Interest Calculator (234A, 234B, 234C)
Calculate penalty interest for late filing and non-payment of advance tax.
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Interest Calculation
Enter details to calculate interest.
Interest Under Section 234
Section 234A - Late Filing
Rate: 1% per month (part month = full month)
On: Outstanding tax (Total tax - TDS - Advance Tax)
Period: From due date to actual filing date
Example: Due date 31-Jul, Filed 15-Oct
Months = 3 (Aug, Sep, Oct counted as full)
Interest = Outstanding Tax × 1% × 3
Section 234B - Non-payment of Advance Tax
Rate: 1% per month
On: Amount by which advance tax falls short of 90%
Period: From 1st April to filing date
Applicable when: Advance tax paid < 90% of assessed tax
Interest = Shortfall × 1% × Months
Section 234C - Deferment of Advance Tax
Rate: 1% per month × 3 months (per installment)
On: Shortfall in each installment
Due Dates: Cumulative %
15-Jun 15%
15-Sep 45%
15-Dec 75%
15-Mar 100%
FAQs
All three sections charge interest at 1% per month or part of month. It's simple interest, not compounded.
Yes, even 1 day delay in a month counts as a full month for interest calculation.
If tax liability (after TDS) is less than ₹10,000, you're not required to pay advance tax and 234B/234C won't apply.
Yes, you may be liable to pay interest under all three sections simultaneously depending on your tax payment and filing pattern.
Disclaimer: For estimation only. Actual interest computed by CPC.