Every quarter, thousands of GST-registered businesses in India quietly leave money on the table. A manufacturer in Pune pays ₹2,40,000 in GST on raw materials but forgets to reconcile the figures against the supplier’s filings, so a chunk of that credit silently lapses. Across town, a trader confidently claims input tax credit on a director’s car and a staff Diwali lunch, only to face a reversal, interest, and a penalty notice eighteen months later. Both businesses got input tax credit under GST wrong, and both paid for it from working capital they could not spare.

Input tax credit is the single most powerful mechanism the GST regime offers to keep your tax burden fair. Used correctly, it ensures you pay tax only on the value you add. Used carelessly, it becomes a recurring source of cash leakage and compliance risk. This guide walks you through what ITC is, the exact conditions you must satisfy in 2026, the credits the law blocks outright, and the reversal rules that catch most businesses off guard.

What Is Input Tax Credit Under GST?

Input tax credit is the credit you receive for the GST you have already paid on purchases used to run your business. When you buy goods or services from a registered supplier, you pay GST on that purchase. When you later sell your own goods or services, you collect GST from your customers. ITC lets you set off the tax you paid on inputs against the tax you owe on outputs, so you remit only the difference to the government.

Consider a simple example. You buy stock worth ₹1,00,000 and pay ₹18,000 in GST. You sell finished goods for ₹1,50,000 and collect ₹27,000 in GST from your customer. Instead of paying the full ₹27,000 to the government, you claim the ₹18,000 already paid as input tax credit and remit only ₹9,000. This is the core promise of GST: tax flows through the supply chain and falls only on the final consumer, not on every business in between.

The catch is that this credit is conditional. The law does not hand it out automatically. You earn it only when a specific set of requirements is met, and you can lose it just as easily if you miss a deadline or claim something the law has blocked.

The Four Core Conditions for ITC Eligibility 2026

Section 16 of the CGST Act sets out the conditions every registered person must satisfy before claiming credit. For ITC eligibility 2026, all four conditions below must be met together. Missing even one disqualifies the claim for that invoice.

1. You Possess a Valid Tax Invoice

You must hold a valid tax invoice, debit note, or another prescribed document issued by a registered supplier. The document must carry all the mandatory particulars: the supplier’s GSTIN, your GSTIN, the invoice number and date, a clear description of the goods or services, the taxable value, and the GST charged. A handwritten estimate, a quotation, or a proforma invoice does not qualify.

2. You Have Received the Goods or Services

Credit is available only once you have actually received the goods or services. If goods are delivered in instalments against a single invoice, you can claim the full credit only when the last instalment is received. The law also recognises the “bill to ship to” model, where goods delivered to a third party on your instruction are treated as received by you.

3. The Supplier Has Paid the Tax and the Invoice Appears in Your GSTR-2B

This is the condition that trips up the most businesses. Your supplier must have reported the invoice in their GSTR-1 and paid the tax to the government. Only then does the invoice flow into your auto-generated GSTR-2B statement. If your supplier has not filed or has filed incorrectly, the credit will not appear, and you cannot claim it, no matter how genuine your purchase is.

4. You Have Filed Your GST Return

Finally, you must file your GSTR-3B return for the relevant period to actually avail the credit. The credit is claimed by reporting it in your return; it does not accrue to your electronic credit ledger by itself. If you have not filed, the credit simply sits unclaimed.

The GSTR-2B Matching Requirement

GSTR-2B is a static, auto-drafted input tax credit statement generated for every registered taxpayer each month. It pulls together the invoices your suppliers have reported and tells you, line by line, how much credit you are eligible to claim. Because the credit available in your return is effectively capped by what appears in GSTR-2B, reconciliation has become non-negotiable.

Before filing each GSTR-3B, you should match your purchase register against GSTR-2B. Where an invoice in your books does not appear in GSTR-2B, the credit is not yet available, and you will need to follow up with the supplier. Treating GSTR-2B as the single source of truth for eligible credit protects you from claiming amounts the system will later flag.

• Invoice in your books but missing from GSTR-2B: chase the supplier to file or amend their GSTR-1.
• Invoice in GSTR-2B but not in your books: check whether you have missed recording a genuine purchase.
• Value or GSTIN mismatch: get the supplier to correct their filing before you claim.

How to Claim Input Tax Credit: Step by Step

Knowing how to claim input tax credit correctly is a matter of process discipline, not luck. Follow this sequence every tax period and the credit takes care of itself.

1. Maintain a clean purchase register recording every tax invoice with supplier GSTIN, invoice number, taxable value, and tax amount.
2. Download your GSTR-2B from the GST portal once it is generated for the period.
3. Reconcile your purchase register against GSTR-2B and resolve every mismatch.
4. Exclude any blocked credits under Section 17(5) and reverse credit on inputs used for exempt supplies or personal purposes.
5. Report the eligible ITC in the relevant table of your GSTR-3B and file the return.
6. Confirm the credit has landed in your electronic credit ledger before using it to offset output tax.

Time Limit to Claim ITC

ITC is not available indefinitely. For invoices relating to a given financial year, you must claim the credit by the earlier of two dates: the 30th of November following the end of that financial year, or the date of filing the annual return for that year. Whichever falls earlier is your hard cutoff.

In practice this means credit on a purchase invoice dated in the 2025-26 financial year must be claimed by 30 November 2026 (assuming the annual return is filed after that date). Miss the window and the credit lapses permanently. This single deadline is why year-end reconciliation, rather than a once-a-year scramble, should be a routine part of your monthly close.

Blocked Credit Under Section 17(5)

Even when all four eligibility conditions are met, the law specifically blocks credit on certain categories of expense. These are the blocked credit Section 17(5) items, and claiming them is one of the fastest ways to attract a reversal with interest. Knowing this list cold saves you from expensive mistakes.

