How is interest under section 234B and 234C charged?

What rate do 234B and 234C charge?

Section 234B and section 234C both charge simple interest at 1% per month, or part of a month, on advance-tax shortfalls under the Income-tax Act, 1961. They are two separate defaults. Section 234B looks at whether you paid enough advance tax across the whole year. Section 234C looks at whether each instalment was paid on time. The rate is written into the sections, so it does not move with each Finance Act.

Advance tax itself is due under section 208 when your estimated tax liability for the year is 10,000 rupees or more after deducting TDS and TCS. If that threshold is crossed and the tax is not paid on schedule, one or both of these interest sections can apply.

When does section 234B apply?

Section 234B applies when the advance tax you paid is less than 90% of your assessed tax, or when you were liable to pay advance tax and paid none. The interest is simple interest at 1% per month, computed from 1 April of the assessment year until the date the shortfall is cleared.

The base for section 234B is the assessed tax, which is the tax on total income reduced by TDS, TCS, and reliefs such as those under sections 90, 90A, and 91. Because it uses assessed tax, an addition made during assessment can increase the 234B interest even after the return was filed.

Does self-assessment tax paid before filing stop 234B?

Self-assessment tax paid under section 140A stops section 234B interest from the month of payment, but does not erase the interest already accrued from 1 April of the assessment year. Paying the shortfall on 20 July of the assessment year still leaves roughly four months of 1% monthly interest on that amount.

When does section 234C apply?

Section 234C applies when an advance-tax instalment is paid short of its cumulative target on the instalment due date. It charges simple interest at 1% per month on the shortfall for a fixed period tied to that instalment. The base is the tax due on the returned income, not the assessed income.

The four instalment dates for most taxpayers are 15 June, 15 September, 15 December, and 15 March. Each date carries a cumulative percentage the payment must reach. Falling below the target for a date triggers 234C for that quarter, even if you pay the full tax later in the same year.

Is there a relief for the first two dates?

Section 234C gives a safe harbour for the 15 June and 15 September dates. No 234C is charged for the June instalment if you have paid at least 12% of the tax due, and none for the September instalment if you have paid at least 36%, provided the shortfall is because of the treatment of certain income the taxpayer could not have estimated earlier, such as capital gains or dividend income. Read the proviso to section 234C for the exact conditions before relying on it.

How do 234A, 234B and 234C differ?

Sections 234A, 234B, and 234C each charge simple interest at 1% per month, but for three different defaults. The table separates what each one penalises so you can tell which interest a demand relates to.

All three can appear on the same intimation. A taxpayer who filed late, underpaid advance tax overall, and missed instalment dates can be charged under 234A, 234B, and 234C at once, each on its own base and period.

What are the advance-tax instalment targets?

Section 234C tests each advance-tax instalment against a cumulative percentage of the tax due on the returned income. The table shows the four dates and their targets for taxpayers other than those under the presumptive schemes.

Taxpayers who declare income under the presumptive schemes in section 44AD or 44ADA follow a single instalment. They pay the whole advance tax by 15 March, and section 234C tests only that one payment.

How long does 234C run on each instalment?

Section 234C charges 1% a month for three months on a shortfall at the 15 June, 15 September and 15 December dates, and for one month on a shortfall at 15 March. The period is fixed by the section rather than by how long the money stayed unpaid, so clearing a June shortfall in July still carries the full three months.

How do I verify a 234B demand?

1. Open the section 234B page on the Income Tax Department site and read the 90% test and the 1% per month rate in the operative text.
2. Open the section 234C page and confirm the instalment percentages and dates for your taxpayer type.
3. Check whether you fall under the presumptive schemes, because the instalment schedule differs for section 44AD and 44ADA.
4. Recompute against the tax on your returned income for 234C, and against assessed tax for 234B, so you know which base a demand used.

Why do 234B and 234C computations go wrong?

• Assuming full payment by 31 March avoids 234C. It does not, because 234C tests each instalment date separately.
• Computing 234B on returned income. Section 234B uses assessed tax, so a scrutiny addition can raise it.
• Treating the interest rate as something that changes yearly. The 1% per month rate is fixed in the section, not set by notification.
• Ignoring the section 234C safe harbour for the June and September dates when the shortfall is due to capital gains or similar income.
• Forgetting that TDS and TCS reduce the advance-tax base, so the 10,000 rupee liability threshold is measured after them.

Where are advance-tax procedure changes published?

Advance-tax procedure changes are published as CBDT circulars, e-Filing portal releases and challan or utility updates, while the 1% monthly rate and the 90% test stay inside sections 234B and 234C themselves. Complied AI keeps CBDT updates in one feed so you can open the source behind a change, then read the section 234B text beside it when the exact wording matters.