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Blocked credits under 17(5): the ITC you can never claim

Arthora Guides · Updated August 2026 · 7 min read

Being in your GSTR-2B makes a credit available — it does not make it yours. Section 17(5) lists purchases whose GST you cannot claim no matter how genuine the invoice, and it is the favourite chapter of every audit because the errors sit in plain sight: the credit was in 2B, the software claimed it, nobody asked whether the law allowed it.

The blocked list, with its exceptions

BlockedUnless
Motor vehicles for transporting people (13 seats or fewer), and their insurance, repair and maintenanceYou deal in vehicles, transport passengers, or run driver training. Trucks and goods transport vehicles are not blocked.
Food and beverages, outdoor catering, beauty treatment, cosmetic surgery, health servicesYou are in the same business (a caterer buying catering), or the law obliges you to provide it to employees — e.g. a statutory canteen.
Club memberships, health and fitness centres—
Employee travel benefits (LTC/holiday travel)Statutory obligation, again.
Works contract services for immovable propertyIt is input for further works-contract supply, or the property is plant and machinery.
Construction on your own account — the office you build, the factory shedPlant and machinery, again. The building never earns credit; the machines inside it do.
Purchases from composition dealers, and goods/services for personal consumption—
Goods lost, stolen, destroyed, written off, or given as gifts and free samples— (this one bites at every year-end stock count)
CSR spending (blocked explicitly since 2023)—
Tax paid after fraud/seizure proceedings (sections 74, 129, 130)—

The two blocks businesses trip on most

1. The write-off block

When stock is destroyed, expires, or is written off at the year-end count, the ITC you claimed on buying it must be reversed. The purchase was legitimate, the credit was legitimate — the write-off is what changes its character. If your stock system and your GST workings are separate, this reversal simply never happens, and it is one of the first things a departmental audit recomputes.

2. The construction block

Renovating an office, building a godown, civil work in the factory — the GST on all of it is generally cost, not credit, and the invoices are big enough that claiming them wrongly creates a five-figure exposure from a single voucher. The dividing line is "plant and machinery" (machines, equipment, their foundations and supports) versus the immovable property around them.

Where the reversal actually goes

Blocked and reversed credits are reported in GSTR-3B Table 4(B) — you show the gross credit from 2B, then subtract the ineligible portion visibly. Netting it off silently ("we just didn't claim it") reconciles badly against 2B and invites questions the visible reversal would have answered. Interest applies when a blocked credit was claimed and utilised before being reversed — one more reason to catch it in the same month, not at the annual return.

💡 Make the decision at purchase entry, not at return time. The person entering a bill knows what it was for — lunch for the team, a car service, canteen catering, civil work. Tag the expense category as credit-eligible or blocked then, and the month-end reversal computes itself. Deciding at filing time means re-reading a month of vouchers, and skipping that re-read is how blocked credit gets claimed.
How Arthora ERP does this: expense categories carry their ITC treatment, so a bill booked to "Staff welfare — canteen" or "Building repairs" lands in the ineligible bucket the moment it is entered, and 3B's Table 4 shows gross credit, reversals and the eligible remainder with the vouchers behind each figure. Stock write-offs prompt the matching ITC reversal instead of leaving it to memory. See the GST module →
Credit decisions made once, at entry

Arthora ERP tracks eligible and blocked ITC from the voucher up — 2B reconciliation and 3B included. 7-day free trial, no card.

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