Press / to search

Chapter XIX - Collection and Recovery of Tax

Section 424

Section 424: interest for defaults in payment of advance tax

Section 424 charges interest where an assessee liable to pay advance tax either fails to pay it at all, or pays less than 90% of the "assessed tax" - the shortfall attracts simple interest at 1% per month running from the 1st of April following the tax year.

On this page

Need advice on Section 424?

This article is for general information. Refer to the Income-tax Act, 2025 as amended by the Finance Act, 2026 and the Taxation and Other Laws (Amendment) Act, 2026 for the official provisions. If you need professional advice for your situation, contact Bizeneed.

Contact us

Statutory text

Bare law

(1) Subject to the other provisions of this section, where, in any tax year, an assessee who is liable to pay advance tax under section 404,— (a) has failed to pay such tax; or (b) the advance tax paid by such assessee under the provisions of section 406 or 407 is less than 90% of the assessed tax, the assessee shall be liable to pay simple interest at the rate of 1% for every month or part of a month, for the period, beginning from the 1st April following such tax year— (i) upto the date of determination of total income under section 270(1); and (ii) upto the date of completion of regular assessment, where a regular assessment is made, on an amount equal to the assessed tax in case where clause (a) is applicable or, on the amount by which the advance tax paid as aforesaid falls short of the assessed tax in case where clause (b) is applicable.

(2) In sub-section (1), “assessed tax”means the tax on the total income determined under section 270(1) and where a regular assessment is made, the tax on the total income determined under such regular assessment as reduced by the amount of,— (a) any tax deducted or collected at source as per Chapter XIX-B on any income which is subject to such deduction or collection and which is taken into account in computing such total income; (b) any relief of tax allowed under section 157; (c) any relief of tax allowed under section 159(1) on account of tax paid in a country outside India; (d) any relief of tax allowed under section 159(2) on account of tax paid in a specified territory outside India referred to in that section; (e) any deduction, from the Indian income-tax payable, allowed under section 160, on account of tax paid in a country outside India; and (f) any tax credit allowed to be set off as per section 206(2)(e) to (h) and 206(3) and (4).

(3) For the purposes of this section,— (a) where in relation to a tax year, an assessment is made for the first time under section 279, the assessment so made shall be regarded as a regular assessment; (b) tax on total income as determined under section 270(1) shall not include the additional income-tax, if any, payable under section 267; (c) tax on the total income determined under such regular assessment shall not include the additional income-tax payable under section 267.

(4) Where, before the date of determination of total income under section 270(1) or completion of a regular assessment, tax is paid by the assessee under section 266 or otherwise,— (a) interest shall be calculated as per the foregoing provisions of this section up to the date on which the tax is so paid, and reduced by the interest, if any, paid under section 266 towards the interest chargeable under this section; (b) thereafter, interest shall be calculated at the rate aforesaid on the amount by which the tax so paid together with the advance tax paid falls short of the assessed tax.

(5) Where as a result of an order of reassessment or recomputation under section 279, the amount on which interest was payable in respect of shortfall in payment of advance tax for any tax year under sub-section (1) is increased, the assessee shall be liable to pay simple interest at the rate of 1% for every month or part of a month comprised in the period commencing on the 1st April immediately following such tax year and ending on the date of the reassessment or recomputation on such amount determined as per formula below:— A = B – C where,— A = the increased amount on which interest was payable in respect of shortfall in payment of advance tax for any tax year as a result of reassessment or recomputation; B = tax on total income determined on the basis of reassessment or recomputation; C = tax on total income determined under section 270(1) or regular assessment as referred to in sub-section (1).

(6) Where, as a result of an order under section 287 or 288 or 359 or 363 or 365(10) or 368 or 377 or 378, the amount on which interest was payable under sub-section (1) or (3) has been increased or reduced, the interest shall be increased or reduced accordingly, and— (a) in a case where the interest is increased, the Assessing Officer shall serve on the assessee a notice of demand in such form as may be prescribed specifying the sum payable and such notice of demand shall be deemed to be a notice under section 289 and the provisions of this Act shall apply accordingly; (b) in a case where the interest is reduced, the excess interest paid, if any, shall be refunded.

