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Calculate interest on late GST payment at 18% p.a. or on excess ITC at 24% p.a. under Section 50 of the CGST Act. Get exact day-wise interest breakdown.
Interest on tax paid after the due date
Original payment due date
Actual / expected payment date
| Scenario | Rate | Section |
|---|---|---|
| Late payment of tax | 18% p.a. | Section 50(1) |
| Excess ITC claimed & utilized | 24% p.a. | Section 50(3) |
| Wrongful refund obtained | 24% p.a. | Section 50(3) |
| Tax collected but not paid | 24% p.a. | Section 50(1) |
| Undue ITC (reversed later) | 18% p.a. | Section 50(1) |
Interest is calculated on a simple interest basis, from the day after the due date until the date of actual payment.
If you've ever filed your GST return a few days late, you've probably noticed an interest amount pop up on the portal. That's Section 50 of the CGST Act doing its thing. It's the government's way of charging you for the time value of money — if you owed tax and didn't pay on time, you pay interest on the delay.
There are two interest rates under GST, and which one applies depends on what went wrong:
This is the standard rate. It kicks in when you file your return after the due date and have a net tax liability. For example, your GSTR-3B for October was due on 20th November, but you filed on 15th December. You'll pay 18% per annum on your net tax liability for those 25 days of delay.
An important change came in 2022 — interest is now calculated on the net tax liability (after adjusting ITC available in your electronic credit ledger), not the gross liability. This was a massive relief because earlier, even if you had enough ITC balance, the interest was charged on the full tax amount before adjustment.
This higher rate is essentially a penalty-grade interest. It applies when you claim Input Tax Credit that you weren't entitled to and actually use it to pay off your tax liability. Think of it as the government saying, "You took money that wasn't yours and used it — so you pay extra."
The same 24% rate applies when you obtain a refund that you shouldn't have received. In both cases, the interest runs from the date the wrong credit was utilized or the refund was received until the date you pay back the amount.
Interest = Tax Amount × (Interest Rate / 100) × (Number of Days / 365)GST interest is always calculated on a simple interest basis — there's no compounding. The number of days starts from the day after the due date and runs up to and including the date of actual payment.
Let's say you have a net tax liability of ₹2,00,000 for the GSTR-3B of September 2024. The due date was 20th October 2024, but you actually paid on 19th November 2024 — that's 30 days late.
Interest = ₹2,00,000 × 18% × 30/365
Interest = ₹2,00,000 × 0.18 × 0.08219
Interest = ₹2,959So you'd pay ₹2,00,000 as tax plus ₹2,959 as interest — a total of ₹2,02,959. Not a huge amount for one month, but imagine if you're consistently late across all months — it adds up quickly.
Suppose you claimed ₹5,00,000 in excess ITC in April 2024 and used it to pay your tax liability. The department discovered this in September 2024 (150 days later). You reverse the credit and pay cash.
Interest = ₹5,00,000 × 24% × 150/365
Interest = ₹5,00,000 × 0.24 × 0.41096
Interest = ₹49,315That's nearly ₹50,000 in interest on a ₹5 lakh excess claim. This is why it's critical to claim only eligible ITC — the 24% rate really bites.
Interest under Section 50 isn't just about filing late. Here are the most common scenarios where Indian businesses end up paying interest:
The most common trigger. Your GSTR-3B is due on the 20th of the following month (for monthly filers) or the 22nd/24th for QRMP scheme quarterly filers. If you file late and have a net tax liability after adjusting your ITC, 18% interest applies from day one after the due date.
Sometimes businesses pay less tax than what's actually due — maybe because of a calculation error or a missed invoice. In that case, interest at 18% is charged on the shortfall amount from the original due date until you file the corrected payment through DRC-03 or in the next return period.
If you claimed more ITC in GSTR-3B than what shows up in your GSTR-2B auto-drafted statement, and you've already used that excess ITC to pay tax, the 24% rate applies on the excess amount. This is one of the riskiest areas for businesses that don't reconcile their ITC monthly.
If you got a GST refund (say, for exports or inverted duty structure) and the department later finds you weren't entitled to it, they'll recover the refund amount plus 24% interest from the date the refund was credited to your bank account.
When you receive a demand order after a Section 73 or Section 74 proceeding, the order typically includes interest at 18% (or 24% in fraud cases) calculated from the date the tax was originally due until the date of the order or payment — whichever is earlier.
Before the 2022 retrospective amendment (effective from 1st July 2017), there was a massive confusion about whether interest should be calculated on the gross tax or net tax (after ITC adjustment). The Telangana High Court in Megha Engineeringruled that interest should be on net liability, but many officers still raised demands on gross.
The amendment settled this once and for all. Section 50(1) now clearly states that interest is payable on the portion of tax paid by debiting the electronic cash ledger. In plain English: if you had ₹10 lakh tax liability and ₹7 lakh ITC, interest applies only on the ₹3 lakh cash component — not the full ₹10 lakh.
This is a huge relief, especially for businesses with high ITC utilization. If you received any old demands calculated on gross liability, you can challenge them citing this amendment which is retrospective from 1st July 2017.
Pay tax before the due date — even if you haven't filed the return yet. You can create a challan and deposit cash in your electronic cash ledger via GST PMT-06. Interest runs from the due date, not the filing date.
Reconcile ITC monthly — match your purchase register with GSTR-2B every month. Don't claim more than what's reflected in GSTR-2B, or you risk the 24% rate.
Use the QRMP scheme wisely — if you're a small taxpayer (turnover up to ₹5 crore), QRMP lets you file quarterly but pay tax monthly via PMT-06 challan. This avoids interest on monthly shortfalls.
Set calendar reminders — use our Due Date Calendar to track every GST deadline. Missing a date by even one day triggers interest.
Check for amnesty schemes — the government periodically announces late fee waivers (like the 2023 amnesty for returns up to March 2023). While these usually waive late fees rather than interest, some schemes have reduced interest rates too.
| Scenario | Rate | Section | Calculated On |
|---|---|---|---|
| Late filing with tax due | 18% p.a. | 50(1) | Net tax liability (cash portion) |
| Short payment of tax | 18% p.a. | 50(1) | Shortfall amount |
| Excess ITC claimed & used | 24% p.a. | 50(3) | Excess ITC amount utilized |
| Wrongful refund received | 24% p.a. | 50(3) | Refund amount to be returned |
| Section 73 demand (no fraud) | 18% p.a. | 73(1) + 50 | Tax determined in order |
| Section 74 demand (fraud/suppression) | 24% p.a. | 74(1) + 50 | Tax determined in order |
⚠️ Disclaimer: Calculations are for reference only. Verify with official GSTN portal or consult a CA before filing returns.
Calculate GST interest on late tax payment at 18% per annum or on excess ITC claims at 24% per annum under Section 50 of the CGST Act. Get exact day-wise interest breakdown with daily and monthly interest amounts for any delay period.
⚠️ Disclaimer: All calculations are for reference only. Verify with gst.gov.in or consult a qualified CA before filing returns.