Input tax credit: why GSTR-2B decides what you can claim

Short answer: holding a valid tax invoice does not entitle you to input tax credit. Since 1 January 2022, Section 16(2)(aa) requires the invoice to have been reported by your supplier — in practice, to appear in your GSTR-2B. And three further rules can remove credit even after you have validly claimed it.

This is where most GST money is actually lost, and it is lost quietly.

The conditions in Section 16(2)

All must be satisfied. Failing any one denies the credit:

The second condition is the one that changed the game. Before January 2022 there was a provisional-credit mechanism under Rule 36(4) that allowed a percentage of unmatched credit — 20%, then 10%, then 5%, and finally nil from 1 January 2022. It is now statutory: no GSTR-2B, no credit.

The important consequence: a supplier's failure is your loss. You paid them the tax; if they did not report the invoice, the credit sits with nobody. Your commercial remedy is against the supplier, but the GST position is settled against you.

GSTR-2A is not GSTR-2B

These are used interchangeably in conversation and they are not the same thing.

• GSTR-2A is dynamic. It keeps updating as suppliers file, so the same period shows different figures depending on when you open it.
• GSTR-2B is static. It is generated once for a period and frozen.

Because it does not move, GSTR-2B is what the statutory condition operates on and what reconciliation must be done against. Reconciling to 2A produces a figure that will not match what the department sees later.

The three ways credit disappears after you claim it

Satisfying Section 16(2) is not the end of it.

1. The 30 November cut-off — Section 16(4). Credit for invoices of a financial year cannot be taken after 30 November of the following financial year, or the date of filing the annual return for that year, whichever is earlier. Miss it and the credit is gone permanently, regardless of the invoice being valid and appearing in 2B.

2. Supplier non-payment — Rule 37A. If your supplier has not filed their GSTR-3B for the relevant period by 30 September of the following year, you must reverse the credit by 30 November. Their compliance failure becomes your reversal, months after you legitimately claimed it.

3. Non-payment to the supplier within 180 days — Rule 37. If you have not paid the supplier within 180 days of the invoice date, the credit must be reversed. It can be re-availed when you pay. This catches businesses that stretch creditors — the working-capital gain is offset by a credit reversal.

Rule 37A deserves particular attention because it is outside your control and arrives late. You can do everything right and still face a reversal because a supplier stopped filing two quarters after invoicing you.

Why this has to be monthly

The timing asymmetry is the whole argument for a monthly cycle rather than a year-end exercise.

A mismatch found in the month it arises is usually fixable: you contact the supplier, they report the invoice in a subsequent period, and the credit becomes available while you are still inside the 30 November window.

The same mismatch found at year end is usually a permanent loss. The window has closed or is about to, the supplier has less incentive to correct a stale period, and there is no mechanism to claim credit that never appeared.

That is not an argument for more paperwork. It is that the remedy has a shelf life, and the shelf life is measured from the invoice, not from when you get round to checking.

The mismatch intimations you may receive

The department now automates the comparison and issues intimations before any formal notice:

• DRC-01B — where your GSTR-1 output liability exceeds what you declared in GSTR-3B (Rule 88C).
• DRC-01C — where the credit claimed in GSTR-3B exceeds GSTR-2B (Rule 88D).

These are intimations requiring an explanation or payment, not demands. But leaving one unanswered is what converts it into scrutiny under ASMT-10 and then a show-cause notice. They should be treated as the early warning they are — the wider notice framework is on the tax notices page.

One piece of relief, for old years only

For financial years 2017-18 to 2020-21, Section 16(5) — inserted with retrospective effect — treats credit as validly taken if it was claimed in a return filed up to 30 November 2021. That resolved a very large volume of disputes arising from the shorter time limit that previously applied to those years.

It is specific to those years. It does not extend the current 30 November cut-off, and it should not be read as a general relaxation.

What good reconciliation actually looks like

1. Pull GSTR-2B for the period — not 2A.
2. Match against the purchase register, invoice by invoice, not on totals.
3. Split the gaps: in your books but not in 2B (chase the supplier now), and in 2B but not in your books (unrecorded purchase, or a wrong GSTIN used by someone else).
4. Check ineligible credit under Section 17(5) has not been claimed by default.
5. Track the 180-day ageing on unpaid supplier invoices.
6. Only then claim, and file.

The full monthly cycle, the return calendar and registration thresholds are on the GST registration and return filing page. Where old periods are involved, note also that returns are now time-barred after three years — which can remove the ability to regularise a period at all.

Two situations sit outside the ordinary matching rules. Where inputs are taxed higher than the output, credit accumulates and the way out is a refund — see the inverted duty structure refund. Where the spend is construction, Section 17(5) blocks the credit outright in most cases — see ITC on factory construction.

This note sets out the general position on input tax credit conditions and reversals. Whether particular credit is available depends on your documents, your supplier's compliance and the periods involved, and should be confirmed against them.