Introduction

Section 424 addresses non-payment or underpayment of advance tax by a person liable under section 404. It is triggered where no advance tax was paid or advance tax paid is below 90% of the section’s defined assessed tax.

The 1% monthly or part-month interest runs from 1 April following the tax year to the relevant determination or regular assessment date. Later changes to assessed tax can cause a corresponding recomputation.

Key takeaways

1

Ninety-percent test

Interest can arise if advance tax is unpaid or the amount paid is below 90% of assessed tax.

2

Monthly rate

The section states 1% simple interest per month or part month for its specified period.

3

Later adjustments

A changed assessed-tax amount can require a corresponding recomputation under the section.

When interest applies and the rate - Section 424(1)

"Subject to the other provisions of this section, where, in any tax year, an assessee who is liable to pay advance tax under section 404-- (a) has failed to pay such tax; or (b) the advance tax paid by such assessee under the provisions of section 406 or 407 is less than 90% of the assessed tax, the assessee shall be liable to pay simple interest at the rate of 1% for every month or part of a month, for the period, beginning from the 1st April following such tax year-- (i) upto the date of determination of total income under section 270(1); and (ii) upto the date of completion of regular assessment, where a regular assessment is made, on an amount equal to the assessed tax in case where clause (a) is applicable or, on the amount by which the advance tax paid as aforesaid falls short of the assessed tax in case where clause (b) is applicable."

What is 'assessed tax' - Section 424(2)

"Assessed tax" means the tax on the total income determined under Section 270(1), and, where a regular assessment is made, the tax on the total income determined under that regular assessment, reduced by:

  • Any tax deducted or collected at source under Chapter XIX-B on income taken into account in computing that total income
  • Relief of tax allowed under Section 157
  • Relief of tax allowed under Section 159(1) for tax paid in a country outside India
  • Relief of tax allowed under Section 159(2) for tax paid in a specified territory outside India
  • Deduction from Indian income-tax payable, allowed under Section 160, for tax paid in a country outside India
  • Any tax credit allowed to be set off under Section 206(2)(e) to (h) and Section 206(3) and (4)

Regular assessment, part-payment before assessment, and reassessment adjustments

For this section, where an assessment for a tax year is made for the first time under Section 279, it is treated as a regular assessment. Tax on total income under Section 270(1), and under regular assessment, does not include additional income-tax payable under Section 267.

Where, before the date of determination of total income under Section 270(1) or completion of a regular assessment, tax is paid by the assessee under Section 266 or otherwise, interest is calculated up to the date of that payment (reduced by interest already paid under Section 266), and thereafter recalculated on the amount by which the tax paid together with advance tax falls short of the assessed tax.

Where, as a result of an order of reassessment or recomputation under Section 279, the amount on which interest was payable for shortfall in advance tax is increased, the assessee is liable to simple interest at 1% per month for the period from 1 April following the tax year to the date of the reassessment or recomputation, on the amount computed by the formula A = B - C, where A is the increased amount on which interest was payable, B is the tax on total income determined on the basis of the reassessment or recomputation, and C is the tax on total income determined under Section 270(1) or the regular assessment.

Where an order under Section 287, 288, 359, 363, 365(10), 368, 377 or 378 increases or reduces the amount on which interest was payable under Section 424(1) or (3), the interest is increased or reduced accordingly - a fresh demand notice is served (treated as a Section 289 notice) if interest increases, and excess interest paid is refunded if it decreases.

Step-by-step flow for interest under Section 424

  1. 1

    Was the assessee liable to pay advance tax under Section 404 for the tax year?

    • No: Section 424 does not apply.
    • Yes: Go to the next step.
  2. 2

    Work out the assessed tax

    Tax on total income determined under Section 270(1), or under regular assessment if one is made (a first assessment under Section 279 counts as regular). Exclude additional income-tax under Section 267. Reduce it by tax deducted or collected at source under Chapter XIX-B, relief under Sections 157, 159(1) and 159(2), deduction under Section 160, and tax credit under Section 206(2)(e) to (h), 206(3) and (4).

