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Archive / Investment Adviser (Level 2) / Capital Gains
nism-series-xb-section-234a-penal-interest-late-itr-filing[ INVESTMENT ADVISER (LEVEL 2) ]

Under Section 234A of the Income Tax Act, what is the penal interest rate levied on unpaid taxes when a taxpayer fails to file their ITR by the statutory due date under Section 139(1)?

[ A ]50.0% interest per day.
[ B ]Zero interest.
[ C ]Simple interest at the rate of ONE PERCENT (1.0%) per month (or part of a month) on the unpaid tax liability, calculated from the day immediately following the due date to the actual date of return filing.[ CORRECT ]
[ D ]Flat ₹100 fine.
Takeaway

The correct answer is C: Section 234A charges simple interest of 1% per month (or part thereof) on unpaid tax, running from the day after the Section 139(1) due date until the actual date of filing the return.

Derivation
This interest is compensatory, not punitive in the criminal sense -- it exists because the government is owed tax that hasn't yet reached it, so 1% per month approximates the time value of the delayed payment. Importantly, the interest is charged on the net unpaid tax liability (self-assessment tax outstanding after TDS/advance tax credits), and even a partial month of delay counts as a full month for calculation purposes. A taxpayer who owes no tax after credits (e.g., full TDS coverage) faces no Section 234A interest even if the return itself is filed late, which is a nuance the exam sometimes layers onto this basic rate question.
Why the others fail
A — 50.0% interest per day.
Wildly overstated; the statutory rate is 1% per month, not 50% per day -- a figure many orders of magnitude beyond the actual penal interest rate.
B — Zero interest.
Incorrect; Section 234A does impose interest on unpaid tax for late ITR filing, it is not a zero-interest provision.
D — Flat ₹100 fine.
Understates the mechanism; Section 234A is a percentage-based monthly interest charge on outstanding tax, not a flat ₹100 fine.