GSTR-3B is a monthly or quarterly self-declared summary return filed by every GST-registered taxpayer under Section 39 of the CGST Act, 2017. It covers outward supply details, ITC availed, and tax payable/paid. Below are 15 detailed FAQs covering every critical aspect of filing.
20th 18% p.a. ₹10,000
Monthly due date Interest on delayed tax Max late fee per return
Q1 What is GSTR-3B and what is its legal basis? Fundamentals
GSTR-3B is a simplified monthly/quarterly self-declaration return prescribed under Rule 61(5) of the CGST Rules, 2017 read with Section 39 of the CGST Act, 2017. It was introduced as a temporary measure in July 2017 but continues to be mandatory.
Key purpose: It enables the government to collect tax on a regular basis without waiting for the detailed invoice-level reconciliation that happens through GSTR-1 and GSTR-2A/2B.
GSTR-3B captures summary-level data on:
- Outward taxable supplies (B2B, B2C, exports, SEZ, exempt)
- Inward supplies subject to reverse charge
- ITC availed and reversed
- Net tax payable under IGST, CGST, SGST/UTGST, and Cess
It is not a replacement for GSTR-1 (invoice-level data) but must be filed independently every period.
Q2 Who must file GSTR-3B and who is exempt? Applicability
Every regular GST-registered taxpayer is mandatorily required to file GSTR-3B, including those with zero transactions during the period.
| Category | Return to File | GSTR-3B Required? |
| Regular taxpayer (monthly) | GSTR-3B monthly | ✅ Yes |
| QRMP scheme taxpayer | GSTR-3B quarterly | ✅ Yes (quarterly) |
| Composition dealer | GSTR-4 (annually) | ❌ No |
| Input Service Distributor (ISD) | GSTR-6 | ❌ No |
| Non-Resident Taxable Person | GSTR-5 | ❌ No |
| OIDAR service provider (foreign) | GSTR-5A | ❌ No |
⚠ Even if turnover is nil for the period, a nil GSTR-3B must be filed before the due date to avoid late fees.
Q3 What are the due dates for GSTR-3B filing and what happens if they are missed? Due Dates
Due dates vary based on the filing frequency and the taxpayer’s category:
| Category | Due Date |
| Monthly filers (all states) | 20th of the following month |
| QRMP — Category 1 states (15 states incl. Maharashtra, Karnataka, Gujarat) | 22nd of month following the quarter |
| QRMP — Category 2 states (remaining states/UTs) | 24th of month following the quarter |
Consequences of missing the due date:
- Late fee: ₹50/day (₹25 CGST + ₹25 SGST). For nil returns: ₹20/day (₹10+₹10). Maximum capped at ₹10,000 per return.
- Interest: 18% p.a. on net tax liability from the day after the due date until actual payment.
- ITC blockage: Recipient cannot avail ITC until supplier files the return and pays tax.
- Cancellation risk: Non-filing for 6 consecutive months can lead to suo-motu cancellation of GST registration.
Q4 Can GSTR-3B be revised after filing? How are errors corrected? Revision
Unlike Income Tax Returns, GSTR-3B cannot be revised once filed. This is explicitly stated under the GST law. However, corrections can be made through the following methods:
⚠ Important: There is no “amend GSTR-3B” option on the GST portal. All corrections are prospective.
Method 1 — Outward supply errors: If outward supply was under-reported, report the excess amount in the next month’s Table 3.1. If over-reported, reduce the figures accordingly. The interest on short-paid tax (if any) must be paid separately.
Method 2 — ITC errors: Excess ITC claimed must be reversed in Table 4(B) in the subsequent month with interest at 18% p.a. (or 24% p.a. in case of fraud). Short ITC can be claimed in subsequent months within the time limit — earlier of:
- 30th November of the next financial year, or
- Date of filing of annual return (GSTR-9)
✅ Best practice: Always verify all values in draft mode before final submission. Once you click “File”, the return is irrevocable.
