CGST Act 2017 Section 16: Input Tax Credit Eligibility (2026)

Explainer · GST · Input Tax Credit

Updated for 2026 · Claw Editorial

Section 16 of the Central Goods and Services Tax Act, 2017 is the heart of input tax credit, the mechanism that lets a business set off the GST it pays on purchases against the GST it collects on sales. Section 16 answers two questions. Who can claim the credit, and on what conditions? It is also one of the most litigated provisions in GST, because the tax department often disallows credit for a missed condition or a late claim. This explainer sets out the eligibility, the four core conditions, the 180-day rule, the time limit, and the important 2024 amendments that gave relief for older years. Last verified October 2026.

01What input tax credit is

Input tax credit, or ITC, is the credit a registered business gets for the GST it has already paid on its purchases of goods and services. It uses that credit to reduce the GST it must pay on its own sales. This is what stops tax from piling up at every stage and keeps GST a tax on value added.

Section 16(1) says every registered person is entitled to take credit of the input tax charged on supplies that are used or intended to be used in the course or furtherance of business. But the entitlement comes with conditions, and those conditions are where most disputes arise.

02The four conditions in Section 16(2)

Section 16(2) is the gatekeeper. No registered person can take ITC unless all of these are satisfied:

• Tax invoice or debit note: the buyer has a valid tax invoice or debit note from a registered supplier.
• Credit reflected in GSTR-2B: the details of the invoice have been furnished by the supplier and appear in the buyer's auto-drafted statement, under Section 16(2)(aa).
• Receipt of goods or services: the buyer has actually received the goods or the services.
• Tax actually paid and return filed: the tax charged has actually been paid to the government, and the buyer has filed the relevant return.

The condition that the tax must actually reach the government, and that the credit must show in GSTR-2B, is the reason so much ITC is blocked when a supplier defaults or files late.

03The 180-day payment rule

There is a further condition in the second proviso to Section 16(2). If the buyer does not pay the supplier the value of the supply, together with the tax, within 180 days from the date of the invoice, the credit already taken has to be added back to the buyer's output tax, with interest.

The credit can be taken again once the payment is actually made. The rule is meant to stop a buyer from claiming credit on invoices it never intends to pay.

04The time limit under Section 16(4)

Section 16(4) sets the deadline. A registered person cannot take ITC on an invoice or debit note after the thirtieth day of November following the end of the financial year to which it relates, or the date of filing the annual return, whichever is earlier.

This hard deadline has caused many disputes, because businesses that filed late returns found their genuine credit disallowed only for being out of time. That is the background to the 2024 relief described below.

05The 2024 relief: Sections 16(5) and 16(6)

The Finance (No. 2) Act, 2024 inserted two new sub-sections, 16(5) and 16(6), with retrospective effect from 1 July 2017, to soften the time limit in Section 16(4):

• Section 16(5): for the financial years 2017-18, 2018-19, 2019-20 and 2020-21, ITC can be claimed through a return filed up to 30 November 2021. So credit is not lost under Section 16(4) for those early years if the return was filed by that date.
• Section 16(6): where a registration was cancelled and later restored on revocation, it allows the taxpayer to claim ITC for the period between cancellation and restoration, within the conditions set out.

The Central Board of Indirect Taxes and Customs issued Circular No. 237/31/2024-GST dated 15 October 2024 explaining how these provisions apply, including to cases where an order was already passed disallowing credit under Section 16(4). Many such orders are now being reopened or rectified in the taxpayer's favour.

06Litigation and a practical note

Section 16 generates heavy litigation. The common disputes are ITC blocked because it did not appear in GSTR-2B, credit denied on the ground that the supplier did not pay the tax, and credit disallowed as time barred under Section 16(4). High Courts have been divided on how far a genuine buyer can be punished for a supplier's default, and several of the time-bar matters are being resolved in the taxpayer's favour after the 2024 amendments.

For a business, the practical steps are to reconcile purchases with GSTR-2B every month, pay suppliers within 180 days, and claim credit within time. If a demand is raised, it usually comes through a notice such as the ASMT-10 scrutiny notice or the DRC-01 show cause notice, which can be challenged before the appellate authority. To keep notices and hearings organised, many teams use GST litigation and notice tracking.

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.

ITC disputes turn on how the High Courts, the GST appellate authorities and the tribunals have read the conditions in Section 16, the 180-day rule and the time limit. Claw lets you search more than 30 crore judgments and orders on Section 16 and input tax credit, with results in under 5 seconds, and lets you follow a live tax matter by party name across 9,102 courts, benches and forums, including the High Courts and tax tribunals explained in the coverage of tax tribunals. Reported authority runs from Supreme Court rulings of 1950 and High Court rulings of 1990 to the latest orders. Claw does not use the documents you upload to train its AI models.

Create a FREE Claw account to see how Section 16 has been applied and to track a pending GST matter, and use case search across Indian courts to find orders in similar cases.

08Sources and further reading

• India Code (CGST Act, 2017 bare text): indiacode.nic.in
• CBIC (GST law, circulars and notifications): cbic.gov.in
• Claw: clawlaw.in

This explainer is general information, not legal or tax advice. GST law changes often through amendments, circulars and rulings, so check the current position and take advice from a tax professional before you act.

09Frequently asked questions