Free GST Late Fee Calculator & GST Interest Calculator—April 2026 Update
This free GST late fee calculator and GST interest calculator gives you your exact penalty in seconds. A missed GST deadline adds daily late fees and 18% annual interest to your dues. No formulas, no confusion - just instant, accurate results. April 2026 Update
Selected month due date: 20 April 2026.
Enter CGST, SGST and IGST directly. SGST will match CGST when it is blank.
Minimum cash balance in your Electronic Cash Ledger between due date and filing date. Leave blank (or ₹0) if unknown — interest will be on the full tax amount.
Late Fee (Section 47)
₹0
Interest (Section 50)
₹0.00
Total Penalty
₹0.00
(₹0 − ₹0) × 18% × 0 / 365 = ₹0 × 0.18 × 0 / 365 = ₹0
0 days × ₹50 = ₹0 (CGST: ₹0 + SGST: ₹0)
How to Use the GST Late Fee Calculator?
Get your exact GST late fee and interest in under 30 seconds. Follow these simple steps.
Select Return Type and Due Month
Choose whether you are filing GSTR-3B or GSTR-1. Then pick the month your return was due. The GST late fee calculator will set the correct due date automatically - 20th for GSTR-3B and 11th for GSTR-1.
Enter Your Actual Filing Date
Select the date you filed or plan to file your return. The tool calculates the exact number of days of delay and uses it to compute your GST late fee instantly.
Mark NIL Return If Applicable
If you had no tax liability for that period, check the NIL Return box. This applies the lower rate of Rs. 20 per day and caps the total GST late fee at Rs. 500 as required by GST law.
Enter Tax Amounts for GST Interest
For returns with tax liability, enter your CGST, SGST, and IGST amounts. The GST interest calculator applies 18% per annum under Section 50. You can also enter your ECL cash balance to use the Rule 88B deduction and reduce your interest.
Updated as of April 2026
GST Late Fee and Interest Rules You Must Know
This GST late fee calculator and GST interest calculator follow current regulations as of April 2026. We update this page whenever the Govt. issues new notifications or rate changes. Here is a clear breakdown of the rules.
GST Late Fee - Section 47, CGST Act
A GST late fee is a fixed daily penalty charged for every day you delay filing your return after the due date. It does not depend on your tax amount. It only depends on the number of days of delay.
| Return Type | CGST | SGST | Total/Day |
|---|---|---|---|
| Regular Return (with tax) | Rs. 25/day | Rs. 25/day | Rs. 50/day |
| NIL Return (zero tax) | Rs. 10/day | Rs. 10/day | Rs. 20/day |
Maximum GST Late Fee Cap
No matter how many days you delay, the GST late fee cannot go above the statutory cap. The total late fee is capped under both CGST Act and SGST Act separately.
| Return Type | CGST Cap | SGST Cap | Total Cap |
|---|---|---|---|
| Regular Return | Rs. 5,000 | Rs. 5,000 | Rs. 10,000 |
| NIL Return | Rs. 250 | Rs. 250 | Rs. 500 |
IGST is not applicable for late fees. Late fees are only levied under CGST and SGST Acts.
GST Interest Calculator - Section 50, CGST Act
GST interest is charged when you have an outstanding tax liability and you delay paying it. Unlike the GST late fee, interest is based on your tax amount. The rate is 18% per annum.
GST interest is not applicable for NIL returns since there is no tax liability. The result is rounded to the nearest rupee as per standard GST portal behaviour.
Rule 88B - ECL Deduction (Effective January 2026)
Rule 88B lets you reduce your GST interest base. If you kept a minimum cash balance in your Electronic Cash Ledger (ECL) during the delay period, that amount is excluded from the GST interest calculation.
If you are unsure of your ECL balance, leave it blank. The GST interest calculator will default to Rs. 0 and compute interest on the full tax amount. This gives the safest, most conservative estimate.
Disclaimer: This GST late fee calculator and GST interest calculator reflect regulations as of April 2026, including Notification 19/2021-CT, Section 47, Section 50, and Rule 88B of the CGST Act. Zubizi will update this tool if the Govt. issues revised notifications or rate changes. This tool is for informational purposes only. For final liability, consult a qualified CA or GST practitioner.
Why Use Our GST Late Fee Calculator?
Our GST late fee calculator and GST interest calculator are built for Indian businesses and tax professionals. Get accurate results instantly - no manual formulas, no spreadsheets, no errors.
Instant GST Late Fee Calculation
This GST late fee calculator updates your results the moment you change any field. There is no submit button. It re-computes your late fee in real time as you select dates or toggle return type. You see your penalty the instant you enter any value.
Built-In GST Interest Calculator
Beyond late fees, this tool also works as a GST interest calculator. It applies Section 50 at 18% per annum on your net tax liability. Just enter your CGST, SGST, and IGST amounts and the interest is calculated instantly alongside the late fee.
Accurate CGST and SGST Split
The GST late fee calculator correctly divides the penalty between CGST and SGST as per law. Regular returns are split at Rs. 25 per day each. NIL returns are split at Rs. 10 per day each. IGST is correctly excluded from late fees, as GST law mandates.
Covers Both Regular and NIL Returns
Whether you have a tax liability or are filing a NIL return, this tool handles both. Regular returns attract Rs. 50 per day (capped at Rs. 10,000). NIL returns attract Rs. 20 per day (capped at Rs. 500). The correct rate is applied automatically based on your selection.
Rule 88B ECL Deduction Support
This GST interest calculator supports the Rule 88B deduction introduced in January 2026. Enter your minimum Electronic Cash Ledger balance during the delay period to reduce your interest base. This can significantly lower your GST interest liability.
100% Free, No Signup, Fully Private
This GST late fee calculator is completely free. No account needed. No data sent to any server. All calculations run inside your browser on your own device. Your tax amounts and filing details never leave your screen. Safe to use for sensitive business data.
Need More Than a GST Late Fee Calculator?
Zubizi helps Indian businesses manage billing, GST invoices, inventory, and compliance in one place. Try it free - built for boutiques, retailers, and service businesses.
Frequently Asked Questions
Common questions about the GST late fee calculator and GST interest calculator.