• Motor vehicles for transport of persons with seating capacity of up to 13 (including the driver), except when used for further supply of vehicles, passenger transport, or driving training.
• Food and beverages, outdoor catering, beauty treatment, health services, and club or fitness membership, unless used to make an outward taxable supply of the same category.
• Membership of a club, health, or fitness centre.
• Rent-a-cab, life insurance, and health insurance, except where the employer is legally obligated to provide it.
• Travel benefits extended to employees on vacation, such as leave or home travel concession.
• Works contract services for construction of immovable property, except where it is an input service for further works contract supply.
• Goods or services used for construction of immovable property on your own account, other than plant and machinery.
• Goods or services used for personal consumption.
• Goods lost, stolen, destroyed, written off, or given away as gifts or free samples.

Eligible vs Blocked Credits at a Glance

The table below maps common business expenses to whether ITC is generally available, so your accounts team can apply a quick first filter before booking credit.

Expense	ITC Position	Why
Raw materials and stock-in-trade	Eligible	Directly used to make taxable outward supplies
Office rent (with GST invoice)	Eligible	Input service used in the course of business
Goods transport and logistics	Eligible	Input service for business supplies
Plant and machinery	Eligible	Specifically excluded from the construction block
Staff lunches and outdoor catering	Blocked	Food and beverages under Section 17(5)
Car for director’s personal use	Blocked	Passenger motor vehicle and personal use
Office building construction	Blocked	Immovable property on own account
Diwali gifts to clients	Blocked	Goods disposed of as gifts

ITC Reversal Rules You Cannot Ignore

Claiming credit is only half the picture. The law also requires you to reverse credit in specific situations, and failure to do so attracts interest. Three reversal scenarios catch most SMEs.

Non-Payment Within 180 Days

If you claim ITC on an invoice but do not pay your supplier the invoice value along with the tax within 180 days of the invoice date, you must reverse that credit along with interest. You can reclaim it later once you make the payment. This rule is designed to stop businesses from taking credit on bills they never intend to settle.

Common Credit for Exempt Supplies (Rule 42 and Rule 43)

If you make both taxable and exempt supplies, you cannot claim the full credit on inputs and input services that are used for both. Rule 42 governs the proportionate reversal of common credit on inputs and input services, while Rule 43 deals with the reversal on capital goods. The credit attributable to exempt supplies and to non-business use must be calculated and reversed each period, with an annual true-up.

Other Reversal Triggers

Credit must also be reversed where inputs are used for personal purposes, where goods are lost or written off, or when you switch to the composition scheme or your registration is cancelled. Building these checks into your monthly close prevents an unpleasant surprise during an audit or annual return reconciliation.

Common ITC Mistakes That Cost SMEs Money

• Claiming credit straight from the purchase register without reconciling against GSTR-2B, then having to reverse the excess with interest.
• Booking ITC on blocked items such as staff meals, club memberships, or passenger vehicles out of habit.
• Letting the 30 November deadline pass on prior-year invoices, permanently forfeiting genuine credit.
• Ignoring the 180-day payment rule and forgetting to reverse credit on unpaid supplier bills.
• Failing to run the Rule 42 and Rule 43 reversal when the business has any exempt or non-business supplies.
• Dealing with suppliers who have poor filing compliance, which quietly blocks your legitimate credit month after month.

That last point is worth dwelling on. The single most effective way to protect your input tax credit is to work with suppliers who file on time and accurately. Before onboarding a new vendor, it pays to verify their corporate standing and compliance track record. You can check a company’s registration and director details for free against 27+ lakh MCA companies using WeeDoo’s company search, and retrieve filed documents at ₹249 per company when you need deeper due diligence.

For working out the GST and net tax payable on a transaction, WeeDoo also offers a suite of free financial calculators, and if you are still getting your registration in order, WeeDoo’s GST services can handle GSTIN registration and ongoing compliance so your credit chain stays clean from day one.

Frequently Asked Questions

Can I claim ITC if my supplier has not filed their GST return?

No. If your supplier has not reported the invoice in their GSTR-1 and paid the tax, it will not appear in your GSTR-2B, and the credit is not available to you. This is why supplier compliance directly affects your cash flow. Your remedy is to follow up with the supplier to file or amend their return, after which the credit flows through and you can claim it in a later period, subject to the overall time limit.

What is the last date to claim ITC for a financial year?

You must claim ITC for invoices of a financial year by the earlier of 30 November of the following financial year or the date you file the annual return for that year. For most businesses the 30 November date is the binding deadline. After this cutoff, unclaimed credit lapses permanently, so reconcile prior-year invoices well before the window closes.

Is ITC available on a car purchased for my business?

Generally no. Credit on motor vehicles for the transport of persons with a seating capacity of up to 13 is blocked under Section 17(5). The exceptions are narrow: vehicles bought for further supply (a car dealer), for passenger transport services (a taxi operator), or for driving instruction. A car used for general business travel or a director’s commute does not qualify.

Do I need to reverse ITC if I have not paid my supplier?

Yes. If you have claimed credit but not paid the supplier the invoice value plus tax within 180 days of the invoice date, you must reverse the credit along with interest. The good news is that the reversal is not permanent: once you make the payment, you can reclaim the credit, even if that happens after the normal time limit for that invoice.

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

Both reflect the invoices your suppliers report, but GSTR-2A is dynamic and keeps updating as suppliers file, while GSTR-2B is a static statement generated once each month. Because GSTR-2B is fixed for the period, it is the reliable reference point for determining your eligible ITC when filing GSTR-3B. Use GSTR-2B as your basis for claiming credit and GSTR-2A for tracking ongoing supplier activity.