GST Late Fee & Interest Calculator — Penalty Estimator FY 2025–26
Calculate the exact late fee and interest payable for delayed GST return filing. Enter the return type, due date, filing date, and outstanding tax amount — get a day-wise breakdown of late fee (₹50/day or ₹20/day for nil returns) and interest (18% p.a.) under both CGST and SGST. Supports GSTR-1, GSTR-3B, GSTR-9, GSTR-4, and CMP-08 with turnover-based caps. Built by practising Chartered Accountants.
Calculate GST Late Fee & Interest
How to Use the GST Late Fee Calculator
This calculator helps you estimate the exact penalty for delayed GST return filing. Follow these steps:
Step 1 — Select Return Type
Choose the GST return form you filed late — GSTR-3B, GSTR-1, GSTR-9, GSTR-4, or CMP-08. Each return has different late fee rates and caps. Also select whether it was a nil return (no tax liability) or a regular return.
Step 2 — Enter Dates
Enter the original due date of the return and the actual date you filed or plan to file. The calculator computes the exact number of days of delay. For GSTR-3B, the due date is typically the 20th of the following month as per the GST portal calendar.
Step 3 — Enter Tax Amount & Turnover
Enter the outstanding tax payable (after ITC adjustment) for interest calculation, and select your annual turnover slab for the appropriate late fee cap. The calculator applies turnover-based caps as notified by CBIC.
CA Tip: Always file the return even if you cannot pay the full tax immediately. Filing with partial payment stops the late fee clock. Interest continues on the unpaid balance, but late fees are calculated only until the date of filing. This can save thousands in penalties for businesses with cash flow constraints.
GST Late Fee Rates for FY 2025–26
Late fees under GST are prescribed under Section 47 of the CGST Act, 2017. The fee is charged per day of delay from the due date until the actual filing date. Here are the current rates:
| Return | Regular (per day) | Nil Return (per day) | Max Cap |
|---|---|---|---|
| GSTR-3B | ₹50 (₹25 CGST + ₹25 SGST) | ₹20 (₹10 + ₹10) | Turnover-based* |
| GSTR-1 | ₹50 (₹25 CGST + ₹25 SGST) | ₹20 (₹10 + ₹10) | Turnover-based* |
| GSTR-9 | ₹200 (₹100 + ₹100) | — | 0.5% of turnover in state |
| GSTR-4 | ₹50 (₹25 + ₹25) | ₹20 (₹10 + ₹10) | ₹2,000 |
| CMP-08 | ₹50 (₹25 + ₹25) | ₹20 (₹10 + ₹10) | ₹10,000 |
*Turnover-based caps for GSTR-3B and GSTR-1: up to ₹1.5 Cr turnover = ₹2,000 cap; ₹1.5–5 Cr = ₹5,000 cap; above ₹5 Cr = ₹10,000 cap.
Important: Late fees must be paid in cash only — you cannot use Input Tax Credit from your electronic credit ledger to pay late fees. Ensure sufficient balance in your cash ledger before filing delayed returns on the GST portal.
Interest on Delayed GST Payment — Section 50 of CGST Act
Section 50 of the CGST Act prescribes interest on delayed payment of tax. The interest is separate from late fees and applies on the outstanding tax amount:
| Scenario | Interest Rate | Calculated On |
|---|---|---|
| Late payment of tax (Section 50(1)) | 18% per annum | Net cash tax liability* |
| Excess ITC claimed (Section 50(3)) | 24% per annum | Excess ITC utilised |
*After the amendment effective September 2020, interest on delayed GSTR-3B filing is charged on the net cash liability (tax payable after adjusting eligible ITC), not on the gross liability.
Interest = Tax Amount × 18% × (Days of Delay ÷ 365)
Example: ₹1,00,000 tax paid 30 days late
= ₹1,00,000 × 0.18 × (30 ÷ 365)
= ₹1,479
Interest is computed from the day after the due date until the actual date of payment. It applies separately on CGST, SGST, and IGST components. The GST Council has the authority to modify these rates through notifications.
Turnover-Based Late Fee Caps
The GST Council introduced graded late fee caps based on annual turnover to provide proportional relief to smaller businesses. These caps apply to GSTR-3B and GSTR-1:
| Annual Turnover | Max Late Fee (Regular) | Max Late Fee (Nil Return) |
|---|---|---|
| Up to ₹1.5 Crore | ₹2,000 per return | ₹500 per return |
| ₹1.5 Cr – ₹5 Crore | ₹5,000 per return | ₹500 per return |
| Above ₹5 Crore | ₹10,000 per return | ₹500 per return |
These caps mean that even if the calculated late fee exceeds the cap amount, the taxpayer pays only the capped amount. For example, a business with ₹1 crore turnover filing GSTR-3B 100 days late would have a calculated late fee of ₹5,000 (100 × ₹50), but would pay only ₹2,000 due to the turnover cap.
CA Tip: The Institute of Chartered Accountants of India (ICAI) recommends that businesses with seasonal cash flow should still file returns on time with whatever tax they can pay. Late fees stop accruing on the date of filing, while interest continues only on the unpaid tax balance. This separation can result in significant savings.
Consequences of Continued Non-Filing
Beyond late fees and interest, continued non-filing of GST returns triggers escalating consequences that can severely impact business operations:
E-Way Bill Blocking
If GSTR-3B is not filed for two or more consecutive months, the E-Way Bill generation facility is blocked automatically. This prevents the movement of goods and can halt supply chain operations. The block is restored only after all pending returns are filed with applicable penalties.
GST Registration Cancellation
Non-filing for six continuous months can trigger suo motu cancellation of GST registration under Section 29 of the CGST Act. A show cause notice (Form REG-17) is issued first, and the taxpayer has 30 days to respond. Once cancelled, the business cannot issue tax invoices or collect GST.
Sequential Filing Requirement
GST returns must be filed sequentially — you cannot file a later month without first filing all previous months. This means accumulated non-filing creates a cascading backlog where all pending returns must be filed with cumulative late fees before the latest return can be submitted.
Three-Year Filing Window
From FY 2024-25 onwards, GST returns cannot be filed more than three years after the original due date. This hard limit means that unresolved past-due returns must be addressed within the window to avoid permanent non-compliance. Check the CBIC website for any extensions or amnesty schemes.
Compliance Alert: If you have multiple unfiled returns, prioritise filing the oldest ones first. Contact a Chartered Accountant to assess the total liability including late fees and interest before initiating the filing process. The GST amnesty schemes announced periodically can significantly reduce the penalty burden.
Need help filing delayed GST returns? Our Chartered Accountants handle late return filing, penalty computation, and compliance restoration for businesses across India. Talk to a CA today →
