What is Input Tax Credit (ITC) in GST?

By the India Law Simplified editorial team · Verified against the bare Acts & official portals · Updated 2026-07-28 · ~4 min read

⚡ Quick answer

Input Tax Credit (ITC) lets a GST-registered business reduce the GST it owes on its sales by the GST it already paid on its business purchases. So you pay tax only on the value you add, not on the whole price. You can claim ITC only for invoices that appear in your auto-drafted GSTR-2B (which means the supplier filed their return and paid the tax), where the credit isn't blocked under Section 17(5), and within the time limit — generally 30 November of the year following the financial year.

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Input Tax Credit is the heart of how GST works — it's what stops tax from piling up on tax at every stage of the supply chain. For a business, ITC is real money: claim it correctly and your GST cost drops; claim it wrongly and you face reversal with interest and penalty. This guide explains, in plain language, what ITC is, how it's calculated with an example, the exact conditions to claim it, which credits are blocked, and the GSTR-2B matching rule that trips up most businesses.

1What ITC actually means

When you buy goods or services for your business, you pay GST on them. When you sell, you collect GST from your customers. Input Tax Credit lets you set the GST you paid (input tax) against the GST you collected (output tax), so you deposit only the difference with the government.

Without ITC, the same value would be taxed again and again as it moves through manufacturers, wholesalers and retailers — the very 'cascading' GST was designed to remove.

2How ITC is calculated — an example

Take a trader in one month:

GST collected on sales (output tax): ₹18,000
GST paid on purchases (input tax / ITC): ₹10,000
GST payable in cash = ₹18,000 − ₹10,000 = ₹8,000

💡 ExampleThe trader collected ₹18,000 GST but had already paid ₹10,000 GST to suppliers. By claiming that ₹10,000 as ITC, they deposit only ₹8,000 in cash. If they forgot to claim it, they'd pay the full ₹18,000 — losing ₹10,000 of their own money.

3The five conditions to claim ITC

You can claim ITC only if all of these are met (Section 16, CGST Act):

You have a valid tax invoice or debit note
You have actually received the goods or services
The supplier has paid the tax and filed their return — so the invoice shows in your GSTR-2B
You have filed your own GSTR-3B return
You claim it within the time limit (by 30 November of the next financial year, or filing the annual return, whichever is earlier)

⚠️ ImportantThe GSTR-2B rule is the big one: if your supplier hasn't uploaded the invoice and paid tax, you generally cannot claim that ITC — no matter that you hold a valid invoice and paid them in full.

4Blocked credits — where ITC is NOT allowed

Section 17(5) blocks ITC on certain purchases even if used for business. The common ones:

Motor vehicles for personal transport (with limited exceptions like cab operators, transporters, driving schools)
Food and beverages, outdoor catering, club and gym memberships
Goods or services used for personal consumption
Works-contract and construction of immovable property (for your own use)
Goods lost, stolen, destroyed, or given as free samples/gifts

5Why reconciliation matters

Because ITC depends on what's in your GSTR-2B, you must reconcile your purchase register against GSTR-2B every period before claiming. Claiming ITC that isn't in GSTR-2B, or on blocked items, leads to reversal with 18% interest under Section 50 and possible penalty.

✅ TipChase suppliers who haven't filed their GSTR-1 — their delay directly blocks your ITC. Many businesses hold a portion of payment until the supplier's invoice appears in GSTR-2B.

Key takeaways

ITC lets you offset GST paid on purchases against GST collected on sales, so you only pay on value added.
You can claim ITC only for invoices showing in your GSTR-2B (supplier filed and paid).
All five conditions of Section 16 must be met, including filing your own return.
Section 17(5) blocks ITC on cars, food, club memberships, personal-use and construction items.
Reconcile GSTR-2B every period — wrongly claimed ITC is reversed with 18% interest.

Frequently asked questions

Can I claim ITC if the supplier hasn't filed their return?

Generally no. ITC is restricted to invoices reflected in your GSTR-2B, which depends on the supplier filing GSTR-1 and paying tax. Reconcile before claiming, and follow up with suppliers, to avoid reversal with interest.

What is the time limit to claim ITC?

ITC for a financial year can be claimed up to 30 November of the following year, or the date of filing the annual return, whichever is earlier. Miss it and the credit lapses.

Can I claim ITC on a car bought for my business?

Usually no — Section 17(5) blocks ITC on motor vehicles for personal transport. Exceptions apply if the vehicle is used for further supply (resale), passenger transport (cabs/buses), goods transport, or driving training.

What is the difference between GSTR-2A and GSTR-2B?

Both show purchase invoices from suppliers, but GSTR-2B is a static, monthly statement that fixes your eligible ITC for that period, while GSTR-2A is dynamic and keeps updating. ITC eligibility is based on GSTR-2B.