The Invoice Management System (IMS) on the GST portal is no longer a feature you can ignore. It is now a mandatory part of every GST-registered business's monthly workflow.
For most Indian SMEs, this means adding a new step to your routine that did not exist before. If you miss it, your GSTR ThreeB filing gets blocked. Here is what your new workflow looks like.
Before IMS: How Your GST Workflow Used to Work
The old process was straightforward:
- Receive invoices from suppliers
- Record purchases in your books
- At month-end, total up your ITC
- File GSTR ThreeB with ITC figures from your books
- If there was a mismatch with GSTR TwoB, deal with it later
This "file first, reconcile later" approach worked because the portal allowed ITC claims that exceeded GSTR TwoB. You might get a DRC-01C notice, but filing was never blocked.
After IMS: Your New Monthly Workflow
Step-by-Step Guide
New Monthly GST Workflow Under IMS
Every regular GST taxpayer must complete these steps each month to avoid a blocked GSTR ThreeB filing
Record Purchase Invoices (Week 1:2)
Continue entering supplier invoices in your accounting software as usual. No change to your bookkeeping process at this stage.
No changeReview IMS on GST Portal (by 13th)
Log in to the GST portal and open IMS. For each supplier invoice, choose Accept (correct, ITC claimed), Reject (wrong or disputed), or Pending (needs verification). Unactioned invoices are auto-accepted.
New stepGSTR TwoB Auto-Generated 14th)
The portal generates GSTR TwoB based on your IMS actions. Accepted invoices appear as available ITC; rejected and pending invoices are excluded.
Auto on 14thPrepare GSTR ThreeB Using GSTR TwoB Data 15th:19th)
Your ITC figures in GSTR ThreeB must match GSTR TwoB. If you claim more ITC than GSTR TwoB shows, the portal blocks submission.
Critical checkFile GSTR ThreeB (by 20th)
Submit your return with reconciled ITC figures. Filing is only possible when ITC claimed does not exceed GSTR TwoB.
Due 20thSource: GST IMS Guidelines : GSTN Portal, 2026
The workflow has fundamentally changed:
Week 1-2: Receive and Record Invoices
Continue recording purchase invoices in your accounting software as usual. No change here.
By the 13th: Review IMS on the GST Portal
This is the new step. Log in to the GST portal and open the IMS section. You will see every invoice your suppliers have reported in their GSTR One.
For each invoice, decide:
- Accept: The invoice is correct, you received the supply, you want the ITC. This is the most common action.
- Reject: The invoice is wrong, disputed, or you never received the supply. The supplier gets notified.
- Pending: You need more time to verify. The invoice is excluded from this month's GSTR TwoB.
14th: GSTR TwoB Auto-Generated
On the 14th, the system generates your GSTR TwoB based on your IMS actions. Accepted invoices appear as available ITC. Rejected and pending invoices are excluded.
Any invoice you did not act on is auto-accepted and included.
15th-19th: Prepare GSTR ThreeB
Your GSTR ThreeB ITC figures must now match GSTR TwoB. Prepare your return using the auto-populated data. If you try to claim more ITC than GSTR TwoB shows, the portal blocks submission.
20th: File GSTR ThreeB
Submit your return with reconciled ITC figures.
What This Means for a Typical Small Business
If You Have 10-20 Suppliers
You will review 10-20 invoices in IMS each month. This takes about 15-30 minutes if your records are organized.
If You Have 50-100 Suppliers
Reviewing 50-100 invoices manually takes 1-2 hours. Consider using accounting software that integrates IMS review into your purchase workflow.
If You Have 100+ Suppliers
Manual IMS review is not practical. You need software-assisted reconciliation or a compliance service like Tax Garden to manage IMS actions on your behalf.
The Real Problem: Supplier Non-Filing
The biggest operational challenge with IMS is not the review process itself. It is dealing with suppliers who do not file GSTR One on time.
If your supplier has not filed GSTR One, their invoices do not appear in your IMS at all. You have the invoice in your books, you paid the GST, but the system does not recognize your ITC.
