GST Penalty for Late Return Filing: Late Fee, Interest, and Section 122 Penalty Explained

TL;DR

Late filing of GST returns has three independent cost layers that stack: (1) Section 47 late fee of ₹50/day (₹25 CGST + ₹25 SGST) for normal filers, ₹20/day for NIL returns, capped at ₹10,000 per Act per return period. (2) Section 50 interest at 18% per annum (1.5% per month) on the tax amount unpaid, calculated from the due date to the date of actual credit in the cash ledger. (3) Section 122 penalty up to ₹10,000 per offence for repeated non-filing without reasonable cause. The CGST Act makes all three independent — you can pay the late fee but still owe the interest, or vice versa.

The Three-Layer Penalty Structure

The GST regime’s late-filing regime is intentionally layered. Late fee addresses the procedural breach of not filing on time. Interest addresses the substantive cost of the government not having the tax due. Section 122 penalty addresses the offence of non-compliance with the Act.

Layer	Statutory basis	Amount	Cap
Late fee (return)	Section 47	₹50/day normal; ₹20/day NIL	₹10,000 per Act per period
Late fee (annual)	Section 47	₹100/day for GSTR-9; ₹50/day NIL annual	0.25% of turnover
Interest on tax	Section 50	18% per annum (1.5% per month)	None
Penalty	Section 122	Up to ₹10,000 per offence (or tax evaded)	Per offence
GSTIN cancellation	Section 29	Cancellation after 6 months continuous default	n/a

Section 47 — The Late Fee

For monthly returns GSTR-1 and GSTR-3B, the late fee under Section 47 (read with Notification 7/2023-CT) is:

• ₹50 per day of delay for normal filers — split as ₹25 CGST + ₹25 SGST, or ₹50 IGST for Union Territory taxpayers without a State legislature.
• ₹20 per day for NIL returns — split as ₹10 CGST + ₹10 SGST, designed to encourage small businesses with no activity to file rather than ignore.
• Cap: ₹10,000 per Act (CGST + SGST) per return period. So the maximum late fee for a single GSTR-3B filed 200 days late is ₹10,000 (CGST) + ₹10,000 (SGST) = ₹20,000.

The cap is per Act, not combined. So the total late fee exposure is double the cap for a regular intra-State taxpayer. For IGST-only (inter-State supply without physical State), the cap is ₹10,000 combined.

The day count starts from the day immediately after the due date and continues till the date of actual filing. Weekends and public holidays count — there is no holiday exemption under Section 47. The day of filing itself is included in the day count if filing happens after the due date.

For GSTR-9 (annual return), the late fee is different — ₹100 per day (₹50 CGST + ₹50 SGST) capped at 0.25% of aggregate turnover in the relevant State (₹2,500 CGST + ₹2,500 SGST for a ₹20 lakh turnover; the cap scales with turnover up to the standard ₹5,000 / ₹5,000 for large taxpayers). NIL annual filers pay ₹100 per day with the same turnover-based cap.

Section 50 — The Interest on Tax

Late fee addresses the procedural breach. Interest under Section 50 addresses the financial cost to the government of not having the tax due. The interest is charged only on the unpaid tax amount, not the late fee.

The formula is straightforward: 18% per annum on the unpaid tax from the due date of payment to the date of actual credit in the Electronic Cash Ledger. The monthly equivalent is 1.5% (18% / 12). The interest compounds only on simple-interest basis — the GST portal does not charge interest on interest.

For GSTR-3B specifically:

• Tax due on 20th of the following month.
• Cash ledger debit happens on the actual filing date.
• Interest accrues for each day from 21st of the following month till the date of cash ledger debit.
• Interest is calculated on the net tax (output minus eligible ITC).

Example: a taxpayer with ₹5 lakh net tax for the month of March 2025, filing GSTR-3B on 30 April 2025 (10 days late, on the last permitted day for that period), pays:

• Late fee: 10 × ₹50 = ₹500 (CGST) + ₹500 (SGST) = ₹1,000
• Interest: ₹5,00,000 × 18% × (10 / 365) = ₹2,466
• Total penalty exposure: ₹3,466

If the late filing is 90 days late (filing on 30 June), the interest becomes ₹22,192 — significantly more than the late fee. This is why interest, not late fee, is the dominant cost in long delays.

