GSTR-3B Update: New ‘Tax Liability Breakup’ Confirmation Rule Creates Confusion — What Taxpayers Must Do Now
Date: March 16, 2026
Source: GSTN Advisory
A major update rolled out by the Goods and Services Tax Network (GSTN) from the February 2026 tax period has created confusion among taxpayers across the country. The update relates to the “Tax Liability Breakup, As Applicable” tab in Form GSTR-3B, which must now be confirmed before filing the return, even when the entire tax liability belongs to the current month.
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| GSTR-3B Update: New ‘Tax Liability Breakup’ - (AI Generated Image) |
This long-awaited clarification seeks to bring transparency in the reporting of past-period supplies and ensure accurate interest calculation under Section 50 of the Central Goods and Services Tax (CGST) Act, 2017. However, the mandatory confirmation requirement for all taxpayers—whether or not they have past-period liabilities—has triggered widespread queries and feedback.
This detailed report explains the issue, the GSTN’s official response, the temporary compliance steps taxpayers must follow, and what changes are expected next.
Why the “Tax Liability Breakup” Tab Exists
Under Section 50 of the CGST Act, taxpayers must pay interest when:
- A supply relates to a previous tax period, but
- The tax on that supply is discharged in a later tax period.
To ensure correct interest calculation, the GST Portal introduced the “Tax Liability Breakup, As Applicable” tab in Form GSTR-3B. This tab requires taxpayers to clearly show:
| Purpose of the Tab | Details Captured |
|---|---|
| Identify tax on past-period supplies | Tax amount related to previous tax months |
| Confirm correct periodwise adjustment | How much tax belongs to current vs. past periods |
| Enable auto-interest computation under Section 50 | Helps GST system detect late-reported supplies |
Simply put, the tab ensures that the GST system knows whether you are paying tax for current month supplies or previous month supplies.
What Changed From February 2026?
Beginning February 2026, the GST Portal introduced auto-population of this breakup. The system now automatically detects:
- Document dates in GSTR-1, GSTR-1A, or IFF
- Whether an invoice belongs to the current or earlier tax period
- Whether the corresponding tax is being discharged in the current GSTR-3B
When past-period supplies are detected, the portal auto-fills the breakup amounts.
This automation was expected to help taxpayers, especially businesses with high monthly invoice volumes.
New Step Required: Mandatory Confirmation Before Filing
From February 2026, taxpayers must:
- Go to the Payment Page in GSTR-3B
- Click the “Tax Liability Breakup, As Applicable” tab
- Review the auto-populated breakup
- Click SAVE to confirm
- Only then proceed to file GSTR-3B with EVC or DSC
This step must be completed even if:
- All tax belongs to the current period
- There are no previous-period invoices
- No edits are required in the breakup
Why Taxpayers Are Upset: Confirmation Required in All Cases
GSTN acknowledged receiving complaints that the system forces the confirmation even when:
- No past-period supplies exist
- All invoices pertain to the current month
- The breakup table is showing zero values for previous periods
Key Concern Raised
Taxpayers argued that:
- Confirmation should be mandatory only if past-period invoices are reported.
- For current-period-only filings, the tab should not block return submission.
GSTN has officially confirmed that this feedback is valid and the issue is under active resolution.
GSTN’s Interim Advisory to Taxpayers
Until the issue is fixed on the portal, the GSTN has advised taxpayers to:
✔ Open the “Tax Liability Breakup, As Applicable” tab
✔ Click the SAVE button (even if everything is already correct)
✔ Proceed with filing GSTR-3B normally
This is a mandatory temporary requirement.
Complete Breakdown of GSTN’s Advisory (Simplified)
| Advisory Point | Meaning in Simple Words |
|---|---|
| The tab is meant to capture taxes belonging to previous months | If you declare old invoices now, GST wants to know |
| Auto-population starts from Feb 2026 | System fills in the breakup from your GSTR-1 data |
| Taxpayers must confirm the breakup | You must click SAVE after checking the amounts |
| Filing allowed only after confirmation | Without clicking SAVE, return filing won't work |
| Feedback: confirmation should not be required for current-month invoices | Taxpayers want this step skipped if everything belongs to the same month |
| GSTN admits issue and is fixing it | A portal update will come soon |
| Meanwhile, taxpayers must click SAVE every time | Mandatory until the fix is released |
Example Scenario to Understand the Update
Scenario 1: Past-Month Invoice Declared in Current GSTR-1
- Invoice date: 10 December 2025
- Reported in February 2026 GSTR-1
- Tax paid in February 2026 GSTR-3B
The system will automatically categorize tax as:
| Tax Period | Amount |
|---|---|
| Previous Period (Dec 2025) | Tax Amount |
| Current Period | Remaining liability |
You must confirm this breakup.
Scenario 2: All Supplies Belong to February 2026
- All invoices dated February 2026
- No old invoices
- Tax belongs entirely to the current period
Still, you must click SAVE in the breakup tab until GSTN fixes the issue.
Impact on Businesses and Tax Professionals
This small step may appear simple, but for businesses filing under:
- Monthly regular scheme
- Multiple GSTINs
- Bulk invoice systems
- Enterprise-level GSTR-3B filings
…even a minor portal change adds compliance load.
Many tax professionals report:
- Delays in filing
- Confusion among staff
- Additional validation work
- Increased chances of missing the SAVE step
Possible Upcoming Fix Expected
GSTN is working on:
- Making the confirmation optional when liability belongs to the current period
- Triggering confirmation only when:
- GSTR-1 has previous-period invoices
- Tax on those invoices is paid now
An official update is expected soon after validation and system testing.
Detailed Reference Table for Taxpayers
Below is a table summarizing what taxpayers need to do depending on the type of invoices:
| Invoice Type | Belongs to Current Period? | Needs Confirmation? | Auto-Population? | Interest under Sec 50? |
|---|---|---|---|---|
| Current-month invoices | Yes | Yes (temporarily) | Yes | No |
| Previous-month invoices declared late | No | Yes | Yes | Yes |
| Amendments to old invoices | No | Yes | Yes | Depends on timing |
| Nil return (no sales) | — | Yes (temporarily) | Zero values | No |
| IFF declarations for QRMP | Maybe | Yes | Yes | Case-based |
Conclusion
The latest update to GSTR-3B aims to improve transparency and ensure accurate interest calculation under the CGST Act. However, because the GST Portal currently requires mandatory confirmation of the “Tax Liability Breakup, As Applicable” tab in all cases, many taxpayers are facing unnecessary delays and confusion.
GSTN has acknowledged the issue and is working toward a fix. Until then, taxpayers must follow the interim process:
Open the Breakup Tab → Click SAVE → File GSTR-3B Normally
Staying compliant with this advisory will prevent return filing errors and avoid last-minute portal issues.