Input Tax Credit is the single biggest lever in your GST cost — and the single biggest source of notices. Credit is denied not because businesses are dishonest, but because their books say one thing and GSTR-2B says another. This guide explains what you can actually claim in 2026, why 2B (not 2A) now governs, and how a monthly reconciliation keeps your credit safe.
What ITC is, and the four conditions
ITC lets you set the GST you pay on purchases against the GST you collect on sales. But the credit is conditional. To claim it you broadly need all of the following:
- You hold a valid tax invoice (or debit note).
- You have received the goods or services.
- The supplier has actually paid the tax and reported the invoice, so it appears in your GSTR-2B.
- You have filed your return and paid the supplier within the prescribed time.
Miss any one and the credit is at risk — most often the third, which is entirely in your supplier’s hands.
GSTR-2A vs GSTR-2B: the real difference
This confuses even finance teams, so here it is plainly:
- GSTR-2A is dynamic — it keeps changing as suppliers file late. It is a live picture, useful for tracking, but not the basis of your claim.
- GSTR-2B is static — generated once a month, frozen. It is the official statement of credit available to you for that period.
Claim against 2B, reconcile with 2A. Businesses that still claim “as per books” are the ones who get ASMT-10 and DRC-01 notices.
ITC is the single place I see real money leak, every month, in businesses that think their GST is “handled.” The rules changed quietly: your credit is no longer what your books say — it is what your vendor uploaded. So a defaulting supplier is now your cash-flow problem, not theirs. The fix is unglamorous and it works: reconcile 2B against your purchase register every month, and chase the missing uploads while the vendor still takes your call.
— Hardik Garg, Founder & Senior Advisor
Not sure your ITC is safe?
We run a full 2A/2B reconciliation, flag the credit at risk, and chase the vendors who have not uploaded — so the department finds nothing to pick at.
The reconciliation that protects your credit
A monthly ITC reconciliation is the cheapest insurance you can buy. Each month, line up three things:
- Credit as per your books (purchase register).
- Credit as per GSTR-2B.
- Credit actually claimed in GSTR-3B.
Every difference should have a label: invoice not uploaded by vendor, timing difference, wrong GSTIN, ineligible credit, or duplicate. A reconciliation without reasons is just a spreadsheet; one with reasons is a defence file.
Reversals that catch businesses out
Even validly claimed credit sometimes has to be reversed:
- Non-payment to supplier within 180 days — credit must be reversed and re-claimed when paid.
- Common credits used for both taxable and exempt supplies — apportioned under Rules 42/43.
- Credit notes issued by suppliers that reduce your eligible credit.
- Goods written off or lost.
Tracking these through the year avoids a painful year-end true-up — and the interest that comes with reversing late.
Credit you simply cannot claim
Section 17(5) blocks certain credits outright. Common blocked items include:
- Motor vehicles (with specific exceptions) and related insurance/repairs.
- Food and beverages, outdoor catering, club memberships, unless onward-supplied.
- Goods or services for personal consumption.
- Most works-contract and construction credit for immovable property on own account.
Claiming blocked credit by mistake is a frequent — and avoidable — notice trigger.
The vendor problem (and how to manage it)
Your credit depends on suppliers you do not control. To manage that risk:
- Track vendor filing behaviour and flag chronic late-filers.
- Build a credit-linked payment practice — hold the GST portion until the invoice appears in 2B, where commercially possible.
- Send monthly mismatch reminders to vendors with gaps.
Want ITC handled every month, not at year-end?
Our compliance desk files your returns with a full reconciliation built in and chases the vendors who did not upload.
The bottom line
2A is the live feed; 2B is the locked statement your ITC is actually measured against. Treat the monthly 2B-versus-purchase-register reconciliation as non-negotiable: claim what is reflected, park what is not, and chase the vendors holding up your credit. The businesses that never have an ITC problem are simply the ones that reconcile every month instead of discovering the gap in an annual return or a notice.