mismatches handled for you

GST Return Filing

Done-for-you monthly filing by a real Expert, from a fixed monthly fee.

How it works

Enter the invoice, read the tax.

1
Set the two switches. Tell it whether your prices already include tax, and whether the supply is intra-state (CGST + SGST) or inter-state (IGST).
2
Fill in the line. Quantity, unit price, GST slab, plus optional description, HSN/SAC, discount and compensation cess.
3
Add more items if the invoice has them. Each line can sit on a different slab and the totals keep up as you type.
4
Open advanced options for reverse charge, GST TDS @ 2%, e-commerce TCS @ 0.5%, flat-rupee discounts and invoice round-off.
5
Read the breakdown, then copy it to your clipboard for the invoice, the quote or your accountant.
The method

How GST is calculated.

The formulas behind the numbers

Line value
Gross = Qty × Unit price · Taxable = Gross − Discount
Exclusive pricing
GST = Taxable × rate ÷ 100 · Cess = Taxable × cess ÷ 100
Inclusive pricing
Taxable = Amount ÷ (1 + (rate + cess) ÷ 100)
Intra-state split
CGST = SGST = GST ÷ 2
Inter-state
IGST = full GST at the same combined rate
Invoice total
Taxable + GST + Cess, rounded to the nearest rupee (section 170)
Reverse charge
You bill Taxable only; the recipient pays GST + Cess direct
Deductions
TDS = Taxable × 2% · TCS = Taxable × 0.5% · both on value, never on tax
Worked examples

See it in action.

Exclusive
₹10,000 base value at 18% GST, within the state
  • Taxable value₹10,000
  • GST @ 18%₹1,800
  • CGST 9% + SGST 9%₹900 + ₹900
Invoice total: ₹11,800
Inclusive
₹11,800 all-in price at 18% GST
  • Amount (incl.)₹11,800
  • Taxable value₹10,000
  • GST component₹1,800
Taxable value: ₹10,000
Cess
A ₹8,00,000 car at 28% GST plus 17% cess
  • Taxable value₹8,00,000
  • GST @ 28%₹2,24,000
  • Cess @ 17%₹1,36,000
On-road tax component: ₹3,60,000
E-commerce
₹50,000 of sales through a marketplace at 18%
  • Invoice total₹59,000
  • Less TCS @ 0.5% of value₹250
  • Credited to you₹58,750
TCS of ₹250 shows up in your cash ledger
FAQs

GST calculator questions

What’s the difference between CGST, SGST and IGST?

For a sale within the same state, GST is split equally into CGST (central) and SGST (state). For inter-state sales, a single IGST is charged at the full rate instead. Switch “Place of supply” to see either split, the total tax is identical.

Which GST rate should I use?

The rate depends on the HSN (goods) or SAC (services) classification of what you sell, commonly 5%, 12%, 18% or 28%. The calculator also carries the special rates: 0.1% for merchant exports, 0.25% for rough diamonds, 1% and 5% for real estate, 3% for gold. Use our HSN/SAC finder to look yours up.

Is GST calculated on the MRP?

MRP is already inclusive of GST. Set “Amount you enter is” to Incl. GST and the calculator backs out the taxable value and the tax component hidden inside it.

What is compensation cess and when does it apply?

Cess is an extra levy on top of GST on demerit and luxury goods: cars, tobacco, pan masala and aerated drinks. Rates run from 1% to 22% and higher on tobacco. Enter it per line and it is calculated on the taxable value, not on the GST.

How do discounts affect GST?

A discount shown on the face of the invoice reduces the taxable value, so tax is charged on the net amount. Post-sale discounts only reduce it if they were agreed before the supply and are linked to the invoice. Enter yours as a percentage, or switch to flat rupees in advanced options.

What is reverse charge (RCM)?

On certain supplies, including goods transport, legal services and purchases from unregistered dealers, the recipient pays the GST instead of the supplier. Turn on RCM and the invoice bills the taxable value only, with the tax shown separately as the recipient’s liability.

Why does my invoice total get rounded?

Section 170 of the CGST Act rounds the tax and the total to the nearest rupee. The calculator shows the round-off as its own line so your invoice ties out exactly. Turn it off in advanced options if you need the paise.

What are GST TDS and TCS?

Government departments and PSUs deduct 2% TDS under section 51 on contracts above ₹2.5 lakh. E-commerce operators collect 0.5% TCS under section 52 on your net taxable sales — halved from 1% by Notification 15/2024-Central Tax with effect from 10 July 2024. Both are computed on the taxable value, not on the tax, and both land in your electronic cash ledger to offset later liability.

Do I need a GSTIN to charge GST?

Yes. You must be registered and have a GSTIN to legally collect GST. If your turnover crosses the threshold, talk to us about GST registration.

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