Q5 How should outward supplies be reported in Table 3.1 of GSTR-3B? Table 3.1
Table 3.1 is the most critical table — it captures the summary of all outward supplies. It has 5 sub-categories:
| Row | Nature of Supply | What to Report |
| 3.1(a) | Outward taxable supplies (other than zero-rated, nil, exempt) | All regular B2B and B2C taxable supplies including intra-state and inter-state |
| 3.1(b) | Outward taxable supplies — zero rated | Exports (with/without IGST payment) and supplies to SEZ units/developers |
| 3.1(c) | Other outward supplies — nil rated, exempt | Supplies on which GST rate is 0% or specifically exempted by notification |
| 3.1(d) | Inward supplies (liable to reverse charge) | Purchases where YOU are liable to pay GST as recipient (e.g., from URD, legal services, GTA) |
| 3.1(e) | Non-GST outward supplies | Supplies outside GST scope — alcohol, petroleum (before notified), electricity |
⚠ Common mistake: Including exempt and nil-rated supplies in 3.1(a) instead of 3.1(c). This inflates your tax liability incorrectly.
Q6 What is Table 3.2 in GSTR-3B and why is it frequently missed? Table 3.2
Table 3.2 captures the state-wise breakup of inter-state supplies made to unregistered persons, composition dealers, and UIN holders. This data is critical for the government to allocate IGST revenue to the consuming state.
⚠ This table is auto-populated from GSTR-1 data but must be verified and reported correctly. Many taxpayers skip this assuming it’s optional — it is NOT.
Why it matters:
- IGST collected on inter-state sales is held by the Centre. The consuming state gets its SGST share only after proper reporting.
- Missing or incorrect data in 3.2 can trigger scrutiny notices from the department.
- It helps in cross-verifying with GSTR-1 data filed by the supplier.
✅ Tip: If you file GSTR-1 before GSTR-3B, Table 3.2 values are auto-populated. Always verify them against your books before filing.
Q7 How is Input Tax Credit (ITC) to be reported and availed in GSTR-3B? Table 4 — ITC
Table 4 of GSTR-3B is divided into three parts — ITC Available (4A), ITC Reversed (4B), and Ineligible ITC (4D).
| Sub-table | Description |
| 4A(1) | ITC on import of goods (IGST paid at customs) |
| 4A(2) | ITC on import of services |
| 4A(3) | ITC on inward supplies attracting reverse charge (RCM) |
| 4A(4) | ITC received from Input Service Distributor (ISD) |
| 4A(5) | All other ITC — domestic purchases from registered suppliers |
| 4B(1) | ITC reversed under Rule 42/43 (used for exempt or personal purposes) |
| 4B(2) | Other reversals (e.g., excess ITC correction, TRAN-1 errors) |
| 4D(1) | ITC ineligible under Section 17(5) — blocked credits (motor vehicles, food, club, etc.) |
| 4D(2) | ITC ineligible due to IGST paid on imports under Section 3 of Customs Tariff Act |
Net ITC = 4A minus 4B minus 4D. This net ITC is credited to the electronic credit ledger and used to offset output tax liability.
📌 Always reconcile your books of accounts with GSTR-2B before filling Table 4. ITC in GSTR-3B should never exceed what is reflected in GSTR-2B.
Q8 What is the Rule 36(4) restriction on ITC and how does it impact GSTR-3B filing? Rule 36(4)
Rule 36(4) of the CGST Rules restricts the ITC that a registered person can claim in GSTR-3B to the ITC that is reflected in their GSTR-2B. ITC on invoices not appearing in GSTR-2B cannot be availed until they are reported by the supplier in GSTR-1.
⚠ Prior to January 2022, there was a 5% provisional credit buffer. This buffer has been removed. Now ITC must be 100% matched with GSTR-2B.
Practical implications:
- If your supplier has not filed GSTR-1, their invoices will not appear in your GSTR-2B, and you cannot claim ITC on them.
- Excess ITC claimed beyond GSTR-2B is liable to be reversed with interest at 18% p.a. if detected during audit or scrutiny.
- Always download and review GSTR-2B (auto-generated on the 14th of the following month) before filing GSTR-3B.
✅ Best practice: Maintain a monthly ITC reconciliation register comparing: Purchase register vs GSTR-2B vs ITC claimed in GSTR-3B.
