GSTR-3B ITC Higher Than GSTR-2B? How to Handle Zero ITC and GST Mismatch Notices

A GST taxpayer may find that the ITC claimed in GSTR-3B is higher than the amount shown by the GST portal in GSTR-2B. In an extreme case, a particular month’s GSTR-2B figure may even appear as zero, creating an apparent annual mismatch and potentially triggering scrutiny.

That does not automatically mean the ITC claim is wrong. But it also does not mean taxpayers can ignore GSTR-2B merely because the invoices appear in GSTR-2A.

The correct approach is to reconcile GSTR-2B, GSTR-2A, the purchase register and supplier filings before filing GSTR-3B and again before responding to any departmental notice.

Why a GSTR-3B vs GSTR-2B Mismatch Matters

Input Tax Credit is subject to the conditions prescribed under Section 16 of the CGST Act. Among other conditions, the taxpayer must possess the prescribed tax document, receive the goods or services and satisfy the statutory supplier/reporting requirements.

GSTR-2B has consequently become an important system-generated source for ITC reconciliation. The GST Portal also uses GSTR-2B data for important annual-return computations; from FY 2023-24 onward, Table 8A of GSTR-9 is populated using GSTR-2B information.

A difference between GSTR-3B and GSTR-2B therefore deserves investigation rather than automatic acceptance or automatic reversal.

What if March GSTR-2B Shows Zero?

Suppose the taxpayer’s annual ITC reconciliation looks like this:

If most of the difference relates to one month appearing as zero, the first question should be:

Are the underlying invoices genuinely absent, or is the comparison data incomplete?

Do not immediately conclude that it is a GST portal defect. As of August 2026, there is no general GSTN advisory establishing that every March 2026 GSTR-2B shown as zero is a system-wide technical error.

The taxpayer should verify the transaction invoice by invoice.

Check GSTR-2A—but Do Not Treat It as a Replacement for GSTR-2B

GSTR-2A can be extremely useful diagnostically.

For example, where March invoices appear in GSTR-2A and the supplier’s GSTR-1 information indicates that the invoices were uploaded/filed within the relevant period, that evidence can help explain why a zero figure in another portal comparison requires closer examination.

However, GSTR-2A and GSTR-2B are not interchangeable.

GST Portal documentation itself distinguishes between information appearing in GSTR-2A and information ultimately considered through GSTR-2B for later compliance functions. It also notes that merely uploaded/submitted supplier information may not necessarily be treated the same as properly filed information.

Therefore, “invoice is visible in 2A” should be part of your evidence—not the entire legal argument.

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Reconcile These Four Records Before Filing GSTR-3B

A good monthly ITC control should compare:

1. Purchase register — what your books say you purchased.
2. Tax invoices — whether valid supporting invoices are available.
3. GSTR-2A/GSTR-2B — what supplier-side information has reached the GST system.
4. GSTR-3B — what ITC you are actually claiming.

The reconciliation should identify separately:

• Invoice completely missing from GST data;
• Supplier filed late;
• Invoice reported with incorrect GSTIN;
• Wrong invoice number/date;
• Credit note adjustment;
• Invoice appearing in 2A but not in the expected 2B;
• Duplicate ITC;
• Blocked/ineligible ITC; and
• Timing differences.

A single annual total is not enough. Maintain an invoice-wise reconciliation.

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What Happens if ASMT-10 Is Issued?

Under Rule 99, where a return is selected for scrutiny and the proper officer finds a discrepancy, the officer can issue FORM GST ASMT-10, quantify the apparent discrepancy and seek an explanation.

The rules provide that the response period specified in the notice cannot exceed 15 days. The taxpayer can either accept the discrepancy and make the required payment or furnish an explanation in FORM GST ASMT-11. If the explanation is accepted, the officer communicates acceptance in ASMT-12.

Therefore, receiving ASMT-10 does not itself establish that ITC is finally inadmissible.

It starts a scrutiny process in which evidence matters.

How to Reply When the Portal Figure Is Wrong

A strong response should not simply say:

“GST portal has a technical problem.”

Instead provide a reconciliation demonstrating the problem.

Your supporting set may include:

• Invoice-wise GSTR-3B vs GSTR-2B reconciliation;
• Downloaded GSTR-2A;
• Relevant GSTR-2B files/screenshots;
• Purchase register;
• Copies of tax invoices;
• Supplier GSTIN and invoice details;
• Evidence of supplier GSTR-1 filing dates;
• Goods-receipt or service-supporting records;
• Payment evidence, where relevant; and
• A month-wise explanation of the mismatch.

If the entire disputed amount is caused by one month’s data being absent from the comparison report while invoice-level evidence exists elsewhere in the GST system, clearly demonstrate that fact mathematically.

Do Not Claim ITC Solely Because the Portal Is Wrong

This distinction is critical.

Even where the portal comparison contains an obvious anomaly, ITC must still satisfy the substantive conditions of Section 16.

For example, a taxpayer cannot use a technical discrepancy as protection where:

• The invoice itself is fake;
• Goods or services were never received;
• ITC is blocked under the Act;
• The same invoice was claimed twice; or
• Other statutory ITC conditions are not met.

A system error can rebut an incorrect mismatch allegation. It cannot create ITC that the law otherwise prohibits.

Practical GSTR-3B Filing Checklist for 2026

Before filing each GSTR-3B:

This monthly discipline is much easier than reconstructing twelve months of evidence after receiving a scrutiny notice.

Frequently Asked Questions

If GSTR-2B shows zero, must I reverse all ITC?

Not automatically. First determine why it is zero and whether the underlying invoices satisfy the statutory ITC conditions. But claiming ITC contrary to the applicable Section 16 requirements merely because invoices exist in your books is also unsafe.

Can GSTR-2A prove that my ITC is correct?

It can be valuable supporting evidence, particularly for demonstrating supplier-upload information and timing. It should be considered together with GSTR-2B, purchase records and statutory eligibility conditions.

Does ASMT-10 mean the GST demand is final?

No. ASMT-10 seeks an explanation during scrutiny. The taxpayer can furnish its explanation through ASMT-11.

Should I pay a GSTR-3B vs GSTR-2B mismatch immediately?

Not without first reconciling the figures. If the discrepancy is genuine, appropriate correction/payment may be required. If it results from incomplete or incorrect system data, submit the supporting reconciliation.

What is the biggest precaution before filing GSTR-3B?

Never rely solely on a portal summary figure. Maintain invoice-level reconciliation among the purchase register, GSTR-2A, GSTR-2B and GSTR-3B so that any later mismatch can be explained with evidence.

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