GST Interest Calculator
Calculate interest on late GST payments instantly. Get the exact amount payable when you miss a GST due date.
Enter Details
Net GST amount due (after ITC adjustment)
Original due date for GST payment
Actual or expected payment date
As per Section 50 of CGST Act
Results
Formula
Interest = Tax × 18% × Days / 365
Important Note
Interest is on net tax liability only (post SC ruling). Excess ITC claimed attracts 24% interest.
How to Use This Calculator
Enter Tax Amount
Type the net GST liability amount in Rupees
Select Due Date
Choose the original GST payment deadline
Select Payment Date
Choose actual or expected payment date
Get Interest Amount
View total interest and amount payable
GST Interest Rates in India
As per CGST Act (Updated January 2026)
| Situation | Interest Rate | Section |
|---|---|---|
| Late payment of GST | 18% p.a. | Section 50(1) |
| Excess ITC claimed | 24% p.a. | Section 50(3) |
| Refund delay by govt | 6% p.a. | Section 56 |
Supreme Court Ruling: Interest is payable only on net tax liability (after ITC), not on gross tax. This significantly reduces interest burden for most taxpayers.
Frequently Asked Questions
The interest rate for late GST payment is 18% per annum. Interest is calculated from the day after the due date until the actual payment date. The formula is: Interest = Tax Liability × 18% × Number of Days Late / 365.
GST late payment interest is calculated using the formula: Interest = Tax Amount × 18 × Number of Days / (100 × 365). For example, if you owe Rs. 1,00,000 in GST and pay 30 days late, the interest would be approximately Rs. 1,479.
GST interest starts accruing from the day immediately after the due date of payment. For example, if the due date is 20th of the month and you pay on 25th, interest is charged for 5 days. Interest is on net tax liability only.
Following the Supreme Court ruling, GST interest is charged only on net tax liability (after adjusting Input Tax Credit), not on gross tax. This means you pay interest only on the actual cash amount to be deposited.
If excess Input Tax Credit (ITC) is claimed or wrongly availed, interest at 24% per annum is applicable. This is higher than the standard 18% rate. It's important to verify ITC claims to avoid this higher interest rate.
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