GST Invoice Management System (IMS): Accept, Reject or Pending — Complete 2026 Guide

The Invoice Management System (IMS) is the biggest GST compliance change since e-invoicing. Live on the GST portal since October 2024 and now actively driving GSTR-2B from FY 2025-26, IMS lets every recipient accept, reject or keep pending each supplier invoice — and only accepted invoices flow into your Input Tax Credit (ITC). Here is what every business needs to do this month.

What is IMS and why it matters

Earlier, GSTR-2B was auto-generated from whatever suppliers reported in GSTR-1/IFF — you had no control. With IMS, the recipient becomes the gatekeeper. Three actions are possible against every inward invoice, credit note and debit note:

• Accept — invoice flows into GSTR-2B and ITC is available in GSTR-3B
• Reject — invoice is dropped from GSTR-2B; supplier must correct via GSTR-1A or next GSTR-1
• Pending — invoice is parked (cannot be kept pending beyond the time limit under Section 16(4))

No action = deemed accepted. So if you ignore IMS, every supplier invoice silently enters your ITC — including duplicates, wrong GSTINs and fake invoices that can trigger Section 74 notices later.

The new GSTR-2B → GSTR-3B flow

1. Supplier files GSTR-1 / IFF / GSTR-1A
2. Invoices land in your IMS dashboard on the GST portal
3. You accept / reject / keep pending before 14th of the next month
4. GSTR-2B is generated on the 14th based on your IMS actions
5. ITC auto-populates your GSTR-3B from the recomputed GSTR-2B

When to use each action

Accept

• Invoice matches your purchase register, GRN and 3-way match
• Supplier GSTIN is active, place of supply is correct, tax rates match

Reject

• Invoice does not belong to you (wrong GSTIN)
• Duplicate of an already-accepted invoice
• Goods/services never received or returned in full
• Supplier reported wrong tax amount and you do not want it in your 2B

Pending

• Goods in transit — invoice received but GRN not booked yet
• Awaiting credit note from supplier
• Reconciliation in progress at month-end

Caution: Pending invoices must be actioned before the Section 16(4) time limit (30th November of the following financial year or annual return date, whichever is earlier) — otherwise the ITC lapses permanently.

Credit notes under IMS — the trap

If a supplier issues a credit note and you reject it on IMS, the supplier's output tax liability increases in their next GSTR-3B. This means you cannot reject a genuine credit note just to retain ITC — it will create a mismatch and a notice. Always accept genuine credit notes and reverse the ITC.

Practical workflow for businesses

1. Daily / weekly reconciliation — don't wait till the 13th. Login to IMS, download the JSON, match against your purchase register
2. Use automation — most accounting tools (Tally, Zoho, ClearTax, our reconciliation engine) now sync IMS via GSP APIs and auto-suggest accept/reject
3. Communicate rejections to suppliers the same day — they need to amend via GSTR-1A before the 11th of the next month
4. Document everything — keep proof (email/screenshots) for every reject and pending action in case of audit

What changes in GSTR-3B

From FY 2025-26 onwards, Table 4 (ITC) in GSTR-3B is auto-locked from the recomputed GSTR-2B post-IMS. You cannot manually increase ITC — you can only reverse. This makes IMS hygiene non-negotiable.

Need help operationalising IMS? Our GST team handles end-to-end IMS actioning, GSTR-2B reconciliation and GSTR-3B filing from ₹299/month — see pricing or check our FY 2025-26 GST calendar. Estimate your monthly compliance cost with the GST calculator.