Section 16(4), 16(5) and 16(6) of the CGST Act: A Period-Wise ITC Time-Limit Guide

The ordinary rule in section 16(4)

Section 16(4) is an outer time limit on taking input tax credit for an invoice or debit note. The current statutory formulation uses the earlier of:

1. 30 November following the end of the financial year to which the invoice or debit note pertains; or
2. the date on which the relevant annual return is furnished.

This deadline does not by itself establish eligibility. The other conditions in section 16—such as possession of the prescribed document, receipt of goods or services, communication of invoice details where applicable, payment of tax to the Government and furnishing the return—must still be tested on the facts.

The financial year of the invoice is therefore the first research input. The return date is the second. Without both, a time-limit conclusion is incomplete.

The period-wise position

Always verify the version of the law that governed the particular return and any year-specific extension or judicial order. The table is a research map, not a substitute for checking the operative text.

What section 16(5) changed

Section 118 of the Finance (No. 2) Act, 2024 inserted sub-sections (5) and (6) into section 16 retrospectively from 1 July 2017. Section 16(5) begins with a non-obstante clause overriding sub-section (4) for a narrow group of old invoices and debit notes.

It covers these four financial years:

• FY 2017–18;
• FY 2018–19;
• FY 2019–20; and
• FY 2020–21.

For those years, a registered person is entitled to take ITC in a return under section 39 filed up to 30 November 2021. The provision is not an open-ended reopening of old credit. The date and the covered years are part of the statutory test.

Worked example

Assume an invoice pertains to FY 2019–20 and the recipient took the otherwise eligible credit in a GSTR-3B filed on 20 November 2021. A conclusion based only on the ordinary section 16(4) deadline would be incomplete. Section 16(5) must be tested because FY 2019–20 is one of the named years and the return was filed before the special cut-off.

If the same credit was first taken in a return filed after 30 November 2021, section 16(5) does not protect it merely because the invoice belongs to one of the four years.

What section 16(6) does after revocation

Section 16(6) addresses a different problem. It applies where a registration was cancelled under section 29 and the cancellation was later revoked under section 30 or pursuant to an order of an appellate authority, tribunal or court.

The provision also requires that availment of ITC for the invoice or debit note was not restricted by section 16(4) on the date of the cancellation order. If that condition is satisfied, the credit can be taken in a section 39 return within the later of the alternatives set out in clauses (i) and (ii), including returns for the cancellation-to-revocation period filed within 30 days of the revocation order.

The dates that matter are therefore:

1. the effective date and order date of cancellation;
2. the date of the revocation order;
3. the financial year of each invoice or debit note; and
4. the dates on which the pending returns were filed.

CBIC’s procedural clarification

Circular No. 237/31/2024-GST explains how field formations should deal with section 16(5) and 16(6) at different procedural stages.

That last route was time-bound. The notification was issued on 8 October 2024 and the circular described a six-month application period. Anyone dealing with the matter now should not assume that the historical special window remains open; the present procedural remedy must be separately analysed.

The no-refund restriction

Section 150 of the Finance (No. 2) Act, 2024 is easy to miss. It provides that no refund shall be made of tax already paid or ITC already reversed which would not have been paid or reversed if section 118 had been in force at all material times.

This creates an important distinction:

• the amendment can affect a live demand, pending adjudication, appeal, revision or covered rectification case; but
• it does not automatically create a cash or credit refund for every historical reversal or payment.

A research note should state this restriction next to the relief. Presenting section 16(5) without section 150 can create a materially misleading impression.

A verification checklist

Before finalising a position, record the following in a working table:

1. GSTIN and registration status;
2. invoice or debit-note number, date and financial year;
3. return period in which ITC was first taken;
4. actual filing date of that section 39 return;
5. annual-return filing date, where relevant;
6. whether cancellation and revocation are involved;
7. whether a DRC-01A, notice, order, appeal or revision exists;
8. every independent ground of proposed ineligibility; and
9. the exact statutory and circular pages relied upon.

Sections 16(5) and 16(6) address the time-limit issue. They do not erase a separate objection about receipt, document validity, blocked credit, supplier compliance or business use.

The safest way to state the conclusion

Use a period-specific conclusion: identify the invoice year, state the filing date, apply the correct sub-section, and then list every condition that still needs factual proof. That is more defensible than saying only that “the ITC is allowed” or “time-barred.”