Input Tax Credit Under Section 16: Conditions, Time Limits, and the 30 November Deadline

Input Tax Credit is the mechanism that stops GST from becoming a tax on a tax, but the right to it is conditional and time-barred. Section 16 of the CGST Act is where both the conditions and the deadline live, and in 2026 the GST portal enforces the deadline directly rather than leaving it to be litigated later. Every practitioner needs the section committed to memory, because a client who misses its outer limit does not get the credit back.

The section works in two layers. First, four conditions that must all be satisfied before a credit can be taken. Second, a cut-off date beyond which the credit cannot be taken at all, regardless of whether the conditions are met.

The four conditions under Section 16(2)

1. Possession of a tax invoice or debit note. The recipient must hold a valid document issued by a registered supplier for the inward supply.
2. The invoice appears in the recipient's auto-generated statement. Section 16(2)(aa), effective 1 January 2022, requires the invoice to be reflected in GSTR-2B and not restricted there. This is the condition that the Invoice Management System now sits on top of.
3. Receipt of the goods or services. Credit cannot be taken before the supply is actually received; where goods are delivered in lots, credit is available only on receipt of the last lot.
4. Tax actually paid to the government and a valid return filed. The supplier's tax must have reached the exchequer, and the recipient must have furnished the GSTR-3B for the period in which the credit is claimed.

These are cumulative. A perfectly genuine purchase with a valid invoice still yields no credit if the invoice never shows up in GSTR-2B — which is exactly why GSTR-2B reconciliation has become the centre of gravity in monthly compliance.

The 180-day payment rule

Section 16 also requires the recipient to pay the supplier the invoice value plus tax within 180 days of the invoice date. Fail to, and the credit already taken must be reversed, with interest, and can only be reclaimed once payment is finally made. For businesses with long payables cycles this is a live monthly reversal exercise, not a theoretical rule, and it needs to be tracked against the accounts-payable ageing rather than reconstructed at year-end.

The time limit under Section 16(4)

This is the provision that ends the argument. ITC in respect of an invoice or debit note for a financial year cannot be taken after the earlier of: 30 November following the end of that financial year, or the date of filing the annual return for that year.

In 2026 this is not a self-policing rule. With Table 4A ITC in GSTR-3B tied to GSTR-2B from the July 2026 tax period, and filing blocked where the claimed credit exceeds the auto-populated 2B balance, a late claim that has no matching 2B entry simply cannot be entered. The discipline the section always demanded is now enforced at the portal.

Credits that Section 16 will never allow: Section 17(5)

Separately from timing, Section 17(5) blocks certain credits outright no matter how cleanly the Section 16 conditions are met. The recurring ones for most businesses:

• Motor vehicles for passenger transport with seating capacity up to 13 persons, and related insurance, repairs and maintenance — unless the business is in the trade of vehicles, transport, or driving instruction.
• Food and beverages, outdoor catering, health services, and club or fitness memberships, unless used to make an outward taxable supply of the same category or required by law for the employer to provide.
• Works contract services and goods or services used for construction of immovable property on own account, other than plant and machinery.
• Goods lost, stolen, destroyed, written off, or disposed of by gift or free sample.
• Tax paid under a composition scheme, and tax paid on account of fraud, wilful misstatement or confiscation.

A reconciliation that only matches invoice numbers will happily pass a blocked credit straight into the claim. GSTR-2B's ITC Not Available section flags some of these, but the 17(5) call on a matched, available invoice is a judgment the practitioner has to make on the nature of the expense.

A pre-deadline checklist for FY 2025-26

1. Reconcile every month of FY 2025-26 against its GSTR-2B and list invoices that are in 2B but never claimed in GSTR-3B.
2. Clear the IMS backlog — anything left pending for FY 2025-26 supplies must be accepted and claimed before 30 November 2026 or written off.
3. Check the 180-day register for credits reversed during the year that have since been paid and are now re-claimable.
4. Run every material claimed invoice past Section 17(5) and reverse anything blocked, with interest, before it hardens into the annual return.
5. Only then file the FY 2025-26 annual return — filing it earlier than 30 November closes the Section 16(4) window early.