Indirect Tax Laws and Practice · GST Returns

Late Fee, Interest and Return Defaults under GST

Updated 11 October 2026 · Fact-checked

A late return attracts a late fee (a fixed daily amount) and interest on tax paid late. Under rule 88B, interest on a late-filed return is charged only on the part of tax paid through the electronic cash ledger, for the days of delay. Late fee is computed day by day using the rates notified for the return form.

Understand Late Fee, Interest and Return Defaults

A registered person must file returns by the due date and pay tax by then. If you miss either, GST has two separate costs. Late fee is a penalty for not filing on time. Interest is compensation to the government for the tax it received late.

The two are independent. A nil return can attract late fee but no interest, because no tax was paid late. A return filed on time with tax paid late has no late fee but has interest.

Rule 88B tells you how to compute interest. If the supplies are declared in a return filed after the due date under section 39, interest is calculated on the portion of tax paid by debiting the electronic cash ledger, for the period of delay beyond the due date. Tax paid from the electronic credit ledger carries no interest in this case. This does not apply if the return is filed after proceedings under section 73, section 74 or section 74A have begun for that period.

In all other cases, interest runs on the tax that remains unpaid, from the date it was due until the date it is paid. Where input tax credit is wrongly availed and utilised, interest runs on the amount wrongly availed and utilised, from the date of utilisation until reversal or payment. The rate is the one notified under section 50.

Defaults also hurt other areas. If a supplier does not file GSTR-3B, your credit on that supplier's invoices can be reversed under rule 37A. Non-filing can also lead to a best judgment assessment under section 62, and continued non-filing affects e-way bill generation and registration status. Check the current notification for the exact rule.

Key rules to remember

Interest on late-filed return (rule 88B(1)): Interest = tax paid through electronic cash ledger × notified rate × days of delay ÷ 365; Applies when supplies are declared in a return filed after the due date. Credit ledger payments are excluded. Rate is notified under section 50(1). Does not apply if filed after proceedings under section 73, 74 or 74A have started.
Cash ledger proviso: Amount credited to cash ledger on or before due date and lying there until debit at filing is excluded from interest; Added by the 2024 amendment to rule 88B(1). Such balance is not counted.
Interest in all other cases (rule 88B(2)): Interest = unpaid tax × notified rate × days from due date to payment date ÷ 365; Applies to all cases not covered by rule 88B(1).
Interest on wrongly availed and utilised ITC (rule 88B(3)): Interest = ITC wrongly availed and utilised × notified rate × days from utilisation to reversal or payment ÷ 365; Mere availment without utilisation does not attract interest under section 50(3). Utilisation occurs when the credit ledger balance falls below the wrongly availed amount.
Date of utilisation (Explanation to rule 88B(3)): Earlier of due date and actual filing date, if utilised through the return; otherwise the date of debit; Extent of utilisation is the amount by which the ledger balance falls below the wrongly availed credit.
Rule 37A reversal: Reverse ITC by 30 November if supplier's GSTR-3B is not filed by 30 September following the financial year; If not reversed, the amount is payable with interest under section 50. You may re-avail if the supplier files later.
Late fee on assessment order (section 62): Return filed within 60 days of the order: order is withdrawn; a further 60 days allowed with an additional late fee of ₹100 per day; Interest under section 50(1) and late fee under section 47 continue to apply.

How to solve Late Fee, Interest and Return Defaults questions

Use this sequence for any question on late fee, interest or return default.

1Identify the return, its due date and the actual filing date. Count days of delay carefully.
2Separate the late fee from the interest. Decide whether each applies.
3For interest, check whether the return declaring the supplies was filed late (rule 88B(1)) or the tax is simply unpaid (rule 88B(2)).
4Under rule 88B(1), take only the tax paid through the electronic cash ledger. Exclude credit ledger payments and any cash balance that was in the ledger on or before the due date and stayed there.
5Apply the rate given in the question (use the notified rate if none is given) as rate × days ÷ 365 on the right base.
6For ITC issues, find the date of utilisation, not the date of availment, and compute interest to the date of reversal.
7Add the late fee as per the rates given. State consequences such as notice, section 62 assessment or rule 37A reversal if asked.
8Write the final amounts and a one-line conclusion.

Quickest way: Three-question filter

When to use it: Use for MCQs and for the first line of a written answer.

