Explainer · Tax · GST
Input Tax Credit Disputes (2026)
Input tax credit is the mechanism that stops GST from becoming a tax on tax, by letting a business set off the tax it paid on purchases against the tax it collects on sales. It is also the single most disputed thing in GST. Credit is denied for mismatches, for a supplier who did not pay, for blocked categories and for late claims, and each denial can turn into a demand with interest and penalty. Knowing the conditions and the flashpoints is how a business protects its credit. This explainer, for businesses, finance teams and their advisers, sets out when ITC can be claimed, why it gets disputed, and how a disallowance becomes a demand you can contest. It is general information, not legal advice. Last verified October 2026.
- What ITC is: the right to set off GST paid on purchases against GST on sales, under Section 16 of the CGST Act, 2017.
- Conditions: valid invoice, receipt of the supply, appearance in GSTR-2B, tax actually paid to the government, return filed, within the Section 16(4) time limit.
- Blocked credits: Section 17 apportions mixed use and Section 17(5) lists credits that are not allowed at all.
- Common disputes: mismatch with GSTR-2B, supplier default, blocked credits, time barred claims, and alleged fake invoices.
- How it is pursued: a disallowance becomes a demand under Section 73 or 74, with appeal under Section 107 and then to the GST Appellate Tribunal.
01The short answer
Input tax credit (ITC) is the right to set off GST paid on your purchases against GST on your sales. The conditions are in Section 16 of the CGST Act, 2017: you must hold a tax invoice, have received the goods or services, the tax must actually have been paid to the government, and you must have filed your return. The invoice must also appear in your GSTR-2B, and the claim must be made within the time limit in Section 16(4).
Disputes arise when the department says one of these conditions is not met: a mismatch with GSTR-2B, a supplier who did not pay, a blocked credit under Section 17(5), or a late claim. A disallowance is then pursued through a demand under Section 73 or 74, which you can contest and appeal.
02The conditions for claiming ITC
Section 16 sets the gate. To claim ITC you generally need all of these:
| Condition | What it means |
|---|---|
| Tax invoice or debit note | You hold a valid document for the supply. |
| Receipt of goods or services | You have actually received the supply. |
| Appears in GSTR-2B | The supplier reported the invoice, so it shows in your auto statement (Section 16(2)(aa)). |
| Tax paid to the government | The tax charged has actually reached the government. |
| Return filed | You have furnished the relevant return. |
| Within the time limit | Claimed by the cut off under Section 16(4). |
Miss any one and the credit is at risk. The matching requirement and the time limit are the two conditions that catch out the most businesses, because they depend partly on the supplier and on the calendar, not just on you.
03Blocked and restricted credits
Even when the Section 16 conditions are met, some credits are simply blocked. Section 17 deals with apportionment where inputs are used partly for business and partly otherwise, or partly for taxable and partly for exempt supplies, and Section 17(5) lists credits that are not allowed at all.
Common blocked items under Section 17(5) include certain motor vehicles, some works contract and construction for immovable property, and goods or services for personal consumption, among others. A business that claims a blocked credit, even honestly, will face a disallowance, so it pays to test every large claim against the Section 17(5) list before taking it.
04Where disputes usually arise
Most ITC disputes cluster around a few recurring issues:
- Mismatch between the credit you claimed in GSTR-3B and what appears in GSTR-2B.
- Supplier default, where your supplier did not file or did not pay the tax.
- Blocked credits claimed contrary to Section 17(5).
- Time barred claims taken after the Section 16(4) cut off.
- Fake or non genuine invoices, where the department alleges there was no real supply.
Each of these is a condition in Section 16 or 17 being tested. The best defence is documentary: invoices, proof of receipt, proof of payment to the supplier, and your reconciliations.
05The supplier default problem
The hardest dispute for an honest buyer is when the supplier did not pay the tax. The law ties your credit to the tax actually reaching the government, so a buyer can be denied credit for a default that was not its fault. This is one of the most litigated questions in GST.
The buyer did everything right but the supplier did not pay. Whether the buyer still keeps the credit is one of the most contested questions in GST.
