Rule 88D and GSTR-2B: What Every CA Must Know About ITC Mismatch Notices

If your client has availed ITC in GSTR-3B that exceeds what appears in GSTR-2B, the GST system will now flag it automatically and initiate a formal intimation. Rule 88D, introduced via Notification No. 38/2023-Central Tax dated 4 August 2023, operationalises exactly this kind of automated scrutiny. Here is what you need to understand before your client receives a DRC-01C notice and the clock starts ticking.

What Rule 88D Actually Does

Rule 88D creates a system-driven comparison between:

• ITC claimed in GSTR-3B for a given tax period
• ITC available as per GSTR-2B for the same period

When the claimed ITC exceeds the GSTR-2B figure beyond a specified threshold (verify the current threshold on the official GSTN portal), the system auto-generates Form DRC-01C Part A, intimating the taxpayer of the excess amount. This is not a demand notice yet, but it is a formal trigger with a hard response window.

The 7-Day Window You Cannot Miss

Once Part A of DRC-01C lands, the taxpayer has 7 days to either:

1. Pay the difference along with applicable interest, or
2. Explain the discrepancy through Part B of DRC-01C with supporting documentation

If neither action is taken within this window, the department is empowered to issue a notice under Section 73 or Section 74 of the CGST Act. Section 74 carries a penalty of up to 100% of tax dues if fraud or wilful misstatement is alleged. A passive response is not an option.

GSTR-2A vs GSTR-2B: The Distinction That Matters Here

This is where many professionals still trip up. GSTR-2A is dynamic. If a supplier files GSTR-1 for April in July, the ITC reflects in GSTR-2A of April. GSTR-2B is static. The same late-filed GSTR-1 will reflect in GSTR-2B of July, not April.

Rule 88D works off GSTR-2B, not GSTR-2A. So a client who availed ITC in April based on GSTR-2A but whose supplier filed late will show a mismatch in the Rule 88D comparison, even if the underlying invoice is genuine. This distinction is critical when drafting your Part B response.

Worked Example

Suppose your client avails ITC of Rs. 8,00,000 in GSTR-3B for August 2026. GSTR-2B for August 2026 shows only Rs. 6,50,000 because two suppliers filed their GSTR-1 late. The gap is Rs. 1,50,000.

If this gap crosses the system threshold, DRC-01C Part A is generated. Your client must respond within 7 days. If the supplier subsequently files and the Rs. 1,50,000 appears in GSTR-2B of September 2026, that is a valid explanation to submit in Part B. Attach the supplier's GSTR-1 filing acknowledgement and the invoice details. A well-documented Part B response closes the matter at the intimation stage itself, before it escalates to a Section 73/74 notice.

Practical Steps for Your Practice

• Reconcile monthly, not quarterly. Run a GSTR-2B vs GSTR-3B reconciliation before filing 3B every period. Catch mismatches before the system does.
• Build a supplier follow-up protocol. Late GSTR-1 filings by vendors are the single biggest source of these mismatches. A simple reminder workflow saves your client from DRC-01C notices.
• Document everything at the time of filing. If you knowingly avail ITC that is not yet in GSTR-2B because the invoice is valid, note the reason. When I reviewed a client's August reconciliation using Ruhu AI, the comparison flagged three vendors with consistent late filing patterns within minutes, which is the kind of early warning that makes Part B responses far easier to draft.
• Never ignore a DRC-01C. Even if the mismatch is