Income Tax Law · Updated 27 October 2026

Section 234A: Interest for Delay in Filing Income Tax Return

Section 234A of the Income-tax Act, 1961 provides for simple interest when a return of income is filed after the applicable due date or is not furnished. For tax years governed by the Income-tax Act, 2025, the corresponding provision is Section 423.

Key rule: Interest is generally charged at 1% for every month or part of a month on the relevant outstanding tax amount. A fraction of a month counts as a full month for this purpose. The law and due date applicable to the relevant assessment or tax year must be checked.

Meaning and scope of Section 234A

The provision applies to delay in furnishing a return required under Section 139(1), Section 139(4), Section 139(8A), or in response to a notice under Section 142(1), as applicable. Interest ordinarily begins on the day immediately after the statutory due date and runs until the date the return is furnished. Where no return is furnished, the statutory end point may be the date of completion of a best-judgment assessment under Section 144.

Due date: The date prescribed under Section 139(1), taking account of the taxpayer category and any valid extension. Simple interest: Interest computed on the prescribed tax base without compounding. Tax payable: The relevant assessed or returned tax after the credits and adjustments permitted by law.

Interest rate and calculation

As a general illustration, interest can be expressed as:

Section 234A interest = applicable outstanding tax × 1% × number of months or parts of months of delay.

For example, assume the filing due date is 31 July, the return is filed on 10 October, and the relevant outstanding tax base is Rs. 20,000. The delay spans August, September and part of October, counted as three months. Illustrative interest is Rs. 20,000 × 1% × 3 = Rs. 600. This illustration assumes no special adjustment, extension or change in the interest base.

What is the tax amount on which interest is charged?

The amount is not necessarily the gross tax shown on the return. Under the applicable statutory computation, reductions can include advance tax, tax deducted or collected at source, eligible foreign tax relief and available MAT or AMT tax credit. For self-assessment and updated returns, the detailed computation provisions of Sections 140A and 140B of the 1961 Act are relevant. Amounts of additional income-tax payable for an updated return are treated separately where the statute so provides.

Common situations

Situation	General treatment
Return filed after the due date	Interest generally runs from the day after the due date until filing, on the applicable tax base.
No return furnished	Interest may run until completion of the assessment specified in the provision.
Updated return	Interest is calculated under Section 234A read with Section 140B, taking account of the updated-return rules.
Delayed return in response to reassessment notice	Section 234A(3) may apply to the excess tax determined on reassessment for the relevant notice period.
Appeal or rectification changes assessed tax	Interest may require corresponding recomputation, and excess interest may become refundable.

Reassessment and changes to interest

Section 234A(3) addresses certain late or missing returns following notices under reassessment provisions. The interest period generally starts immediately after expiry of the time permitted by the notice, and the tax base is the statutory difference between the reassessed and previously determined tax. Under Section 234A(4), orders for rectification, appeal or revision that change the relevant tax can result in increased or reduced interest. A demand may be issued for an increase, while excess interest paid may be refunded where applicable.

Section 234A, Section 234B, Section 234C and Section 234F

Section 234A: Interest for delay in furnishing an income-tax return.
Section 234B: Interest for default in payment of advance tax.
Section 234C: Interest for deferment of advance-tax instalments.
Section 234F: Fee for default in furnishing a return, where applicable; it is separate from interest under Section 234A.

Income-tax Act, 2025: Section 423

The Income-tax Act, 2025 reorganises the law, with Section 423 addressing interest for defaults in furnishing returns of income. The 1961 Act remains relevant to earlier assessment years and proceedings covered by savings and transitional provisions. Do not automatically apply the new section number to an earlier assessment year or assume that the filing deadline is identical across years.

Frequently asked questions

Is interest under Section 234A charged even if the return is filed only a few days late?

Yes, if interest is otherwise payable, a part of a month is counted as a full month.

Is Section 234A the same as the late-filing fee?

No. Section 234A deals with interest, while Section 234F deals with a separate statutory fee.

Does a nil outstanding tax amount always result in Section 234A interest?

Ordinarily there is no interest where the correctly computed statutory interest base is nil, but the tax credits, updated-return rules and applicable assessment facts should be verified.

Can interest be recalculated after an appellate order?

Yes. Section 234A(4) provides for consequential adjustment when a qualifying order changes the tax amount on which interest is payable.

Official legal references

This article is general legal information. Check the applicable Finance Act, statutory text, notifications and filing extensions for the relevant year.