GST Late Fee and Interest: How to Calculate with Examples

GST late fee and interest are two separate costs that hit a business when returns or tax payments are delayed. Late fee is a fixed amount per day of delay in filing a return, with caps based on turnover. Interest is a percentage charged on tax paid late, calculated on a daily basis. Both are payable in cash, neither can be paid from the input tax credit ledger, and both add up quickly when several returns are pending. This guide explains how each is calculated, the current daily rates and caps as notified, and worked examples so you can estimate the cost of a delay before it happens.

Late fee versus interest

Point	Late fee	Interest
Law	Section 47 of the CGST Act (and SGST Acts)	Section 50 of the CGST Act
Triggered by	Filing a return after its due date	Paying tax after its due date, or wrongly availing and utilising ITC
Computed as	Fixed amount per day, subject to caps	18% per annum (or as notified) on the tax amount, for the days of delay
Applies to nil returns	Yes, at a lower daily rate	No, because there is no tax
Payment	Cash ledger only	Cash ledger only

Late fee for GSTR-3B and GSTR-1

As notified in 2021 and applicable since, the late fee for GSTR-3B and GSTR-1 is:

Situation	Late fee per day (CGST + SGST)	Maximum per return (CGST + SGST)
Nil return (no tax liability / no outward supplies)	₹20 (₹10 + ₹10)	₹500
Aggregate turnover up to ₹1.5 crore	₹50 (₹25 + ₹25)	₹2,000
Aggregate turnover above ₹1.5 crore and up to ₹5 crore	₹50 (₹25 + ₹25)	₹5,000
Aggregate turnover above ₹5 crore	₹50 (₹25 + ₹25)	₹10,000

Late fee is counted from the day after the due date until the date of filing. Since GSTR-1 and GSTR-3B are separate returns, a delay in both attracts late fee on each. Waivers and amnesty schemes have been announced from time to time, so check the portal for any current relief. Late fee for GSTR-3B is computed by the system and appears in Table 5.1 of the next return you file.

Late fee for the annual return (GSTR-9)

For financial years from 2022-23 onwards, the late fee for GSTR-9 is linked to turnover:

Aggregate turnover in the year	Late fee per day (CGST + SGST)	Maximum
Up to ₹5 crore	₹50	0.04% of turnover in the state
Above ₹5 crore and up to ₹20 crore	₹100	0.04% of turnover in the state
Above ₹20 crore	₹200	0.5% of turnover in the state

Taxpayers with turnover up to ₹2 crore have been exempted from filing GSTR-9 for recent years. Confirm the position for the year you are filing. Our GSTR-9 guide covers the annual return in detail.

How GST interest is calculated

Section 50(1) charges interest at 18% per annum on tax that is paid after the due date. Since a 2021 amendment, effective retrospectively from 1 July 2017, interest is charged only on the portion of tax paid through the electronic cash ledger, where the return is filed late. Tax discharged by ITC is not charged interest, because the credit was already with the government.

Formula: Interest = Net cash tax x 18% x Number of days of delay / 365

Interest is calculated separately for each tax head (IGST, CGST, SGST and cess) and paid under the same head.

Worked example 1: GSTR-3B filed 15 days late

A Mumbai trader with turnover of ₹1 crore files October GSTR-3B on 5 December instead of 20 November, a delay of 15 days. Net cash liability after using ITC is CGST ₹50,000, SGST ₹50,000 and IGST ₹20,000.

Tax head	Cash tax	Interest (18% x 15/365)
CGST	₹50,000	₹369.86
SGST	₹50,000	₹369.86
IGST	₹20,000	₹147.95
Total	₹1,20,000	₹887.67

Check: ₹1,20,000 x 0.18 = ₹21,600 per year; ₹21,600 x 15 / 365 = ₹887.67. Late fee: 15 days x ₹50 = ₹750 (₹375 CGST + ₹375 SGST), below the ₹2,000 cap. Total cost of the delay: about ₹1,638, plus late fee on GSTR-1 if that was late too.

Worked example 2: two months late

The same trader files 60 days late. Interest: ₹1,20,000 x 0.18 x 60 / 365 = ₹3,550.68. Late fee: 60 x ₹50 = ₹3,000, but capped at ₹2,000 for turnover up to ₹1.5 crore. Total about ₹5,551. A business above ₹5 crore turnover would have paid ₹3,000 late fee, as its cap is ₹10,000.