  3. 3

    Did the assessee fail to pay, or pay under Section 406 or 407 less than 90% of the assessed tax?

    • No, paid 90% or more: No interest arises under Section 424(1).
    • Yes: Go to the next step.
  4. 4

    Compute interest

    Simple interest at 1% for every month or part of a month, from 1 April following the tax year up to the date of determination under Section 270(1), or completion of regular assessment. The base is the full assessed tax if nothing was paid, or the shortfall of advance tax against assessed tax.

  5. 5

    Was tax paid before the determination or assessment (under Section 266 or otherwise)?

    Interest is calculated up to the date of payment and reduced by any interest paid under Section 266 towards this interest; after that, interest runs only on the remaining shortfall (Section 424(4)).

  6. 6

    Later changes

    If reassessment or recomputation under Section 279 increases the amount, interest runs from 1 April after the tax year to the date of reassessment on A = B − C (Section 424(5)). Orders listed in Section 424(6) increase or reduce the interest; an increase is demanded by a notice deemed to be under Section 289, and a reduction is refunded.

Practical checklist

Do

  • Confirm advance-tax liability under section 404 before applying section 424.
  • Compute assessed tax using subsection (2), including the listed TDS/TCS and relief or credit reductions.
  • Compare actual advance tax paid with 90% of assessed tax; if triggered, use the statutory shortfall and period.
  • Reconcile interest after a later regular assessment or changed assessment order.

Avoid

  • Do not calculate the 90% test against total income rather than assessed tax.
  • Do not ignore a part of a month when counting the interest period.

Illustrative example

Worked example: advance tax below 90%

Hypothetical facts (illustration only, not a real taxpayer): For the tax year 1 April 2026 to 31 March 2027, Mr. Das was liable to pay advance tax. His tax on total income determined under Section 270(1) is an assumed ₹3,60,000, with assumed tax deducted at source of ₹60,000. He paid advance tax of ₹2,00,000. The determination is made on 20 August 2027. He paid no other tax before that date.

  1. Assessed tax

    ₹3,60,000 − ₹60,000 = ₹3,00,000.

  2. 90% test

    90% of ₹3,00,000 = ₹2,70,000. He paid ₹2,00,000, which is less, so Section 424(1)(b) applies.

  3. Shortfall

    ₹3,00,000 − ₹2,00,000 = ₹1,00,000.

  4. Period

    From 1 April 2027 to 20 August 2027: April, May, June and July in full, plus part of August, so 5 months.

  5. Interest

    ₹1,00,000 × 1% × 5 = ₹5,000.

Outcome

  • Interest under Section 424 on these assumed facts is ₹5,000.
  • Had he paid self-assessment tax before 20 August 2027, Section 424(4) would cut off interest on the amount paid from the date of payment.

Glossary

Assessed tax
The tax amount defined in subsection (2) after the statutory reductions, not simply the unadjusted assessed liability.
Advance-tax shortfall
The amount by which assessed tax exceeds advance tax paid; the below-90% condition determines whether the shortfall rule is triggered.

Frequently asked questions

What triggers interest under Section 424?

Either failing to pay advance tax at all, or paying less than 90% of the "assessed tax" as defined in Section 424(2), when the assessee was liable to pay advance tax under Section 404.

What is the interest rate under Section 424?

Simple interest at 1% for every month or part of a month, from 1 April following the relevant tax year until the total income is determined under Section 270(1) or, if a regular assessment is made, until it is completed.

Is the 90% threshold based on the tax I paid, or on the final assessed tax?

It compares the advance tax actually paid under Sections 406 or 407 against "assessed tax" - broadly the tax on total income determined under Section 270(1) or the regular assessment, reduced by TDS/TCS and specified reliefs and credits.

Need help applying this provision to your situation?

Calculate your interest for advance tax shortfall

Last updated 10 October 2026