GST Exclusive Calculator: Build an Invoice Total with GST

When your price list is quoted without GST, you need to add the tax at invoice time. Enter the unit price, quantity, any discount and the GST rate to get the taxable value, the GST and the final invoice total.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
₹
%
%
Current main slabs are 0%, 5%, 18% and 40%. Check the rate for your item or service.
Your resultLive

Estimates for general information. This is not tax or accounting advice.

More Business & GST calculators

View all 10
GST CalculatorGST Inclusive CalculatorProfit CalculatorProfit Margin CalculatorMarkup CalculatorDiscount CalculatorSelling Price CalculatorBreak-Even CalculatorWholesale Price Calculator

You may also need

From related categories
EMI CalculatorFinance & MoneyAmazon Seller Profit CalculatorEcommercePercentage CalculatorMathCompound Interest CalculatorFinance & MoneyFlipkart Seller Profit CalculatorEcommerceFraction CalculatorMath

How to use this calculator

  1. Enter the price of one unit before GST.
  2. Enter the quantity.
  3. Enter a discount if you give one. It is applied before GST.
  4. Enter the GST rate.
  5. Read the taxable value, GST and invoice total.

The formula

Taxable value = Unit price × Quantity × (1 − Discount ÷ 100). GST = Taxable value × Rate ÷ 100. Invoice total = Taxable value + GST.

Worked example

40 units at ₹250 with a 10% discount: ₹10,000 becomes a taxable value of ₹9,000. At 5% GST the tax is ₹450, so the invoice total is ₹9,450, or ₹236.25 per unit including GST.

Understanding your result

Discounts given on the invoice reduce the taxable value, so GST is charged on the discounted amount. A discount given later, without being shown on the original invoice, may be treated differently, so check the rules with your accountant.

When to use it

  • Prepare invoices for wholesale and trade orders.
  • Quote a customer a total with tax shown separately.
  • Check a supplier invoice total.

Assumptions and limits

Assumes one GST rate for the whole amount. Cess, rounding rules on invoices, input tax credit and composition scheme rules are not included. GST rates are set by the GST Council and can change, so confirm the rate for your product or service (HSN or SAC code) before invoicing. This is not tax advice.

Frequently asked questions

What does GST exclusive mean?

The quoted price does not include GST. Tax is added on top.

Is the discount applied before or after GST?

Before. GST is charged on the discounted taxable value.

How do I find GST per unit?

Divide the GST amount by the quantity.

Which rate should I use for food items?

It depends on the product and its HSN code. Many packaged foods are at 5%, but check the notification for your item.

Can I leave the discount empty?

Yes. It is treated as 0%.