Q9 What are blocked credits under Section 17(5) that cannot be claimed in GSTR-3B? Blocked ITC
Section 17(5) of the CGST Act lists categories of inward supplies on which ITC is specifically blocked regardless of business use. These must be reported in Table 4D(1) but cannot be used to offset output tax.
| Category | Examples | Exception (ITC allowed if…) |
| Motor vehicles (≤13 persons) | Cars, two-wheelers | Used for transport business, driving school, or further supply of vehicles |
| Food, beverages, outdoor catering | Office canteen, team meals | Obligatory to provide under law or used for further supply of same category |
| Beauty treatment, health services | Salon, spa, cosmetic surgery | Used for further taxable supply of same category |
| Membership of clubs | Golf clubs, fitness clubs | None |
| Works contract for immovable property | Construction, renovation of building | Used for further supply of works contract service |
| Goods/services for personal use | Director’s personal expenses | None |
| Rent-a-cab | Employee cab service | Obligatory under law or for further supply |
⚠ Claiming blocked ITC is a serious compliance error. Departments frequently look for such credits during GST audits. Reverse them proactively.
Q10 How should tax be paid and offset against liability in GSTR-3B? Payment & Offset
Tax payment in GSTR-3B operates through three ledgers maintained on the GST portal:
- Electronic Cash Ledger: Funded by direct tax payments (challan via net banking, UPI, etc.). Used for paying any remaining tax after ITC setoff, and for paying interest, late fees, and penalties.
- Electronic Credit Ledger: Funded by ITC. Used only to offset output tax liability.
- Electronic Liability Ledger: Records all tax dues (self-assessed and demand-based).
📌 ITC Utilisation Order under Section 49(5) — mandatory sequence:
| ITC Type | First Used Against | Then Against | Cannot Be Used Against |
| IGST ITC | IGST liability | CGST, then SGST | — |
| CGST ITC | CGST liability | IGST liability | SGST/UTGST |
| SGST/UTGST ITC | SGST/UTGST liability | IGST liability | CGST |
⚠ Cross-utilisation between CGST and SGST is strictly prohibited. Late fee, interest and penalties can ONLY be paid from the cash ledger — never from ITC.
Q11 What is the QRMP scheme and how does GSTR-3B filing differ under it? QRMP Scheme
The Quarterly Return Monthly Payment (QRMP) scheme, introduced from 1 January 2021, allows taxpayers with aggregate annual turnover up to ₹5 crore to file GSTR-1 and GSTR-3B quarterly instead of monthly.
| Aspect | Regular Monthly Filer | QRMP Filer |
| GSTR-3B frequency | Monthly (by 20th) | Quarterly (by 22nd/24th) |
| GSTR-1 frequency | Monthly (by 11th) | Quarterly (by 13th of following month) |
| Tax payment | Monthly via GSTR-3B | Monthly challan (PMT-06) for M1 & M2; GSTR-3B for M3 |
| IFF (Invoice Furnishing Facility) | Not applicable | Optional for M1 & M2 B2B invoices to pass ITC to recipients |
PMT-06 payment options for M1 & M2:
- Fixed sum method: Pay 35% of net cash tax paid in the last quarter’s GSTR-3B (system auto-calculates).
- Self-assessment method: Calculate actual liability for the month and pay accordingly.
✅ QRMP reduces filing burden significantly. Ideal for small businesses with stable turnover. Opt in/out by 31st January for the next financial year.
Q12 How are reverse charge mechanism (RCM) supplies reported in GSTR-3B? RCM
Under Reverse Charge Mechanism (RCM), the recipient (not the supplier) is liable to pay GST. GSTR-3B has specific reporting requirements for RCM transactions:
Step 1 — Report tax liability (Table 3.1(d)): Enter the taxable value and tax amount for all RCM purchases. This creates a tax liability in your electronic liability ledger which must be paid in cash (ITC cannot be used to pay RCM liability).
⚠ RCM liability MUST be paid through the cash ledger. Using ITC to pay RCM tax is not permitted.
Step 2 — Claim ITC on RCM (Table 4A(3)): Once you pay RCM tax in cash, you can claim an equivalent ITC in the same return period, provided the goods/services are used for a taxable outward supply and no Section 17(5) block applies.
