Apply commercial or promotional discounts first, then calculate statutory GST on the discounted taxable amount.
Calculate the final price after applying a discount and then adding GST with this free online tool.
This discount and GST calculator helps you find the final price when you first apply a percentage discount and then add GST to the discounted amount. This is the correct order for most invoice calculations in India: discount first, then tax.
For example, if a product costs 1000 rupees, you offer a 10% discount making it 900 rupees, and then add 18% GST giving a final price of 1062 rupees.
Under GST rules in India, GST is applied on the transaction value after any discount is deducted. If the discount is clearly stated on the invoice, it is not included in the taxable value. So the tax is calculated on the discounted price, not the original price.
This means a 10% discount actually reduces the tax amount too, making discounts more valuable for the buyer.
Enter the original price of the product or service. Enter the discount percentage you want to apply. Then select the applicable GST rate. The calculator shows the discount amount, the discounted price, the GST amount, and the final total.
Use these figures to fill in your invoice correctly.
Retailers running sales, wholesalers offering trade discounts, e-commerce sellers, and any business that gives customers a price reduction before billing GST will benefit from this tool.
It removes manual calculation steps and ensures the tax is computed on the correct post-discount amount.
A discount shown on the invoice is deducted before GST is applied. A discount given after the invoice is raised (like a cash incentive) is treated differently under GST and may require a credit note.
Always show discounts clearly on your invoice to ensure GST is applied only on the taxable value.
Tez Invoice is our free online invoice generator. No sign up. No watermark. Download clean PDF or JPEG invoices in seconds, right from your browser.
Common questions about Discount and GST Calculator: Find Price After Discount and Tax on Tez Invoice.
It is a tool that applies a percentage discount to a price and then calculates GST on the discounted amount, giving you the final invoice total.
Discount is applied first. GST is then calculated on the discounted price. This is the correct order for Indian GST invoices.
Yes. Completely free with no sign up required.
It supports 5%, 12%, 18%, and 28% GST rates.
GST applies on the price after the discount is deducted, as long as the discount is mentioned on the invoice.
Yes. The tool is fully responsive.
No. Calculations happen in your browser only.
Yes. It works for any transaction where you need to apply a discount before calculating GST.
Use the standard GST calculator to add GST first, then manually deduct the discount. However, for invoicing purposes in India, discount before GST is the standard practice.
Use the free Invoice Generator on Tez Invoice to create a complete invoice with discounts and GST breakdowns.