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Input Tax Credit (ITC) Rules Every Small Business Must Know

ITC is the heart of GST. Four conditions, blocked credits and the 180-day payment rule explained simply.

24 April 2026 7 min readBy SmartGST Team
Input Tax Credit (ITC) Rules Every Small Business Must Know

Four conditions under Section 16

You hold a valid tax invoice; you have received the goods or services; the supplier has reported it (appears in GSTR-2B) and paid tax; and you have filed your return.

Blocked credits under Section 17(5)

Motor vehicles for personal use, food and beverages, club memberships, works contracts for immovable property, goods for personal consumption, and free samples.

The 180-day rule

If you do not pay your supplier within 180 days of the invoice, reverse the ITC with interest; reclaim it when you pay.

Time limit

Claim ITC by 30 November following the financial year or the annual return date, whichever is earlier.

Keep the trail clean

Record every purchase bill in SmartGST and reconcile with GSTR-2B monthly so no eligible credit is missed.

Try it on your next invoice

SmartGST Invoices automates GST calculation, HSN codes, reminders and GSTR reports. Free to start.

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Keywords: input tax credit rules · itc blocked credit. This article is general information, not professional tax advice.