GSTR-3B February 2026: Every Change on the Portal — Explained Table by Table
When you open GSTR-3B for the February 2026 period, the portal will look and behave differently. New auto-computed interest you cannot edit down. A Rejected Records tab you’ve never seen before. IGST utilisation flexibility that wasn’t there last month. Here’s exactly what changed and what it means for your filing.
January 2026 period
non-editable downward
from Feb 2026
tab from Feb 18, 2026
1. Why GSTR-3B Changed — The Legal Background
The changes in GSTR-3B for the February 2026 filing period didn’t emerge from nowhere. They’re the result of two GSTN advisories — Advisory No. 647 (January 30, 2026) and its update Advisory No. 649 (February 19, 2026) — which were themselves long overdue implementations of provisions that had been in law for years but never enforced on the portal.
Section 50 of the CGST Act has always said interest is payable on delayed tax payments. And Rule 88B of the CGST Rules — introduced in October 2022 — specified that interest should be charged only on the net cash liability, giving credit for any cash already maintained in the Electronic Cash Ledger. But the GST portal was still computing interest the old way — on the gross liability. For over three years, taxpayers were potentially overpaying interest.
The January 2026 advisory finally brings the portal in alignment with the law. And as the portal evolves to enforce these legal provisions through automation, the era of manual overrides and flexible editing in GSTR-3B is closing.
2. Change 1: New Interest Formula in Table 5.1 (Non-Editable)
The interest computation in Table 5.1 of GSTR-3B has been fundamentally revised. The portal now calculates interest on delayed tax payment after giving the benefit of the minimum cash balance maintained in the Electronic Cash Ledger (ECL) from the due date of filing until the actual date of tax payment (offset). This is in direct compliance with the proviso to Rule 88B(1) of the CGST Rules.
Critically: the auto-populated interest figure is the minimum interest payable. You cannot edit it downward. You may only increase it if your own calculation suggests a higher amount. The system-computed figure is now mandatory.
The Old Method vs The New Method
- Interest computed on gross tax liability
- No credit for cash pre-deposited in ECL
- Taxpayers often overpaid interest
- Table 5.1 was manually editable
- Led to disputes — law said one thing, portal did another
- Interest on net cash shortfall only
- ECL minimum cash balance deducted from interest base
- System auto-populates correct (lower) interest
- Table 5.1 non-editable downward
- Portal finally aligned with Rule 88B(1)
The New Interest Formula
× (No. of Days Delayed / 365)
× Applicable Interest Rate (18% p.a.)
Important: Interest is only on the cash portion of tax — not on the ITC-offset portion. Tax paid through ITC never attracts interest.
Practical Worked Example — Interest Calculation
Scenario: A business had GST liability of ₹1,00,000 for January 2026. ₹40,000 was available as ITC. The remaining ₹60,000 cash tax was due by February 20. The business deposited ₹30,000 in ECL on February 20 (due date) but deposited the remaining ₹30,000 on March 5 and filed GSTR-3B on March 5 — 13 days late.
Saving under new method: ₹4,488 — and this is auto-computed by the portal. The business simply maintains adequate cash in ECL before the due date to minimise interest exposure. Under the new system, disciplined cash management directly reduces interest liability.
3. Change 2: Auto-Populated Tax Liability Breakup Table
When you report supplies from previous tax periods in the current GSTR-3B (for example, an October invoice reported in January’s GSTR-1 and tax paid in January’s GSTR-3B), the portal now auto-populates the Tax Liability Breakup Table showing which tax period each supply belongs to.
The breakup is derived from the document dates in your GSTR-1, GSTR-1A, or IFF. This allows the portal to accurately compute period-specific interest even when invoices are reported late. You can view this at: Login → GSTR-3B Dashboard → Table 5.1 (Payment of Tax) → Tax Liability Breakup.
The auto-populated values in the breakup table are suggestive in nature — you may increase them based on your own records, but the purpose is to assist accurate period mapping for interest calculations.
