Interest Under Sections 234A, 234B & 234C: Penalty for Late or Short Tax Payment

The Common Thread: 1% Per Month

Sections 234A, 234B, and 234C each levy simple interest at 1% per month or part of a month on the relevant shortfall amount. "Part of a month" means even a single day's delay counts as a full month for interest computation - there's no proportionate calculation.

Section 234A: Interest for Late Filing of Return

If you file your ITR after the due date, and there is tax payable (i.e., self-assessment tax that wasn't already paid via TDS/advance tax), interest under Section 234A is charged at 1% per month from the day after the due date until the date of actual filing, on the unpaid tax amount.

Section 234B: Interest for Default in Payment of Advance Tax

Section 234B applies if you were liable to pay advance tax (i.e., your total tax liability for the year, after TDS, exceeds ₹10,000) but either:

• Did not pay any advance tax at all, or
• Paid less than 90% of the assessed tax as advance tax

Interest is charged at 1% per month from 1 April of the assessment year until the date of payment of self-assessment tax (or completion of assessment), on the shortfall between 90% of the assessed tax and the advance tax actually paid.

Section 234C: Interest for Deferment of Advance Tax Instalments

Even if you pay 90%+ of your tax by year-end (avoiding 234B), you can still owe interest under 234C if you didn't pay advance tax on time, in each instalment. The advance tax schedule for individuals/non-corporate assesses is:

If the cumulative advance tax paid by each due date is less than the required percentage, interest at 1% per month is charged on the shortfall for that instalment - typically for 3 months for the first three instalments and 1 month for the last, though the exact period and formula vary slightly by case.

Can All Three Apply Simultaneously?

Yes. It's entirely possible for a taxpayer to owe interest under 234A (late filing), 234B (insufficient total advance tax), and 234C (instalments not paid on schedule) all in the same year - for example, someone with significant capital gains late in the year who didn't revise their advance tax estimate and then also filed their return late.

How to Avoid These Charges

• 234A: File your ITR by the due date, even if you can't pay the full tax immediately (file with whatever self-assessment tax you can, to minimize the base on which interest accrues).
• 234B: Estimate your annual tax liability early and ensure advance tax + TDS covers at least 90% of it by 31 March.
• 234C: Pay advance tax instalments on the prescribed dates, recalculating your estimate each quarter - especially important if you have variable income like capital gains, freelance income, or bonuses.