Last reviewed: 8 July 2026. Wrongly claimed input tax credit is one of the most common - and most expensive - GST errors, because it comes back with interest and penalty. Since ITC is now tied closely to your auto-generated GSTR-2B, a monthly reconciliation before you file GSTR-3B is essential. This guide sets out the seven checks that keep your ITC clean and defensible.
At a glance
The seven checks before you claim
- Valid documentation - a proper tax invoice or debit note for every credit.
- Appears in GSTR-2B - the supplier has filed and the invoice is reflected.
- Goods/services received - no credit on invoices for supplies not yet received.
- Not blocked - exclude Section 17(5) items like motor vehicles, food, club fees.
- 180-day payment - reverse ITC where the supplier is unpaid beyond 180 days.
- Proportionate reversal - apply Rules 42/43 for exempt or personal use.
- Within the time limit - claim by 30 November of the following year.
Why this matters
The department routinely compares ITC claimed in GSTR-3B against GSTR-2B and issues queries (often as an ASMT-10 scrutiny notice) on the difference. A disciplined monthly reconciliation - matching 2B to your purchase register and chasing non-filing suppliers - prevents reversals, interest and notices later.
Frequently asked questions
What are the conditions to claim input tax credit?
Under Section 16, you can claim ITC only if you have a valid tax invoice, the supplier has actually paid the tax and reported the invoice (so it appears in your GSTR-2B), you have received the goods or services, and you pay the supplier within 180 days.
Why must GSTR-3B match GSTR-2B?
ITC in GSTR-3B is now allowed largely on the basis of what appears in the auto-generated GSTR-2B. Credit claimed beyond 2B is a common reason for departmental queries and reversals.
What is blocked credit under Section 17(5)?
Certain credits are blocked - such as motor vehicles (with exceptions), food and beverages, club memberships, works contract for immovable property and personal-use goods. Claiming these by mistake leads to reversal with interest.
What is the 180-day payment rule?
If you do not pay the supplier within 180 days of the invoice date, the ITC claimed must be reversed with interest, and re-availed when you eventually pay.
When must ITC for a year be claimed by?
ITC for a financial year must be claimed by 30 November of the following year (or the annual return date, if earlier). Miss this and the credit lapses.
What about ITC on reverse charge?
RCM liabilities must be paid in cash first; the corresponding ITC can then be claimed, subject to eligibility. Reconcile RCM separately.
What are Rule 42 and 43 reversals?
Where inputs or capital goods are used partly for taxable and partly for exempt supplies or personal use, a proportionate ITC reversal is required under Rules 42 and 43.
How do I avoid ITC mismatches?
Reconcile GSTR-2B with your purchase register every month, follow up with suppliers who have not filed, exclude blocked credit, track the 180-day rule, and reverse proportionate credit where needed - before filing GSTR-3B.
We reconcile your GSTR-2B and purchase register monthly, flag blocked and risky credit, and file clean GSTR-3B returns.
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