GST IMS Reconciliation Explained

ITC, from being a transactional benefit to compliance-driven entitlement, has evolved continuously, just as India's GST law does. It was very recently that an Invoice Management System, or IMS, came into existence, which basically altered how recipients interact with supplier invoices and how the eligibility of ITC is determined.

From the FY 2024–25 onwards, the GST IMS reconciliation is not an option. It is a statutory control mechanism that impacts directly:

1. Availability of ITC
2. GSTR-2B locking
3. Vendor compliance ratings
4. Audit exposure and litigation risk

For organizations already on SAP ERP, manual reconciliation is not scalable. This is where SAP-based GST Cockpits like SEPFUST's IMS Automation become critical.

This blog explains GST IMS reconciliation from a law, compliance, accounting, and SAP automation perspective.

What Is IMS In GST?

The Invoice Management System(IMS) is a Functionality given to the taxpayers by GSTN to allow taking actions on invoices uploaded by their suppliers in GSTR-1 / IFF before such invoices flow into GSTR-2B.

Key Goal of IMS

Providing the beneficiaries with control of the ITC through the facility of taking invoice-level actions prior to the credit crystallization.

What Actions are Available to the Recipient under the IMS?

A recipient can:

1. Accept an invoice → Eligible for ITC
2. Reject invoice → Ineligible (Incorrect GSTIN, fake bill, etc.)
3. Keep Pending → Temporarily blocked until clarified

After being acted upon, these invoices impact the final ITC to be displayed in GSTR-2B.

Legal Framework Governing GST IMS Reconciliation

Relevant Sections & Rules

Section 16 of CGST Act, 2017

ITC is available only if:

• Tax invoice is valid
• Goods/services are received
• Tax is paid to the Government
• Return is furnished

IMS operationalizes Section 16(2) by validating supplier compliance upfront.

Rule 36(4) of The CGST Rules

• ITC restricted to invoices appearing in GSTR-2B
• IMS ensures only accepted invoices flow to 2B

Section 38 – Communication of ITC

• IMS is the mechanism of communication and confirmation of ITC between supplier and recipient.

IMS Reconciliation vs Traditional GSTR 2B Reconciliation

"The IMS reconciliation process is therefore a form of preventive, not corrective

Real-life Scenarios for GST IMS Reconciliation

On the practical side from a CA’s experience, the following issues are faced by the enterprises:

1. Volume of Invoices

In fact, for large entities, thousands of invoices are handled monthly for different plants, GSTINs, and suppliers.

2. Errors in Supplier Master Data

Incorrect GSTIN

Wrong place of supply

3. Manual Portal Dependency

IMS actions presently demand that:

• Portal Login
• Invoice decision
• Manual tracking

This is not possible at a large scale.

4. SAP vs GSTN Data Mismatch

SAP documents invoices against:

• MIRO postings
• Vendor invoices

GSTN reflects:

• User uploads

Otherwise, the process will be prone to mistakes without

Why SAP-Based IMS Automation is so Important

For SAP-centric enterprises, IMS reconciliation has to occur in SAP, and not outside SAP.

Ideal IMS Reconciliation Flow

1. Supplier uploads invoice => GSTN
2. Invoice flows into IMS
3. Compare Invoice with SAP data
4. Auto decision (Accept / Reject / Pending)
5. Action Push to IMS
6. Input tax credit flows correctly into GSTR-2B

This is exactly what the SEPFUST SAP GST IMS Cockpit makes possible.

SEPFUST SAP GST IMS Cockpit-How Automation Works

1. IMS Invoice Fetch from GSTN

• Secure API pull of IMS Data
• GSTIN wise, time-wise
• Manual downloads are not allowed.

2. Intelligent Reconciliation with SAP

• IMS Invoices will be reconciled with:
• SAP MIRO / FB60 documents
• Vendor GSTIN
• Invoice number & date
• Taxable Value & Tax Breakup
• The taxable

Matching logic involves:

• Exact match
• Fuzzy match (invoicing numbering discrepancies)

3. Rule-Based Auto Decision Engine

It eliminates the possibility of human subjectivity

4. SAP-Based IMS Action Cockpit

Users can:

• Display IMS invoices within SAP systems.
• View reconciliation status
• Override decisions using Approval Workflow
• Ensure the audit trail continues
• Elimination of GST Portal dependence for day-to-day operations.

5. Action Push to GST Portal

• Accepted/Rejected/ Pending actions are pushed back to GSTN
• Facilitates correct generation of GSTR
• Precludes Excess or Ineligible ITC