Courts have looked at whether a genuine buyer, who paid the supplier including the tax and holds valid invoices, should lose credit for the supplier default, and the position continues to develop. The practical lesson is to keep strong proof that the supply was real and that you paid the supplier, and to watch supplier compliance, because your credit partly depends on it.
06How a disallowance becomes a demand
A disallowed credit does not just disappear from your ledger. The department raises it through a show cause notice and demand, under Section 73 where there is no fraud, or Section 74 where fraud, wilful misstatement or suppression is alleged, with a newer Section 74A providing a common framework for periods from financial year 2024-25 onward. The demand carries interest and, under Section 74, heavier penalty.
You can reply to the notice, and if the order goes against you, appeal to the Appellate Authority under Section 107, and onward to the GST Appellate Tribunal. For handling the demand itself, see how to handle a GST demand order, and for the tribunal stage, see the GST Appellate Tribunal explained.
07Where Claw fits
Claw is an all-in-one legaltech platform for Indian advocates, law firms, and corporate legal teams, combining AI-based case search, an AI legal assistant (Legal GPT), case management, and compliance automation across all Indian courts and tribunals.
Claiming and defending ITC is for you and your advisers, which Claw does not do. Where Claw helps is in finding the precedents and tracking the matters that shape these disputes. Claw tracks GST Appellate Tribunal, Income Tax Appellate Tribunal and High Court tax matters, along with their appeals, across 9,102 courts, benches and forums, with alerts and monitoring, so a taxpayer or counsel can follow how a dispute and similar matters move. Its Legal GPT researches across 30 crore+ judgments, with Supreme Court decisions from 1950 and High Court decisions from 1990, so you can see how courts have treated supplier default, mismatch, blocked credits and time limits before. Results return in under 5 seconds, and Claw does not train its AI models on your documents. To follow a tax matter or an opponent, run a case search across Indian courts by name. A clean result means nothing was found on the forums and date searched, and this is general information, not legal advice.
Related reading: how to handle a GST demand order and the GST Appellate Tribunal explained.
08Sources and further reading
- India Code (CGST Act, 2017, Sections 16, 17, 73, 74): indiacode.nic.in
- CBIC GST (Central Board of Indirect Taxes and Customs): cbic-gst.gov.in
- GST portal: gst.gov.in
- Claw: clawlaw.in
This explainer is general information, not legal advice. ITC rules and case law change; confirm the current position and your own facts before acting.
09Frequently asked questions
What are the conditions to claim input tax credit?
Under Section 16 of the CGST Act, 2017 you generally need a valid tax invoice or debit note, actual receipt of the goods or services, the invoice appearing in your GSTR-2B, the tax having actually been paid to the government, and your return filed, all within the time limit in Section 16(4). Missing any one condition puts the credit at risk of disallowance.
Why is input tax credit disputed so often?
Because the conditions depend partly on others and on the calendar. Credit is denied for a mismatch between GSTR-3B and GSTR-2B, for a supplier who did not file or pay the tax, for blocked credits under Section 17(5), for claims made after the Section 16(4) cut off, and where the department alleges fake invoices. Each is a statutory condition being tested, which is why documentary proof matters.
Can I lose ITC because my supplier did not pay the tax?
It is possible, because the law ties your credit to the tax actually reaching the government, and this is one of the most litigated questions in GST. Courts have examined whether a genuine buyer who paid the supplier and holds valid invoices should lose credit for a supplier default, and the position keeps developing. Keep strong proof the supply was real and that you paid the supplier, and watch supplier compliance.
What are blocked credits under GST?
Credits that are not allowed even when the Section 16 conditions are met, listed in Section 17(5), such as certain motor vehicles, some works contract and construction for immovable property, and goods or services for personal consumption, among others. Section 17 also apportions credit where inputs are used partly for business or taxable supplies and partly not. Test large claims against Section 17(5) before taking them.
What happens if my ITC is disallowed?
The department raises it as a demand through a show cause notice, under Section 73 where there is no fraud or Section 74 where fraud, wilful misstatement or suppression is alleged, with a newer Section 74A framework for periods from FY 2024-25. The demand carries interest and penalty. You can reply to the notice and, if the order goes against you, appeal to the Appellate Authority under Section 107 and then to the GST Appellate Tribunal.