Section 437 of the Income-tax Act, 2025 — Interest on Income Tax Refunds (Successor to Section 244A)

In plain language

What Section 437 says in plain English

When the Income Tax Department holds more of your money than it should — because you paid extra TDS, advance tax or self-assessment tax, or because an appeal reduces your demand — the department must not just return the money. It must also pay you interest for the time your money was stuck with them. Section 437 of the Income-tax Act, 2025 is the provision that guarantees this. It is the direct successor to the well-known Section 244A of the Income-tax Act, 1961, and it carries forward the same core idea with a cleaner, table-based structure.

• Rate of interest: Simple interest at 0.5% for every month or part of a month — that works out to roughly 6% per annum.
• Simple, not compound: Interest is calculated only on the refund principal, not on interest already accrued.
• Part of a month counts fully: Even one day into a new month is treated as a whole month for the 0.5% calculation.

Who it applies to

Section 437 applies to every assessee to whom a refund becomes due under the Act — salaried individuals, business owners, professionals, companies, firms and even deductors in certain cases. You do not need to separately claim the interest; the department is required to compute and pay it along with the refund.

From which date does interest run?

This is the most important practical part, because the start date decides how much interest you get. Section 437 fixes the start date based on where the refund came from:

• Refund out of TDS, TCS or advance tax: If you filed your return on or before the due date, interest runs from 1st April of the assessment/relevant period (i.e., the year following the tax year) up to the date the refund is granted. If you filed your return late, interest runs only from the date of filing — so late filing costs you interest.
• Refund of self-assessment tax / tax paid under Section 266: Interest runs from the later of the date of filing the return or the date of paying that tax, up to the date of refund.
• Any other case (e.g., excess tax paid against a demand): Interest runs from the date the tax was paid against the notice of demand, up to the refund date.

The 10% threshold — a key limit

Section 437 keeps a filter from the old law: no interest is payable in the TDS/TCS/advance-tax and self-assessment categories if the refund amount is less than 10% of the tax determined under Section 270(1) (regular assessment). This stops tiny refunds from generating interest claims and reduces administrative friction.

Delay caused by you is excluded

If the refund proceedings are delayed for reasons attributable to you (or the deductor) — for example, you did not respond to a notice, or submitted incorrect bank details — that period of delay is excluded from the interest calculation. Where there is a dispute about whose fault the delay was, the matter is decided by the Principal Commissioner/Commissioner, whose decision on the period of exclusion is final.

Extra interest for delayed appeal-effect refunds

A powerful feature carried into Section 437 is additional interest. Where a refund arises from an appeal or other order and the department fails to grant it within the time allowed, the assessee is entitled to further interest at 3% per annum for the period beginning after the expiry of the statutory time limit until the refund is finally granted. This is a penalty on the department for sitting on your money.

How it interacts with other sections

• It works alongside the refund machinery in Sections 431–438 — Section 437 is only the interest piece.
• If interest is later found to have been excess-granted (for example, the refund is reduced in a later order), the excess interest can be recovered via a notice of demand.
• The interest you receive is generally taxable as "Income from Other Sources" in the year of receipt — the refund principal itself is not taxable, but the interest component is.

Practical implications

File your return on or before the due date to preserve interest from 1st April; give correct, pre-validated bank details to avoid "attributable delay"; and check the intimation to confirm the department has actually paid the interest it owes. Remember to declare the interest in your next return so you are not caught in a mismatch.