Key Takeaways
- The Invoice Management System (IMS) became mandatory for all GST-registered taxpayers from April 1, 2026.
- IMS allows you to accept, reject, or keep invoices pending before they flow into GSTR-2B.
- If you take no action on an invoice, it is automatically accepted and flows into your GSTR-2B.
- The GST portal now enforces hard blocks on ITC claims where invoices are not reflected in GSTR-2B.
The Invoice Management System on the GST portal is no longer optional. From April 1, 2026, every GST-registered business must use IMS to manage inward supplies before filing GSTR-3B.
If you have been ignoring the IMS tab on the GST portal, that approach will now cost you. Here is how IMS works, what actions you need to take, and what happens if you do not.
Looking for expert help with IMS Invoice Management System setup and GST compliance services? The team at TaxGarden helps Indian SMEs stay compliant end-to-end — filings, notices, and advisory, all in one place.
What IMS Does
IMS is a feature on the GST portal that gives you control over which supplier invoices flow into your GSTR-2B (and therefore, which ITC you can claim).
Previously, all invoices reported by your suppliers in their GSTR-1 automatically appeared in your GSTR-2B as available ITC. You had no way to dispute or reject an invoice at the portal level before it entered your ITC statement.
With IMS, you now review each inward invoice and decide its status before GSTR-2B is generated.
The 3 Actions in IMS
When you log in to the GST portal and navigate to the IMS section, you will see all invoices reported by your suppliers. For each invoice, you have three options:
1. Accept
Confirming that the invoice is legitimate, you received the goods or services, and you want to claim ITC on it. Accepted invoices flow into GSTR-2B Table 3 (ITC Available).
2. Reject
The invoice is incorrect, disputed, or you did not receive the supply. Rejected invoices do not flow into your GSTR-2B. The supplier is notified of the rejection and can take corrective action (amend or cancel the invoice in their GSTR-1).
3. Keep Pending
You are not sure about the invoice and need time to verify. Pending invoices are held and do not appear in GSTR-2B for that period. They remain in IMS for action in a future period.
How Non-Action Works
This is critical: if you do not take any action on an invoice in IMS, the system treats it as accepted by default. The invoice will automatically flow into your GSTR-2B as available ITC.
This means:
- If a supplier files a fake invoice against your GSTIN and you do not reject it in IMS, it appears as your available ITC
- If there is an amount mismatch and you do not flag it, the supplier's figure flows through
- If you received goods but the invoice details are wrong, the wrong details become part of your ITC record
Ignoring IMS is the same as accepting everything your suppliers report.
Step-by-Step: How to Use IMS
Step 1: Log In and Navigate to IMS
Log in to the GST portal (gst.gov.in) with your credentials. Go to Returns, then select Invoice Management System (IMS).
Step 2: Review the Invoice List
IMS shows all invoices reported by your suppliers in their GSTR-1 for the current period. Each invoice shows:
- Supplier GSTIN and name
- Invoice number and date
- Taxable value
- IGST, CGST, SGST, and cess amounts
- Place of supply
Step 3: Match Against Your Records
Compare each invoice in IMS against your purchase register or accounting records:
- Does the invoice number match?
- Is the amount correct?
- Did you actually receive the goods or services?
- Is the GST rate applied correctly?
Step 4: Take Action
For each invoice:
- Click Accept if everything matches
- Click Reject if the invoice is wrong, fake, or disputed
- Click Pending if you need more time to verify
Step 5: Complete Before GSTR-2B Generation
GSTR-2B is generated on the 14th of each month (for monthly filers). Complete all IMS actions before this date. Any invoice left without action will be auto-accepted.
Step 6: Verify GSTR-2B
After GSTR-2B is generated, review it to confirm that:
- Accepted invoices appear in Table 3 (ITC Available)
- Rejected invoices do not appear
- Pending invoices are excluded from this period
Looking for expert help with monthly IMS management and GSTR-2B reconciliation services? The team at TaxGarden helps Indian SMEs stay compliant end-to-end — filings, notices, and advisory, all in one place.