Was tax paid late? If no, there is no interest, only late fee.
Was it paid by cash ledger or credit ledger? Interest under rule 88B(1) only on the cash portion.
Was ITC only availed or also utilised? Interest only on the utilised portion, from the date of utilisation.

Common mistakes in Late Fee, Interest and Return Defaults

Charging interest on the entire tax liability of a late return.
Students assume interest follows the full tax amount.
Fix: Under rule 88B(1), charge interest only on the portion paid through the electronic cash ledger.
Charging interest on a nil return.
Late fee and interest are mixed up.
Fix: No tax was paid late, so no interest. Late fee alone may apply.
Counting interest on wrongly availed ITC from the date of availment.
Students read 'wrongly availed' and stop.
Fix: Interest under rule 88B(3) runs from the date of utilisation, and only on the utilised amount.
Including cash balance that was lying in the ledger on the due date.
The proviso to rule 88B(1) is overlooked.
Fix: Exclude amounts credited on or before the due date and lying in the ledger until debited at filing.
Using 360 days or wrong day counts.
Haste with calendar counting.
Fix: Use 365 days and count the days from the day after the due date to the date of payment.
Forgetting rule 37A when a supplier has not filed GSTR-3B.
Students look only at the buyer's own returns.
Fix: Check whether the supplier filed by 30 September after the year. If not, reverse by 30 November or pay with interest.

Worked examples

Example 1

Arvind Traders, Pune, filed its GSTR-3B for a month 10 days after the due date. Tax liability was ₹2,00,000. It paid ₹60,000 from the electronic cash ledger and ₹1,40,000 from the electronic credit ledger. No amount was in the cash ledger before the due date. Assume the notified interest rate is 18% per annum. Compute the interest.

Show the solution

The supplies were declared in a return filed after the due date, so rule 88B(1) applies.
Interest is on the portion paid by debiting the cash ledger: ₹60,000.
Interest = 60,000 × 18% × 10 ÷ 365.
60,000 × 0.18 = 10,800. 10,800 × 10 = 1,08,000. 1,08,000 ÷ 365 = ₹295.89 (approx.).

Answer: Interest is about ₹296. The ₹1,40,000 paid from the credit ledger carries no interest under rule 88B(1).

Example 2

Meera Pharma availed ITC of ₹1,00,000 wrongly on 5 May. The credit ledger balance fell below ₹1,00,000 on 20 May because of a debit for payment of tax. The credit was reversed on 19 June. Assume the interest rate is 24% per annum. Compute the interest.

Show the solution

Rule 88B(3) applies: interest runs from the date of utilisation to the date of reversal.
The utilisation was by a debit on 20 May. This is not payment through the return, so the date of debit applies.
The balance fell below ₹1,00,000, so the utilised amount is the extent of the fall. Here it is taken as ₹1,00,000 for simplicity.
Days from 20 May to 19 June = 30 days.
Interest = 1,00,000 × 24% × 30 ÷ 365 = 7,20,000 ÷ 365 = ₹1,972.60 (approx.).

Answer: Interest is about ₹1,973. No interest accrues from 5 May to 20 May, since the credit was only availed, not utilised.

Exam tips

Always separate late fee and interest in your answer. Examiners award marks for each.
Quote rule 88B sub-rules by number. State the base on which interest is charged.
In case scenarios, check the dates: due date, filing date, utilisation date and reversal date.
If the question gives the rate, use it. If not, say 'at the rate notified under section 50'.
Mention linked consequences, such as section 62 assessment and rule 37A reversal, only when the facts point to them.

Practice questions from GST Returns

Late Fee, Interest and Return Defaults in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Late Fee, Interest and Return Defaults: frequently asked questions

Is interest charged on tax paid through input tax credit when the return is late?

Under rule 88B(1), interest on a late-filed return is calculated on the portion paid by debiting the electronic cash ledger. Payment from the credit ledger is not included.

Do I pay late fee and interest both?

They are separate. Late fee applies for the delay in filing. Interest applies for delay in paying tax. A late return with tax paid late can attract both.

What happens if a registered person does not file returns even after notice?

Under section 62, the proper officer can assess the tax liability to the best of judgment and issue an order. If a valid return is filed within sixty days of service, the order is deemed withdrawn, but interest and late fee still apply.

Can I lose ITC because my supplier did not file GSTR-3B?

Yes. Under rule 37A, you must reverse such ITC if the supplier has not filed GSTR-3B by 30 September following the financial year, and you must do so by 30 November. You can re-avail it if the supplier files later.