GST Interest and Late Fee: Calculation, Applicability and Payment Rules
Manish Sahu
GST Compliance & Accounting Specialist
GST interest and late fee are additional amounts that may become payable when a taxpayer delays tax payment or files a GST return after the prescribed due date. Interest relates mainly to delayed payment of tax, while late fee is connected with delayed filing of a return or statement.
These amounts are separate from the original GST liability. A business should calculate them correctly, pay them through the permitted ledger and retain the payment record with its GST documents.
What is GST interest?
Interest is charged when tax remains unpaid or is paid after the statutory due date. Section 50 of the CGST Act provides the framework for interest on delayed payment of tax.
Interest is generally calculated on the amount of tax that remains unpaid for the period of delay. The applicable rate and calculation method may depend on the relevant provision, notification and type of liability.
Interest is not the same as a penalty. Interest compensates for the delayed payment of tax, while a penalty may arise from a separate contravention or proceeding under the GST law.
What is a GST late fee?
Late fee is charged when a taxpayer does not furnish a required GST return or statement within the prescribed time. Section 47 of the CGST Act provides the legal framework for late fees, subject to the applicable rules, notifications and caps.
The actual amount can depend on the return type, number of days delayed, whether the return is a nil return and any relief or waiver notified by the Government. The amount displayed on the GST Portal should be checked before filing.
Difference between GST interest and late fee
Point | Interest | Late fee |
|---|---|---|
Main reason | Delay in paying tax | Delay in filing a return or statement |
Linked to | Unpaid or delayed tax liability | Number of days of filing delay |
Legal provision | Section 50 of the CGST Act | Section 47 of the CGST Act |
Payment method | Generally through the electronic cash ledger | Generally through the electronic cash ledger |
When can interest become payable?
Interest may become payable when a taxpayer:
Reports tax but pays it after the due date
Understates output tax in a return and pays the balance later
Delays payment of tax under reverse charge
Uses ineligible input tax credit and later reverses it
Fails to pay additional tax identified during reconciliation
Pays tax after an order, assessment or other statutory liability
For reverse-charge transactions, the recipient should identify the liability in the correct period and pay it through the prescribed method. Read our Reverse Charge Mechanism under GST guide for related information.
How to calculate interest
A simple interest calculation can be explained using the following formula:
Interest = Tax unpaid × annual interest rate × number of days of delay ÷ 365
For example, assume that ₹50,000 of tax remains unpaid for 20 days and the applicable annual interest rate is 18%:
Particular | Amount |
|---|---|
Unpaid tax | ₹50,000 |
Assumed annual rate | 18% |
Delay | 20 days |
Illustrative interest | ₹493.15 |
This is only an educational example. The applicable rate, starting date, ending date and tax base must be confirmed under the current law and notification. The GST Portal calculation should be checked before payment.
How late fee is calculated
Late fee is generally linked to the number of days between the prescribed due date and the date on which the return is filed. The law and notifications may prescribe different amounts or maximum limits for different returns.
Late-fee treatment can also differ for nil returns and non-nil returns. Because these amounts are amended from time to time, do not rely on an old calculator or an earlier filing experience. Verify the amount shown on the GST Portal for the relevant return period.
Returns where late fee may apply
Depending on the taxpayer’s registration type and filing frequency, late fee may arise for delayed filing of forms such as:
GSTR-1
GSTR-3B
Annual return forms
Composition taxpayer statements and returns
Other prescribed GST statements
For a detailed explanation of GSTR-1 and GSTR-3B, read our GSTR-1 and GSTR-3B guide.
How to pay interest and late fee online
Log in to the official GST Portal.
Open the relevant return period.
Review the tax, interest and late-fee amounts displayed.
Generate a challan through Services, Payments and Create Challan if additional cash is required.
Deposit the amount into the electronic cash ledger.
Use the permitted ledger balance while filing the return.
Check that the return status changes to filed successfully.
Save the challan, payment reference and filed-return acknowledgement.
Interest, late fee and penalty should not be treated as eligible input tax credit. These amounts generally need to be paid from the electronic cash ledger.
For more details, read our GST payment online and PMT-06 guide.
Example of total additional liability
Suppose a business has ₹25,000 of delayed tax and the GST Portal calculates ₹300 as interest. The portal also shows ₹500 as late fee for delayed return filing. The business must pay the tax, interest and late fee according to the displayed liability before completing the filing process.
The exact amount depends on the return type, delay period, applicable rate, relief notification and previous payments. Use this example only to understand the difference between the three amounts.
Common mistakes to avoid
Confusing interest with late fee
Using an old late-fee rate without checking the portal
Paying tax but forgetting the interest amount
Using input tax credit to pay interest or late fee
Filing the return without checking the liability summary
Ignoring reverse-charge interest
Not saving payment and filing acknowledgements
Assuming a nil return is always free from late fee
Conclusion
GST interest and late fee are separate compliance amounts. Interest is mainly connected with delayed tax payment, while late fee generally arises from delayed return filing. Check the latest statutory provisions, notifications and GST Portal calculation before making payment.
Maintaining updated invoices, sales records, input tax credit details and payment challans helps reduce mistakes. You can also review our GST refund guide and Place of Supply under GST guide for related compliance topics.