Common RCM situations:
- Purchases from unregistered dealers (specified goods/services)
- Legal services received from individual advocates
- Goods Transport Agency (GTA) services
- Import of services from outside India
- Security services received from unregistered persons
✅ ITC claimed under RCM in Table 4A(3) is available in the same month as payment — unlike regular ITC which depends on supplier filing.
Q13 What is the correct way to report nil-rated, exempt, and non-GST supplies in Table 5? Table 5
Table 5 of GSTR-3B captures supplies that are either outside the GST tax base or attract 0% GST. Many taxpayers confuse these categories, leading to incorrect reporting.
| Category | Meaning | Examples | Reported In |
| Nil-rated supplies | GST is applicable but rate is 0% by notification | Salt, bread, fresh milk, eggs (unprocessed) | Table 5 / 3.1(c) |
| Exempt supplies | Supply is notified as exempt from GST | Fresh vegetables, educational services, healthcare | Table 5 / 3.1(c) |
| Non-GST supplies | Completely outside the purview of GST | Alcohol for human consumption, petrol/diesel (pre-notification), electricity | Table 3.1(e) |
Why reporting matters:
- ITC on inputs used for exempt/nil-rated supplies must be reversed under Rule 42 — correct classification ensures correct reversal calculation.
- Mismatch between Table 5 data and GSTR-1 exempt supplies can trigger ASMT-10 scrutiny notices.
- Non-GST supplies reported in GSTR-1 must tally with Table 3.1(e) of GSTR-3B.
📌 Pro tip: If a supply is partly exempt and partly taxable (mixed supply), determine the nature correctly under Section 8 before reporting.
Q14 What happens to GSTR-3B filing if GST registration is cancelled or surrendered?Post-Cancellation
Cancellation of GST registration does not automatically stop the filing obligation. The following obligations remain:
- File all pending GSTR-3B: All returns from the last filed period up to the effective date of cancellation must be filed. This is a mandatory pre-condition for processing the cancellation application.
- File GSTR-10 (Final Return): Within 3 months of the date of cancellation order or the date of cancellation, whichever is later. This captures the closing stock on which ITC was availed and must be reversed.
⚠ Failure to file GSTR-10 results in a best-judgment assessment by the officer under Section 62, and late fees of ₹200/day (₹100 CGST + ₹100 SGST) apply.
ITC reversal at cancellation: ITC on goods in stock and capital goods (proportionate) as on the date of cancellation must be reversed. The amount to be reversed is the higher of: ITC attributable to stock remaining, or the tax payable on transaction value of such goods.
✅ After filing GSTR-10, the taxpayer’s GSTIN is permanently deactivated and no further returns need to be filed.
Q15 What are the most common errors and red flags that invite GST notices related to GSTR-3B? Common Errors
The GST department uses data analytics to compare GSTR-1, GSTR-3B, and GSTR-2B data. The following mismatches and errors are the most frequent triggers for scrutiny notices (ASMT-10), demand notices (DRC-01), and audit selection:
| # | Error / Mismatch | Risk Level | How to Avoid |
| 1 | GSTR-1 taxable value > GSTR-3B Table 3.1(a) | High | Reconcile before filing both returns |
| 2 | ITC in GSTR-3B > ITC in GSTR-2B | Very High | Always check GSTR-2B (14th of each month) before filing |
| 3 | Claiming blocked ITC under Section 17(5) | High | Maintain blocked ITC register; reverse proactively in 4D |
| 4 | Not reporting reverse charge liability in 3.1(d) | Medium | Maintain RCM purchase register; compute liability monthly |
| 5 | Nil-rated/exempt included in taxable supply (3.1a) | Medium | Classify supplies correctly before reporting |
| 6 | Table 3.2 not filled or filed with wrong state codes | Medium | Auto-populate from GSTR-1; verify state-wise data |
| 7 | Not paying interest on late tax payment | High | Compute and pay interest via cash challan before or with return |
| 8 | Excess ITC carried forward without reversal | High | Perform Rule 42/43 calculation each month; reverse in 4B |
✅ Maintain a monthly GSTR-3B checklist: reconcile books → check GSTR-2B → compute RCM → calculate Rule 42/43 reversal → verify ITC eligibility → then file.
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