4. Change 3: IGST Cross-Utilisation Using CGST/SGST ITC
Under GST law, the ITC utilisation order has always been: first use IGST ITC to pay IGST, then CGST ITC for CGST, then SGST ITC for SGST. Any remaining IGST ITC can then be used for CGST and SGST. The law — Section 49(5) of CGST Act — also allows CGST and SGST ITC to be used for IGST payment after exhausting IGST ITC, in any sequence.
However, the GST portal had been blocking this flexibility — requiring CGST to be exhausted before SGST when paying IGST liability. Advisory 649 now unlocks this: once IGST ITC is fully exhausted, you can use CGST and SGST ITC to pay IGST in any sequence you choose, providing genuine flexibility in working capital management.
Important clarification from Advisory 649: This flexibility is available from the February 2026 tax period onwards. It was NOT available for January 2026 returns despite the earlier advisory — businesses that already filed January 2026 GSTR-3B were not able to use this.
5. Change 4: New IMS “Rejected Records” Tab
The Invoice Management System (IMS) now has a dedicated “Rejected Records” tab under the Outward Supplies section. This tab consolidates all rejected Credit Notes, Debit Notes, and amended records where the output tax liability of the supplier (your customer) needs to be added back into GSTR-3B.
Here’s the context: when a supplier issues a credit note and the recipient (you) rejects it in IMS, the credit note’s tax reduction reverses — meaning the supplier must add that tax back to their GSTR-3B liability. Previously, identifying these rejections required manually scanning all IMS data, which was time-consuming and error-prone. The new tab makes this instant.
For the recipient who rejected the credit note: you don’t claim the ITC reduction from that credit note. For the supplier whose credit note was rejected: you must add back the tax liability in your GSTR-3B. The new tab helps both parties identify these situations clearly.
6. Change 5: Interest on Delayed GSTR-10 for Cancelled Registrations
If a GST registration has been cancelled and the last applicable GSTR-3B was filed belatedly, the interest on that delayed filing will now be levied and collected through GSTR-10 (the Final Return).
This change adds clarity to a situation that previously caused confusion — when a cancelled taxpayer’s final GSTR-3B was late, there was no clear mechanism to collect the resulting interest. It was often disputed or left unresolved. Now, the Final Return (GSTR-10) will explicitly include the interest amount, making it a mandatory payment before GSTR-10 can be filed and the cancellation process fully completed.
If you have received a GST registration cancellation notice or have a business where GST registration was recently cancelled, ensure the last GSTR-3B is filed on time — or account for the interest that will appear in GSTR-10.
7. Continuing Change: Table 3.2 Non-Editable (Since November 2025)
This change didn’t originate in February 2026 — it’s been live since the November 2025 tax period — but many businesses are still adjusting to it, making it worth restating clearly.
Table 3.2 of GSTR-3B — which captures inter-state supplies made to unregistered persons, composition taxpayers, and UIN holders — is now completely auto-populated and non-editable. The values are derived directly from GSTR-1, GSTR-1A, or IFF entries.
Complete Summary: All GSTR-3B Changes in One Table
| Change | Table/Section | Effective From | Impact | Action Required |
|---|---|---|---|---|
| Interest auto-computed (Rule 88B) | Table 5.1 | Jan 2026 period | Potentially lower interest | Maintain cash in ECL before due date |
| Table 5.1 non-editable downward | Table 5.1 | Jan 2026 period | Cannot reduce system interest | No manual override possible |
| Tax Liability Breakup auto-populated | Table 5.1 sub-table | Jan 2026 period | Better period mapping | Verify GSTR-1 document dates are correct |
| IGST cross-utilisation — any order | Table 6.1 | Feb 2026 period | Flexibility in ITC utilisation | Reassess ITC utilisation strategy |
| IMS Rejected Records tab | IMS portal | Feb 18, 2026 | Easier reconciliation | Check tab before filing GSTR-3B |
| GSTR-10 interest for cancelled registrations | GSTR-10 (Final Return) | Jan 2026 period | Interest now collected in Final Return | File last GSTR-3B on time |
| Table 3.2 non-editable | Table 3.2 | Nov 2025 (ongoing) | Cannot manually correct | Fix via GSTR-1A before filing 3B |
8. Worked Example — Filing GSTR-3B Under New Rules
Scenario: Sharma Electronics Pvt. Ltd., a Delhi-based electronics dealer, is filing GSTR-3B for February 2026. Here’s how the new changes affect each step of their filing.
