However, the interest is not levied simply because the return is filed late. Its applicability depends on whether any tax remains payable after adjusting TDS, advance tax and eligible tax credits.
Who has to pay interest under Section 234A?
Section 234A applies when a taxpayer files the return after the prescribed due date and has unpaid tax outstanding. The interest is charged at 1% per month or part of a month on the unpaid amount, beginning from the day after the due date until the date the return is filed.
According to Pranav Sai S, Tax Expert at ClearTax, an Indian cloud-based tax and financial software platform, taxpayers often assume that every belated return attracts interest, which is not the case.
“If the entire tax liability has already been discharged through TDS, advance tax or eligible tax credits by the due date, interest under Section 234A may not apply. However, other consequences, such as a late filing fee under Section 234F, may still be applicable,” he said.
Deepashree Shetty, Partner, Global Mobility Services, Tax and Regulatory Advisory, BDO India, the Indian member firm of BDO, the world’s fifth-largest professional services and accounting network, echoed this view, saying the levy is linked to the unpaid tax amount and not merely to delayed filing.
Experts also point out another common misconception, that the interest is calculated on the total income or total tax liability. Instead, it is computed only on the net tax payable after adjusting TDS, advance tax, tax reliefs and eligible tax credits.
They also caution that because the law treats part of a month as a full month, even a short delay can increase the interest payable if tax remains outstanding.
How is the interest calculated?
Section 234A prescribes an interest rate of 1% per month or part of a month on the outstanding tax amount.
For example, if a taxpayer has an unpaid tax liability of ₹20,000 and files the return one month after the due date, the interest payable would be ₹200. If the return is filed two months and a few days late, the delay is treated as three months, taking the interest to ₹600.
Sandeep Sehgal, Partner-Tax, AKM Global, a professional services firm headquartered in the Delhi-NCR region, illustrates this with another example. If a taxpayer has an outstanding tax liability of ₹40,200 and files the return on September 12, 2026, assuming the due date was July 31, 2026, the period from August 1 to September 12 is treated as two months. The resulting interest works out to ₹804.
Similarly, a taxpayer with an unpaid tax liability of ₹15,000 who files the return just two days after the due date would still be liable to pay ₹150 as interest because even a part of a month is counted as a full month.
Section 234A interest is different from the late filing fee
Tax experts say Section 234A and Section 234F are often confused, although they address different aspects of tax compliance.
According to Sehgal, clearing the entire self-assessment tax before filing does not necessarily mean there will be no financial consequence for filing late. While interest under Section 234A may not arise if there was no outstanding tax after the due date, a late filing fee under Section 234F may still be payable, depending on the taxpayer’s case. Put simply, Section 234A relates to delayed payment of tax, while Section 234F deals with delayed filing of the return.
How can taxpayers avoid additional interest?
Experts advise taxpayers to reconcile their tax liability well before the filing deadline by matching TDS details with Form 26AS and the Annual Information Statement (AIS) and ensuring all sources of income, including bank interest, capital gains and freelance income, have been reported correctly. Any remaining self-assessment tax should be paid before filing the return.
Pranav Sai S also recommends avoiding last-minute filing, as technical glitches or incomplete documentation can delay submission. Shetty added that taxpayers should view Section 234A as a charge on delayed tax compliance rather than merely a consequence of filing late, making timely tax reconciliation and payment essential.
