Calculate 18% per annum interest on delayed GST payment under Section 50 of CGST Act. Enter your tax amount, due date, and payment date — get instant results.
Under Section 50 of CGST Act, if you pay GST late, you must pay interest at 18% per annum. Interest is calculated from the due date to actual payment date.
GST law mandates 18% per annum interest on delayed payment under Section 50 of CGST Act. This rate applies to CGST, SGST, and IGST.
Interest is calculated from the due date (usually 20th of next month for GSTR-3B) to the actual payment date. Even 1 day delay attracts interest.
Simple Interest: Interest = (Tax Amount Rate Days) / (365 100)
| Tax Amount | Days Late | Interest @ 18% |
|---|---|---|
| ₹10,000 | 10 days | ₹49 |
| ₹50,000 | 30 days | ₹739 |
| ₹1,00,000 | 60 days | ₹2,959 |
| ₹5,00,000 | 90 days | ₹22,192 |
If you file GSTR-3B after the due date (20th of next month for monthly filers), interest at 18% p.a. applies on the net cash tax paid for each day of delay.
If you claimed excess Input Tax Credit and utilised it, interest at 24% per annum applies under Section 50(3) of CGST Act — higher than the standard 18% rate.
When ITC is reversed (e.g., for non-payment to supplier within 180 days, or ineligible ITC), interest at 18% applies from the date of original ITC claim to the date of reversal.
If GST is unpaid due to genuine error (Section 73) or fraud (Section 74), interest is part of the demand along with tax and penalty. It continues to accrue until the full amount is deposited.
| Situation | Interest Rate | Section |
|---|---|---|
| Late payment of GST (GSTR-3B) | 18% per annum | Section 50(1) CGST Act |
| Excess ITC claimed and utilised | 24% per annum | Section 50(3) CGST Act |
| ITC reversal (180 days non-payment) | 18% per annum | Rule 37 CGST Rules |
| Refund wrongly received | 24% per annum | Section 54(12) CGST Act |
💡 Interest is automatically calculated on GST portal when you file returns
💰 You must pay interest along with delayed tax
📅 Interest applies from due date, not filing date
🔄 For multiple months delay, interest compounds monthly
Interest is NOT tax deductible as business expense