Step 1 — Login and check IMS Rejected Records tab first.
Before touching the return, Sharma’s accountant opens the new Rejected Records tab in IMS. They find that a credit note issued by a supplier (₹15,000 credit note for returned goods) was rejected by their customer, Mehta Traders. This means Sharma must add ₹15,000 of tax liability back into Table 3.1 of their GSTR-3B. Without the new tab, this would have been easy to miss.
Step 2 — Review Table 3.2 (non-editable).
Sharma made inter-state supplies of ₹2.5 lakh to unregistered buyers in Rajasthan. Table 3.2 is pre-filled from their GSTR-1 — they verify it matches and move on. No manual entry possible.
Step 3 — Check Table 5.1 for auto-computed interest.
Sharma filed January 2026 GSTR-3B late (filed Feb 28 instead of Feb 20 — 8 days late). Their tax liability was ₹2,00,000 cash. They had ₹1,50,000 in ECL on Feb 20. Under the new formula:
Interest = (₹2,00,000 – ₹1,50,000) × (8/365) × 18% = ₹50,000 × 0.0219 × 0.18 = ₹197.26
Under the old method, interest would have been on the full ₹2,00,000 = ₹789. The new method auto-populates ₹197. Sharma cannot edit this downward — and they shouldn’t need to.
Step 4 — IGST ITC utilisation.
Sharma has IGST liability of ₹80,000. Their IGST ITC is only ₹30,000. Remaining ₹50,000 needs to come from CGST/SGST. They have ₹60,000 CGST credit and ₹20,000 SGST credit. Under the old system, they had to use all CGST first. Under the new February 2026 rule, they can split it — say ₹25,000 CGST and ₹25,000 SGST — preserving their CGST credit for their own CGST liability. Better cash management.
Watch: GSTR-3B February 2026 Changes Explained
9. Action Checklist Before You File February 2026 GSTR-3B
□ Open IMS Rejected Records tab — identify any rejected credit/debit notes requiring liability addition
□ Verify Table 3.2 auto-filled values match your GSTR-1 inter-state supply data
□ Review the Tax Liability Breakup Table for accuracy on prior-period supplies
□ Note the auto-computed interest in Table 5.1 — do not attempt to edit it downward
□ Plan your IGST ITC utilisation — now use CGST/SGST in any order after IGST ITC exhaustion
□ Ensure your ECL has adequate cash balance before March 20 due date to minimise interest
□ If Table 3.2 has errors, file GSTR-1A before filing GSTR-3B
□ File by March 20, 2026 (monthly filers) / March 22 or 24 (QRMP filers)
Need Help Filing GSTR-3B Correctly Under New Rules?
The new changes to Table 5.1, the IMS Rejected Records tab, and IGST utilisation flexibility require careful attention. Our team files your GSTR-3B correctly the first time, every time.
Get Filing Help Now Our GST Services10. Frequently Asked Questions
Official Sources
- GSTN Advisory 647 — January 30, 2026 (Interest Collection & GSTR-3B Enhancements)
- GSTN Advisory 649 — February 19, 2026 (IGST Cross-Utilisation Clarification)
- GST Tutorial Portal — Advisory on Interest Calculator (PDF)
- GST Portal (gst.gov.in) — GSTR-3B filing, IMS, ECL management
- CBIC (cbic.gov.in) — Rule 88B and Section 50 provisions
Related Guides
Don’t Risk a Wrong GSTR-3B Filing
With non-editable interest, auto-populated tables, and new IMS requirements — GSTR-3B errors are now harder to fix. Let our team file it correctly from Day 1.
Talk to a GST Expert GST Filing Services