GSTR-2B vs Books: The Monthly Reconciliation Discipline That Prevents ITC Notices

Most input tax credit disputes are not disputes about law. They are disputes about arithmetic that nobody reconciled at the time, surfacing two or three years later when the difference has become large, the supplier has become unreachable, and the working papers that would have explained it were never made.

The discipline that prevents this is unglamorous and takes an hour a month. This is how it is done.

1. Why GSTR-2B is the right statement to reconcile against

GSTR-2A and GSTR-2B are not alternatives. GSTR-2A is dynamic — it updates whenever a supplier files or amends, so the same period shows different figures on different days and cannot be used as a fixed basis for a claim. GSTR-2B is static. It is generated for a tax period, it does not change afterwards, and it segregates credit into eligible and ineligible.

That static quality is what makes it the reconciliation anchor. A credit claim supported by a GSTR-2B for the period can be defended years later by regenerating the same statement. A claim supported by a GSTR-2A cannot, because the statement will have moved.

2. The conditions the reconciliation is actually testing

Section 16 of the Central Goods and Services Tax Act, 2017 sets conditions that operate cumulatively. Credit is available only where:

• A tax invoice or debit note has been issued by a registered supplier
• The details of that document have been furnished by the supplier in his outward statement and communicated to the recipient — the condition in clause (aa) of Section 16(2), which is what GSTR-2B evidences
• The goods or services have actually been received
• The tax charged has in fact been paid to the Government
• The recipient has furnished the return under Section 39

Two further limits apply. The second proviso to Section 16(2) requires the recipient to pay the supplier the value of supply and tax within 180 days of the invoice date, failing which the credit is added to output tax liability with interest, and may be reclaimed on later payment. And Section 16(4) closes the window: credit for a financial year cannot be taken after 30 November following the end of that year, or the date of furnishing the annual return, whichever is earlier.

3. The four buckets

Set the books against GSTR-2B for the period and place every line into one of four categories. This is the entire method.

The third bucket is where money is lost. A credit that sits unreported by the supplier is not a dispute with the department — it is a commercial matter with a supplier who has been paid tax and has not passed it on. It is far easier to resolve while the relationship is live and the payment is recent.

4. The differences that recur

Across engagements, the same handful of causes account for most of the reconciliation gap:

• The supplier reported the supply against the wrong GSTIN — common where a group has registrations in several states
• The supplier treated a business-to-business supply as business-to-consumer, so it never reaches your statement
• Credit notes issued by the supplier and not recorded by the recipient, leaving credit claimed on a value since reduced
• Supplies liable to reverse charge, recorded as ordinary purchases
• Import IGST, which reaches GSTR-2B from customs data and is frequently reconciled against the wrong period
• Credit distributed by an input service distributor, recorded at the branch before it is distributed
• Timing — an invoice dated at a month end, reported by the supplier in the following period

Timing differences are not errors. They should be identified as timing differences, listed separately, and cleared in the following month. What must not happen is that a timing difference is written off as a permanent one and quietly abandoned.

5. What the department now does automatically

Rule 88D of the Central Goods and Services Tax Rules provides for system-generated intimation where credit availed in the return in Form GSTR-3B exceeds the credit available in Form GSTR-2B by the prescribed margin. The intimation is issued in Part A of Form DRC-01C. The registered person must either pay the difference with interest, or explain it in Part B, within the period prescribed. Failure to do either can restrict the filing of the subsequent outward statement.

The practical consequence is that the reconciliation is no longer optional or private. If it is not performed internally, it is performed by the system and returned as an intimation with a clock attached.

A reconciliation is not the schedule. It is the explanation of every line on the schedule that does not agree.The AKV working rule

6. What the working paper should contain

A reconciliation that cannot be produced later is of limited defensive value. For each period, retain: the GSTR-2B as generated; the credit ledger from the books; the four-bucket schedule; a note on each item in buckets two, three and four naming the cause and the action; and the carry-forward of unresolved items into the following month. Where credit has been deferred because the supplier has not reported, that decision and its date should be visible.

At the year end this file becomes the substantiation for Table 8 of the annual return in Form GSTR-9, and for the reconciliation statement in Form GSTR-9C where applicable. Firms that keep it monthly complete the annual return in days. Firms that do not, spend a quarter rebuilding it.

This article is general commentary on the law as it stands and is not advice on any specific facts. Positions in tax, corporate and exchange-control law change with amendments, notifications and judicial decisions; please confirm the current position with the firm before acting.