Does GSTR-2B generated on the 14th change automatically if I take action in IMS on the 16th?

No. The GSTR-2B generated on the 14th is a draft snapshot. If you take or edit actions in IMS after the 14th, you must manually click 'Re-compute GSTR-2B' on the GST portal before filing GSTR-3B.

Should I Reject blocked credits (e.g. food, motor vehicles under Sec 17(5)) in IMS?

No! Do not reject valid supplier bills in IMS just because credit is blocked under Section 17(5). Accept them (or allow deemed acceptance) so they flow into GSTR-2B, and then report them as Ineligible ITC under Table 4B(1) of GSTR-3B.

What happens to Table 4A(5) of GSTR-3B if I mark an invoice as 'Pending' in IMS?

Pending invoices are completely excluded from the current month's GSTR-2B. Consequently, their tax values will not auto-populate in Table 4A(5) of GSTR-3B, deferring your ITC claim until you accept them in a future month.

Why is GSTR-3B hard-locked against GSTR-2B figures?

To prevent tax leakage, CBIC enforces strict validation between GSTR-2B and GSTR-3B Table 4. Claiming ITC in excess of GSTR-2B without valid IMS acceptance triggers system warnings and potential DRC-01C notices.

IMS Impact on GSTR-2B & GSTR-3B ITC Reconciliation (2026)

Quick Answer: How Does IMS Impact GSTR-2B and GSTR-3B ITC Claims?

IMS acts as an active gatekeeper between your supplier's GSTR-1 and your GSTR-2B. Only invoices marked as 'Accepted' (or 'Deemed Accepted' via inaction) flow into your GSTR-2B eligible ITC section and auto-populate Table 4 of GSTR-3B. Rejected or Pending invoices are excluded from current GSTR-2B calculations.

Dynamic GSTR-2B: GSTR-2B is no longer static; actions in IMS dynamically determine ITC.
Deemed Acceptance: Inaction automatically defaults to Accepted, pushing credit to GSTR-3B.
Section 17(5) Rule: Valid blocked credit bills must be Accepted in IMS, then disclosed in 4B(1).
Re-compute Requirement: Any IMS action taken after the 14th requires clicking 'Re-compute GSTR-2B'.

1. The Shift: Passive GSTR-2B Pull vs Active IMS Governance

Prior to the implementation of the Invoice Management System (IMS), GSTR-2B was a static, read-only PDF/JSON file generated on the 14th of every month. Taxpayers could only perform post-facto reconciliation in Excel or accounting software like Tally.

Under the current 2026 GST framework, IMS acts as a active gatekeeper layer. Supplier filings in GSTR-1, GSTR-1A, and IFF do not enter GSTR-2B directly. Instead, they land in the recipient's IMS dashboard, where actions (Accept, Reject, Pending) directly govern the auto-population of GSTR-3B Table 4.

2. Invoice Flow: From Supplier GSTR-1 to GSTR-3B Table 4

Supplier Action	Recipient IMS Action	GSTR-2B Status	GSTR-3B Table 4 Placement
Saves bill in GSTR-1 / IFF	Accept	Eligible ITC	Table 4A(5) - All Other ITC
Saves bill in GSTR-1 / IFF	No Action (Deemed)	Eligible ITC (Default)	Table 4A(5) - All Other ITC
Saves bill with wrong GSTIN	Reject	Excluded	Not Included (Blocked)
Goods in transit (Delivered next mth)	Pending	Deferred	Not Included (Carried Forward)
Valid bill for Blocked Item (Sec 17(5))	Accept	Ineligible ITC	Table 4B(1) - As per Sec 17(5)

Never Misclassify IMS Purchases in Tally Prime

Eliminate human typing errors that cause artificial GSTR-2B mismatches.

When accounting staff manually type vendor invoices into Tally, typos in invoice numbers or date formats prevent Tally's auto-matching engine from recognizing supplier entries in IMS.

TrulyInvoice AI Solution: Extract invoice numbers, HSN totals, and tax breaks from supplier PDFs. Sync verified F9 Purchase Vouchers directly into Tally Prime in 15 seconds via Port 9000 local connector.

Critical Compliance Note: Section 17(5) Blocked Credits

A common mistake among accountants is selecting Reject in IMS for invoices containing blocked input tax credit (e.g., motor vehicles, food & catering, employee insurance under Section 17(5)).

Correct Procedure: If the supplier legitimately provided the goods/services to your business, Accept the invoice in IMS. It will flow into GSTR-2B, and you must disclose it under Table 4B(1) (Ineligible ITC as per Section 17(5)) in your GSTR-3B return. Rejecting valid bills causes accounting discrepancies for the supplier.