Worked example 3: tax paid on time but return late

If the trader deposited the cash through PMT-06 by 20 November but filed GSTR-3B on 5 December, the cash was with the government on time. Interest on such amounts has been a point of debate, and rules now treat amounts deposited in the cash ledger before the due date (and not withdrawn) as tax paid for interest purposes, under a 2022 amendment to the interest rules. Late fee still applies because the return was late. Depositing tax on time is therefore a useful way to limit cost when filing is delayed by data issues.

Interest on wrongly availed ITC

Section 50(3) charges interest where ITC is wrongly availed and utilised. Rule 88B treats credit as utilised when the balance in the credit ledger falls below the wrongly availed amount, and interest runs from the date of utilisation to the date of reversal. The rate notified for this purpose is 18%.

Example: A company wrongly claims ₹1,00,000 of blocked ITC in its June return filed on 20 July. Its credit ledger balance stays above ₹1,00,000 until 20 August, when it falls to ₹40,000. The company reverses the credit on 19 October. Utilisation is ₹60,000 (₹1,00,000 minus ₹40,000) from 20 August. Interest = ₹60,000 x 18% x 60 / 365 = ₹1,775.34. If the balance never fell below ₹1,00,000, no interest would be due, though the credit still has to be reversed.

The hidden costs of filing late

Late fee and interest are only the visible part. A delay in GST filing has knock-on effects that often cost more:

• Customers lose credit. If GSTR-1 is late, your B2B customers do not see your invoices in their GSTR-2B, cannot claim credit and may hold your payments.
• Next returns are blocked. GSTR-3B for a period cannot be filed until earlier periods are filed, so one missed month blocks everything after it.
• E-way bill generation can be blocked if GSTR-3B is pending for two consecutive periods, stopping dispatches.
• Registration risk. Continuous non-filing can lead to suspension or cancellation of registration.
• ITC time limits. Credit for a financial year must be claimed by 30 November of the next year. Filing very late returns after that date means credit for those periods may be lost.
• Time-barred returns. Returns cannot be filed after three years from their due date, a rule the portal has begun to enforce.

A business that files GSTR-3B a few days late once in a while pays a few hundred rupees. A business that lets six months pile up may face blocked e-way bills, unhappy customers, possible cancellation and lost credit, which can far exceed the fees themselves.

How to pay late fee and interest

1. File the pending return. The portal computes late fee automatically for GSTR-3B and shows it in Table 5.1 or in the payment table.
2. For interest, the portal shows a system-computed amount based on filing date; check it and edit only if you have a basis.
3. Deposit cash through PMT-06 under the correct major head (CGST, SGST, IGST) and minor head (interest or late fee).
4. Offset from the cash ledger and file.
5. For interest relating to earlier periods discovered later, pay through DRC-03 and note the reason.

Common mistakes

• Computing interest on gross tax instead of net cash liability.
• Paying interest under the wrong tax head, which then needs a refund or transfer.
• Ignoring late fee on nil returns and letting several months pile up.
• Assuming a waiver applies without checking the exact notification.
• Not reversing wrongly availed credit quickly, which keeps interest running.

Use our GST compliance calendar to avoid delays in the first place.

How Fininvo helps

Fininvo ERP keeps tax liabilities, ITC and payments in ledgers tied to each transaction, so cash tax for a period is known before the due date and returns are generated from current data. See tax compliance, reports and pricing.

General information, not tax advice. Rates, caps and waivers are set by notification; check the GST portal and consult your CA.

Frequently Asked Questions

Can late fee be paid from the ITC ledger?

No. Late fee and interest must be paid in cash through the electronic cash ledger.

Is late fee charged on IGST?

Late fee is levied under the CGST and SGST Acts. Even if your liability is entirely IGST, late fee is paid as CGST and SGST components.

Is interest charged if I file late but have no tax to pay in cash?

No interest is charged where the entire liability is discharged through ITC, since interest applies to the cash portion. Late fee still applies.

What is the interest rate under GST?

Interest on delayed payment of tax is 18% per annum under section 50(1). Interest on wrongly availed and utilised ITC is also notified at 18%. Check current notifications before computing.

Can late fee be waived?

The government has announced waivers and amnesty schemes at times. Unless a current notification applies to your case, late fee is payable.