Section 122 — The Substantive Penalty

The most serious layer is Section 122, which applies when a taxpayer “without reasonable cause” fails to file returns, issues invoices without supplying goods or services, or otherwise contravenes the Act in a way that attracts penalty.

The standard penalty under Section 122(1)(iii) for non-filing is ₹10,000 or the amount of tax evaded, whichever is higher. For repeated non-filing, the assessing officer can invoke Section 122(1)(xv) for general non-compliance, with the same ₹10,000-or-evaded-amount framework.

In practice, Section 122 is invoked only after:

1. SCN (Show Cause Notice) under Section 73 or 74
2. Personal hearing opportunity under Section 75
3. Order under Section 73(9) or 74(9) determining the tax, interest and penalty
4. Recovery under Section 79 if unpaid

For ordinary monthly late filings (not repeated, not combined with other defaults), the GST department typically relies on the Section 47 late fee + Section 50 interest without invoking Section 122. Section 122 enters the picture when the department finds substantive non-compliance — e.g., invoices issued without corresponding goods movement, repeated non-filing despite multiple notices, or wilful evasion.

Section 29 — Cancellation of GSTIN

The compounding risk: under Section 29(2)(c), if a taxpayer fails to file returns for six consecutive months (for normal filers) or two consecutive return periods for QRMP filers, the proper officer can cancel the registration. The cancellation order follows a SCN and personal hearing under Section 29(3).

Cancellation has severe downstream consequences:

• All pending returns must be filed within 30 days (treated as deemed filed after that)
• The taxpayer cannot issue tax invoices during the cancellation period
• Input tax credit claims for the cancellation period are blocked
• A new GSTIN application attracts enhanced scrutiny for three years
• E-commerce platforms must delist the cancelled GSTIN immediately

Revocation under Section 30 is possible within 30 days of the cancellation order, but only after all pending returns are filed and any tax + interest + penalty due is paid.

Practical Penalty Quantification

For a small trader doing ₹50 lakh turnover, missing one quarter of GSTR-3B (3 months × 1 return each = 3 returns × ₹10,000 cap per Act = ₹60,000 max late fee) and assuming ₹1 lakh average tax per month unpaid for 90 days:

Component	Calculation	Amount
Section 47 late fee	3 returns × ₹20,000 cap	₹60,000
Section 50 interest	₹1 lakh × 18% × 90/365 × 3 months	₹13,315
Section 122 (if invoked)	Up to ₹10,000 × 3 returns	₹30,000
Professional fee to fix	CA charges for back-filing + revocation	₹15,000-30,000
Total exposure		₹1.18-1.33 lakh

For larger traders, the penalty exposure scales — interest at 18% on ₹10 lakh unpaid tax for 6 months is ₹90,000, on top of late fees.

Amnesty Schemes the Government Has Run

The Government has notified several amnesty windows under Section 128 to encourage compliance:

• FY 2017-18 and FY 2018-19: Reduced late fee (capped at ₹500 / ₹200 for NIL) for late GSTR-3B filed between July-December 2019.
• FY 2019-20: Reduced late fee (capped at ₹250) for GSTR-3B filed between July 2020 and September 2020.
• FY 2020-21: Similar amnesty (Notification 57/2020-CT) with late fee capped at ₹500.

These amnesty windows are infrequent and not predictable. If you are currently behind on returns, file now rather than wait for the next amnesty announcement — the 18% interest accrues daily.

How FinTax24 Helps

Our GST Late Fee Calculator computes the exact late fee and interest for any return period. For ongoing compliance, our GST Return Filing service includes the GSTR-3B filing with full reconciliation, supplier follow-up for missing GSTR-1, and an annual GSTR-9 included. If your GSTIN has been cancelled or you are approaching 6 months of non-filing, talk to our indirect-tax desk — we handle the revocation under Section 30 as part of a one-time catch-up engagement.

When to Escalate

Talk to a FinTax24 expert if any of these apply: GSTR-3B unpaid for more than 30 days (interest has crossed the late fee), GSTIN cancellation order received or pending, Section 122 show cause notice received, multi-State operations with separate GSTINs where one is non-compliant, or FY end closing with non-filed annual return (GSTR-9). Self-service works for the first missed return — once interest accrues past ₹50,000 or a cancellation notice lands, professional intervention pays for itself in the first month.