Impact on ITC Claims
IMS directly controls your ITC. The relationship is straightforward:
| IMS Action | GSTR-2B Impact | ITC Impact |
|---|---|---|
| Accept | Appears in ITC Available | Can be claimed in GSTR-3B |
| Reject | Excluded from GSTR-2B | Cannot be claimed |
| Pending | Excluded for this period | Can be claimed in future period after acceptance |
| No Action | Auto-accepted into ITC Available | Can be claimed (but may include errors) |
With the GST portal now enforcing hard blocks on ITC claims exceeding GSTR-2B, your IMS actions directly determine whether your GSTR-3B filing goes through.
Common Mistakes to Avoid
1. Not Checking IMS at All
Many businesses have been ignoring IMS since it was introduced. Now that it is mandatory and directly affects GSTR-2B, skipping IMS review means accepting every invoice blindly.
2. Bulk Accepting Without Verification
Some businesses accept all invoices without matching against their records. This can lead to accepting fraudulent invoices, which may trigger GST audit scrutiny.
3. Missing the GSTR-2B Deadline
IMS actions must be completed before the 14th of each month. If you act on invoices after GSTR-2B is generated, the changes apply to the next period, not the current one.
4. Not Following Up on Rejected Invoices
When you reject an invoice, the supplier sees the rejection. But if neither party follows up, the invoice remains in limbo. Coordinate with your supplier to issue a corrected invoice or credit note.
5. Ignoring Auto-Accepted Invoices
Review the auto-accepted invoices in GSTR-2B. If any of them should have been rejected, you will need to reverse the ITC in a future GSTR-3B filing, which is more complicated than rejecting upfront.
IMS and the Zero Mismatch Policy
The Zero Mismatch Policy (effective April 2026) blocks GSTR-3B filing if ITC claimed exceeds GSTR-2B. IMS is the first line of defense:
- By actively managing IMS, you ensure GSTR-2B accurately reflects only legitimate ITC
- This makes GSTR-3B preparation straightforward since you are working with verified data
- Rejecting wrong invoices in IMS prevents them from inflating your GSTR-2B, which could cause confusion during filing
Think of IMS as the input control and the Zero Mismatch Policy as the output check. Managing IMS properly prevents filing blocks at the GSTR-3B stage.
Timeline for Monthly IMS Workflow
| Date | Action |
|---|---|
| 1st to 11th | Suppliers file GSTR-1, invoices appear in your IMS |
| 1st to 13th | Review and take action on all invoices in IMS |
| 14th | GSTR-2B auto-generated based on IMS actions |
| 14th to 20th | Prepare and file GSTR-3B using GSTR-2B data |
| 20th | GSTR-3B filing deadline (monthly filers) |
Let TaxGarden Manage Your IMS
Reviewing every inward invoice monthly, matching against your books, and taking timely IMS actions requires consistent effort. TaxGarden's Compliance Standard plan includes IMS management, GSTR-2B reconciliation, and GSTR-3B filing every month.
Frequently Asked Questions
Is IMS mandatory for all GST-registered taxpayers?
Yes, from April 1, 2026, IMS is mandatory for all regular GST-registered taxpayers who file GSTR-3B. Composition scheme taxpayers are not required to use IMS.
What happens if I reject an invoice in IMS?
The rejected invoice does not flow into your GSTR-2B, and you cannot claim ITC on it. The supplier is notified of the rejection and can amend or cancel the invoice in their GSTR-1.
Can I change my IMS action after GSTR-2B is generated?
No. Once GSTR-2B is generated on the 14th, the actions for that period are locked. You can take action on pending invoices in the next period.
What if a supplier files a fake invoice against my GSTIN?
Reject the invoice immediately in IMS. This prevents it from appearing in your GSTR-2B. If fake invoices persist, report the matter to your jurisdictional GST officer.
Does IMS apply to import transactions?
No. Import ITC is based on the Bill of Entry and ICEGATE data, which flows directly into GSTR-2B. IMS only applies to domestic inward supplies reported by suppliers in GSTR-1.
