GST Audit & Reconciliation

What is a GST audit and reconciliation?

A GST reconciliation matches what's in your books with what you've reported in your GST returns and what the GST portal shows — your sales in GSTR-1, tax paid in GSTR-3B, and supplier invoices in GSTR-2B. A GST audit, in the sense most businesses now need, is a structured review of that compliance, done internally or by an advisor before the department does it.

The department can also audit a registered business itself, under Section 65 of the CGST Act, or order a special audit by a CA or cost accountant under Section 66. Being reconciled beforehand is the best preparation for both.

The key terms

A handful of returns and processes are involved:

GSTR-1 and GSTR-3B

Your outward supplies return and your summary return with tax payment. They should agree with each other and with your books.

GSTR-2B

An auto-generated statement of input tax credit available from your suppliers' filings. Credit claimed should match it.

GSTR-9

The annual return, bringing together the year's figures. It's mandatory above a turnover threshold and optional below it.

GSTR-9C

The reconciliation statement between audited accounts and GSTR-9, for larger taxpayers. Since FY 2020-21 it's self-certified, no longer by a CA.

Departmental audit

An audit by GST officers under Section 65, started with notice in Form ADT-01, with findings communicated in ADT-02.

Special audit

An audit by a CA or cost accountant nominated by the department under Section 66, where the officer considers it necessary.

Mismatch notices

Notices raised when your returns don't match each other, your suppliers' data, or e-way bill and e-invoice data.

Why it matters

GST is increasingly enforced through data matching:

Automated mismatch detection

The GST system compares your returns with your suppliers' filings, e-invoices, and e-way bills. Differences trigger notices.

Credit at risk

Input tax credit not supported by GSTR-2B, or claimed on ineligible items, can be denied with interest and penalty.

Time limits

Credit and corrections have strict time limits. Reconciling regularly means you still have time to fix things.

Departmental audits

Officers audit selected businesses. A reconciled file makes the audit shorter and less contentious.

Annual return accuracy

GSTR-9 and GSTR-9C are built on the reconciliation. Errors there are hard to correct later.

Interest and penalties

Short payments found later carry interest from the original due date.

Books and returns agree

Auditors, tax auditors, and lenders expect GST turnover to reconcile with the financial statements.

Who is this for?

If you've already received a show-cause notice or demand, see our GST Notices, Adjudication & Appeals service.

The types of GST review

Different reviews serve different purposes:

What we'll need from you

Books of account

Sales and purchase registers, and the general ledger for the period.

GST returns

GSTR-1, GSTR-3B, and any annual returns filed.

Portal data

GSTR-2A and 2B downloads, e-invoice and e-way bill data.

Invoices and credit notes

Supporting documents for sample transactions and adjustments.

Audited accounts

The financial statements, for turnover reconciliation.

Notices

Any notices or audit communications received.

Reconciliation effort depends on the number of GSTINs, transaction volumes, and how many periods are covered.

How the review works

A GST reconciliation and review typically covers:

1. 1

   Collect data

   Books, returns, and portal data are collected for the period and each GSTIN.

2. 2

   Reconcile outward supplies

   Sales in the books are matched with GSTR-1, GSTR-3B, e-invoices, and e-way bills.

3. 3

   Reconcile input credit

   Credit claimed is matched with GSTR-2B and checked for eligibility.

4. 4

   Review tax positions

   Rates, classification, place of supply, and reverse charge are reviewed on a sample basis.

5. 5

   Report and correct

   Differences are explained, documented, and corrected where the law still allows.

6. 6

   Annual return

   GSTR-9 and, where required, GSTR-9C are prepared from the reconciled data.

If the department audits you

When officers issue an audit notice:

Notice in ADT-01

The department gives at least 15 working days' notice of an audit in Form ADT-01, usually listing documents to produce.

Produce records

Books, returns, and supporting documents are made available, at your premises or the tax office.

Explain differences

A prepared reconciliation answers most queries directly.

Findings in ADT-02

Officers communicate their findings, including any discrepancies, in Form ADT-02.

Pay or contest

Agreed amounts can be paid with interest; disputed ones may lead to a show-cause notice you can contest.

Keep records

Keep records for the statutory period — longer if they're involved in proceedings.

Benefits and responsibilities