What is GSTR-3B and Why Is It Important?
GSTR-3B is the monthly summary return that every regular GST-registered taxpayer must file to declare their outward supplies, inward supplies attracting reverse charge, ITC claimed, and net GST liability for each month. Unlike GSTR-1 which is a detailed invoice-wise outward supply declaration, GSTR-3B is a summary return — it reports consolidated values at the tax rate level rather than individual invoice details.nnGSTR-3B is the return against which GST liability is paid. The net tax payable (output tax minus ITC) computed in GSTR-3B must be paid through the Electronic Cash Ledger by the due date. Failure to pay GST by the due date attracts interest at 18% per annum on the unpaid amount from the due date until actual payment — this is one of the highest statutory interest rates in Indian tax law and underscores the importance of timely payment.nnGSTR-3B filing is a prerequisite for filing GSTR-1 for the next period — the GST portal enforces sequential return filing. Additionally, the taxpayer's GST registration status, ITC availability, and e-way bill generation capability are tied to GSTR-3B compliance. Taxpayers with outstanding GSTR-3B returns face restrictions on these functionalities, making GSTR-3B one of the most operationally critical returns in the GST compliance calendar.
GSTR-3B Due Dates FY 2025-26 — Monthly and QRMP
GSTR-3B due dates vary based on taxpayer category and the state of registration. For regular monthly filers and QRMP scheme taxpayers, the due dates for FY 2025-26 are as follows.nnMonthly filers and QRMP scheme taxpayers whose principal place of business is in Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, Daman and Diu, Dadra and Nagar Haveli, Puducherry, Andaman and Nicobar Islands, Lakshadweep — GSTR-3B is due by the 20th of the following month. For QRMP taxpayers in these states, the due date is the 22nd of the month following the quarter.nnQRMP scheme taxpayers whose principal place of business is in Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand, Odisha, Jammu and Kashmir, Ladakh, Delhi, Chandigarh — GSTR-3B is due by the 24th of the month following the quarter. For all monthly filers nationwide, the due date is uniformly the 20th of the following month throughout FY 2025-26.
| Taxpayer Type | Turnover | GSTR-3B Due Date |
|---|---|---|
| Monthly filer — all states | Any (or above Rs.5Cr) | 20th of the following month |
| QRMP — Category 1 states (south and west) | Up to Rs.5Cr | 22nd of month following quarter |
| QRMP — Category 2 states (north and east) | Up to Rs.5Cr | 24th of month following quarter |
| April 2025 | Monthly | 20 May 2025 |
| May 2025 | Monthly | 20 June 2025 |
| Q1 FY 2025-26 (Apr-Jun) QRMP Cat 1 | Quarterly | 22 July 2025 |
| Q1 FY 2025-26 (Apr-Jun) QRMP Cat 2 | Quarterly | 24 July 2025 |
| March 2026 | Monthly | 20 April 2026 |
GSTR-3B Tables — What to Fill Where
GSTR-3B contains six main tables. Understanding each table's scope prevents misreporting which is one of the most common GST audit triggers.nnTable 3.1 covers details of outward supplies and inward supplies attracting reverse charge. Table 3.1(a) is for outward taxable supplies other than zero-rated, nil-rated, and exempted — this is where regular domestic sales are reported, split into IGST, CGST, and SGST amounts. Table 3.1(b) is for outward taxable supplies at zero rate — exports under LUT (no IGST) and supplies to SEZs. Table 3.1(c) is for other outward supplies — nil-rated and exempted supplies. Table 3.1(d) is for inward supplies under reverse charge — all RCM purchases including GTA freight, legal services, imported services, and any other RCM category.nnTable 3.2 covers interstate supplies to unregistered persons, composition dealers, and UIN holders — needed for the GST compensation cess to states and for interstate supply reporting. Table 4 is the ITC table — the most critical and sensitive table. Table 4(A)(1) is for ITC available from IGST on imports. Table 4(A)(3) is for inward supplies liable to reverse charge. Table 4(A)(5) is for all other ITC including regular GSTR-2B sourced ITC on domestic purchases. Table 4(B) is for ITC reversals — proportionate reversals for exempt supplies, 180-day payment rule reversals, and others. Table 5 covers exempt, nil-rated, and non-GST outward supplies.nnTable 6 covers payment of tax — the actual GST liability computation. Taxpayers enter IGST, CGST, and SGST payable, set off available ITC credits in the prescribed order (IGST ITC first against IGST, then CGST, then SGST; CGST ITC against CGST then IGST; SGST ITC against SGST then IGST), and compute the net cash payment required.
How to File GSTR-3B Online — Step by Step
GSTR-3B is filed on the GST portal at gst.gov.in. Step 1: Log in with GSTIN and password. Navigate to Returns then Returns Dashboard. Select the financial year and tax period. Click on Monthly Return GSTR-3B. Step 2: The portal auto-populates certain fields from GSTR-1 data (outward supplies) and GSTR-2B data (ITC). Review the auto-populated figures carefully — the GSTR-3B system prompt tells you whether it has pre-filled from GSTR-1/GSTR-2B or requires manual entry.nnStep 3: Fill Table 3.1 with outward supply summaries. Ensure the figures match your sales register. Any discrepancy between GSTR-3B outward supplies and GSTR-1 invoice-wise data will be flagged during annual reconciliation in GSTR-9. Step 4: Fill Table 4 ITC. Enter ITC available as per GSTR-2B only — do not include ITC for invoices absent from GSTR-2B. Enter reversals in Table 4(B) if applicable — 180-day unpaid invoices, proportionate reversals for exempt supplies. Net ITC (available minus reversals) is computed automatically.nnStep 5: The system computes tax payable in Table 6. Verify the cash balance in your Electronic Cash Ledger. If insufficient, deposit additional cash using GSTR-PMT-06 before proceeding. Step 6: Click Preview Draft GSTR-3B to review the complete return before submission. Step 7: Submit using DSC for companies or EVC for others. Once submitted, the return is locked and cannot be revised — only through subsequent period amendments or rectification.
GSTR-3B Late Fee, Interest and Consequences
The consequences of late GSTR-3B filing operate on two levels: late fees for the delay and interest on unpaid tax for the period beyond the due date.nnLate fee for GSTR-3B: Rs.50 per day for returns with tax liability (Rs.25 CGST + Rs.25 SGST) and Rs.20 per day for nil returns (Rs.10 CGST + Rs.10 SGST). The maximum late fee per return is Rs.10,000 (Rs.5,000 CGST + Rs.5,000 SGST) for returns with tax liability and Rs.500 total for nil returns. Late fees are waived or reduced through periodic CBIC amnesty schemes for habitual defaulters — such schemes have been announced multiple times since GST introduction, though they are not a predictable compliance strategy.nnInterest on unpaid GST: Section 50 of the CGST Act charges interest at 18% per annum from the day after the due date until the date of actual payment. For a business owing Rs.5 lakh in GST for April 2025 (due 20 May 2025) that pays on 20 August 2025 — a 3-month delay — the interest is Rs.5,00,000 x 18% x 3/12 = Rs.22,500. A special lower rate of 9% per annum applies when the taxpayer has filed GSTR-3B but made a genuine error resulting in excess ITC claim — the 9% rate applies only in specific narrow circumstances confirmed by CBIC circular, not for routine late payment.nnSystematic non-filing of GSTR-3B also results in issuance of GSTN notices, potential suspension of GST registration under Rule 21A, cancellation of registration after persistent default, and inability to generate e-way bills — which disrupts goods movement for manufacturing and trading businesses.
