Invoira
Create invoice

GST calculator

Add GST to a price, or take it out of an amount that already includes it. The result shows the taxable value, the tax and how it is split on the invoice: CGST and SGST within one state, a single IGST line between states.

What is the amount?
Where is the supply?
Taxable value
₹10,000.00
CGST (9%)
₹900.00
SGST (9%)
₹900.00
Total GST
₹1,800.00
Total
₹11,800.00
Start a GST invoice

Opens the editor in rupees with the tax label set. Enter the rate on the line.

How the numbers are worked out

Adding GST: GST = amount × rate ÷ 100, and the total is the amount plus the GST. ₹10,000 at 18% is ₹1,800 of GST and ₹11,800 in all.

Removing GST: taxable value = amount × 100 ÷ (100 + rate), and the GST is what is left. ₹11,800 including 18% is a taxable value of ₹10,000 and ₹1,800 of GST. Taking 18% off ₹11,800 directly gives the wrong answer, which is the most common mistake this calculator avoids.

Amounts are rounded to the paisa once, on the tax. CGST is half the tax rounded to the paisa and SGST is the remainder, so the two lines always add up to the total GST.

CGST and SGST, or IGST

When the supplier and the place of supply are in the same state, the GST is split into two equal halves: an 18% supply shows CGST 9% and SGST 9% (UTGST instead of SGST in a union territory without a legislature). When they are in different states, the whole rate is charged as IGST on one line. The total tax is the same either way.

Since the September 2025 rate changes, most goods and services fall in the 5% or 18% slab, with 40% for a short list of items, and special rates such as 3% for gold. Rates for a particular item can change; check the current rate for yours. This tool does the arithmetic and is not tax advice.

Related