Free tool
Discount + GST calculator
Apply a percentage discount to the list price, then add GST to see the taxable value, tax split, and final billable amount.
Discount + GST
Apply a discount, then add GST to get the final billable amount
GST rate
Tax split
Final amount (incl. GST)
₹10,620.00
Bill with line-item discounts automatically
PocketGST applies discounts and GST per line item, splits CGST/SGST or IGST, and generates a compliant invoice PDF — offline.
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How discount and GST work together
Discount applies before GST
Under GST, a trade discount shown on the invoice reduces the taxable value. GST is charged on the price after discount, not before.
Then add GST
Apply the GST rate to the discounted (taxable) value. For intra-state sales it splits into CGST + SGST; for inter-state it is a single IGST.
Worked example
List price ₹10,000, 10% discount → taxable ₹9,000. At 18% GST that is ₹1,620 tax (₹810 + ₹810), so the final amount is ₹10,620.
FAQ
Discount + GST FAQs
Is GST charged before or after discount?+
A trade discount shown on the invoice reduces the taxable value, so GST is charged on the price after discount, not the original list price.
How do I calculate the final price after discount and GST?+
Subtract the discount from the list price to get the taxable value, then add the GST rate. Example: ₹10,000 − 10% = ₹9,000 taxable; at 18% GST the total is ₹10,620.
Are all discounts deductible from the taxable value?+
Discounts recorded on the invoice are deductible. Post-sale discounts must meet specific conditions (such as being linked to an agreement and reversed ITC) to be deducted — verify with your CA.
Does this work for CGST/SGST and IGST?+
Yes. Choose intra-state to split the tax into CGST + SGST, or inter-state to charge a single IGST at the same rate.