Add GST, or take it out
Type an amount and a rate. We show the taxable value, the CGST and SGST or the IGST, and the invoice total — worked out in your own browser.
GST calculator
Nothing is sent anywhere. This is arithmetic, and it happens on this page.
Two directions, two kinds of supply
Adding GST
You have a price before tax. The calculator works out the GST on it and the total the customer pays.
Taking GST out
You have a price that already includes GST — a shop price, a quoted total. The calculator works backwards to the taxable value and the tax inside it.
Within the state
The tax is split in two equal halves, CGST and SGST (UTGST in a union territory), each at half the rate.
To another state
The whole tax is IGST at the full rate.
Rounding
Everything is worked in paise and rounded to the paisa. Billing software may round per line or to the rupee, so a paisa or two of difference is normal.
The rate is your call, not ours
It does the arithmetic. It does not tell you the rate.
Which rate applies depends on the HSN or SAC code of what you sell, and rates change by notification. A calculator that quietly picks a rate for you is a calculator that will one day be quietly wrong — so this one asks you for it. Confirm the rate with your CA, then use this for the sums.
Frequently asked questions
Is this the amount my invoice should show?
It shows the arithmetic for one amount at one rate. A real invoice may have several lines at different rates and round each line separately, so totals can differ by a paisa or two.
Do you store what I calculate?
No. The calculation happens in your browser; nothing reaches us.
Which rate should I use?
That depends on the HSN or SAC code of the goods or service, and it is a question for your CA. We deliberately do not suggest one.
Can Tally do this for us automatically?
Yes — with the GST details set up correctly on the stock items, ledgers and company, TallyPrime works the tax out on every voucher. Setting that up properly is part of what we do.
Want GST worked out on every invoice?
Set up properly once, TallyPrime calculates the tax on every voucher and keeps it ready for your returns. That setup is work we do every week.