What You Cannot Do
- You cannot manually add the invoice to IMS
- You cannot override the system and claim ITC anyway
- You cannot file GSTR ThreeB with ITC that exceeds GSTR TwoB
What You Can Do
- Follow up with the supplier and request immediate GSTR One filing
- Claim the ITC in a future period once it appears in GSTR TwoB
- Track all unmatched invoices in a separate register
- Consider adding GSTR One filing compliance as a clause in supplier agreements
Auto-Accept: The Hidden Risk
When you do not take any action on an invoice in IMS, the system auto-accepts it. This sounds convenient but creates two risks:
Risk 1: Fake Invoices
If a supplier (or someone misusing a GSTIN) files a fake invoice against your GSTIN, it will auto-accept into your GSTR TwoB. You will have ITC you did not earn, which can trigger audit scrutiny or demand notices.
Risk 2: Incorrect Amounts
If a supplier reports the wrong taxable value or tax amount, the incorrect figure flows into your GSTR TwoB. When you file GSTR ThreeB with different numbers from your books, the portal blocks filing.
Both risks are avoided by actively reviewing IMS every month.
How IMS Connects to Other GST Changes
IMS does not exist in isolation. It is part of a broader enforcement framework:
Practical Tips for SME Owners
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Set a calendar reminder for the 10th of every month to review IMS. Do not wait until the 13th.
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Keep your purchase register up to date in real time, not at month-end. You need it ready when IMS review time comes.
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Build a supplier compliance tracker. Record which suppliers file GSTR One on time and which are consistently late. This helps you prioritize follow-ups.
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Do not ignore pending invoices indefinitely. If an invoice has been pending for 2 or more months, either accept it (if verified) or reject it. Pending invoices accumulate and create confusion.
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Train your accountant on IMS. Many accountants are still filing GSTR ThreeB based on book figures alone. They need to incorporate IMS review into their process.
Common Questions from SME Owners
Many business owners are encountering IMS for the first time. The most frequent concerns:
"I did not change anything in my business. Why is filing suddenly harder?" The GST system evolved. IMS was introduced to reduce fraudulent ITC claims, but it also adds compliance overhead for legitimate businesses. The requirement applies equally to all regular taxpayers.
"Can my CA handle IMS for me?" Yes. Your CA or accountant can log in to the GST portal and manage IMS actions on your behalf. Many CAs are now offering IMS management as part of their monthly GST filing service.
"What if I accidentally reject a valid invoice?" The rejection is communicated to the supplier. They can check with you and, if the rejection was a mistake, you can accept the invoice in the next period when it reappears in IMS.
Let Tax Garden Manage Your IMS Workflow
IMS adds a monthly compliance step that requires invoice-by-invoice verification. Tax Garden's Compliance Standard plan includes IMS management, GSTR TwoB reconciliation, supplier follow-up, and GSTR ThreeB filing.
Frequently Asked Questions
Is IMS mandatory for composition scheme taxpayers?
No. IMS is mandatory only for regular GST taxpayers who file GSTR ThreeB. Composition scheme taxpayers are exempt from IMS.
Can I use IMS on mobile?
The GST portal is accessible on mobile browsers, but the IMS interface is optimized for desktop use. For reviewing large numbers of invoices, a desktop or laptop is recommended.
What happens to pending invoices at year-end?
Pending invoices carry forward to the next period. They remain in IMS until you accept or reject them. They are not automatically cleared at year-end.
Does IMS apply to import transactions?
No. Import ITC is based on the Bill of Entry and ICEGATE data, which flows directly into GSTR TwoB. IMS applies only to domestic inward supplies from registered suppliers.
How do I know if a supplier has filed GSTR One?
If the supplier's invoices appear in your IMS, they have filed GSTR One for that period. If invoices are missing, the supplier has not filed. You can also check supplier filing status using the GST portal's Search Taxpayer feature.
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Frequently Asked Questions: Tax Services in Kondapur & Hyderabad
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