What is Input Tax Credit (ITC) in GST?

By the India Law Simplified editorial team · Verified against the bare Acts & official portals · Updated 2026-08-18 · ~8 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.

6The deadline to claim: section 16(4)

Input tax credit is not available indefinitely. Under section 16(4) you must claim the credit on an invoice or debit note by the earlier of two dates: 30 November following the end of the financial year to which the invoice relates, or the date you actually furnish the annual return for that year.

Because most taxpayers file the annual return after November, 30 November is the operative deadline in practice. Credit not taken by then is lost — it does not carry forward and there is no mechanism to revive it.

⚠️ ImportantThis is the single largest avoidable ITC loss in Indian GST practice. An invoice from April of one year has a claim window that closes on 30 November of the next.

7Rule 37: pay your supplier within 180 days

Claiming the credit is not the end of the obligation. If you have not paid the supplier the invoice value together with the tax within 180 days of the invoice date, the credit already taken must be reversed, with interest.

The credit can be reclaimed once payment is actually made, and that re-claim is not subject to the section 16(4) time limit — but the reversal in the meantime is mandatory, not optional.

✅ TipBusinesses that stretch supplier payments past six months routinely miss this and discover it during an audit, by which point the interest has accumulated.

8The order in which credit must be used

Credit cannot be applied arbitrarily across tax heads. IGST credit must be exhausted first, and only then may CGST and SGST credit be used.

Within that, CGST credit cannot be set off against SGST liability, and SGST credit cannot be set off against CGST liability. The two remain separate throughout.

⚠️ ImportantGetting the order wrong does not usually change the total, but it produces a cash payment in one head while credit sits unused in another — a working-capital cost rather than a tax cost.

9GSTR-2B is the source of truth

Credit is no longer a matter of what your books say you paid. Since the provisional-credit rules were withdrawn, ITC is available only to the extent it appears in your auto-generated GSTR-2B for the period.

That makes your credit dependent on your supplier's compliance. If they do not file their GSTR-1, or file it late, or report your GSTIN incorrectly, the invoice does not reach your 2B and the credit is simply unavailable to you that month — regardless of a valid invoice sitting in your file.

✅ TipReconcile purchases against 2B monthly rather than annually. Chasing a supplier about an April invoice in the following November, with the section 16(4) deadline days away, rarely ends well.

Key takeaways

ITC is available only to the extent the invoice appears in your GSTR-2B.
The claim deadline is 30 November following the financial year, or the annual return date if earlier.
Pay your supplier within 180 days or the credit reverses with interest under Rule 37.
IGST credit must be used before CGST and SGST, which cannot be cross-utilised.
Blocked credits stay blocked however the expense is booked.

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.

What happens if I do not pay my supplier within 180 days?

Rule 37 requires you to reverse the credit already claimed, with interest. You may reclaim it once you actually pay, and that re-claim is not restricted by the section 16(4) deadline — but the reversal in the meantime is mandatory.

In what order must I use my credit?

IGST credit must be exhausted first, and only then CGST and SGST. CGST credit cannot be set off against SGST liability, and SGST cannot be set off against CGST. Getting the order wrong usually costs working capital rather than tax.

Is 30 November a hard deadline?

In practice yes. Section 16(4) allows credit until the earlier of 30 November following the financial year or the date you file that year's annual return. Since most file the annual return later, 30 November governs — and credit missed after it cannot be revived.

Can I claim ITC on goods lost, stolen or given away as samples?

No. Section 17(5) blocks credit on goods lost, stolen, destroyed, written off, or disposed of by way of gift or free sample. If credit was already taken it must be reversed. This catches businesses that run promotional giveaways and treat the input tax as recoverable.