About this tool

Advance Tax Interest 234B 234C Calculator

Interest payable under Sections 234B and 234C for shortfall and deferment of advance tax instalments.

This calculator works out the interest you owe under Section 234B for paying less than 90% of your tax as advance tax, and under Section 234C for missing the 15 June, 15 September, 15 December and 15 March instalment percentages. It applies the 1% per month simple rate, the 12% and 36% safe harbours for the first two instalments, and the Rule 119A rounding to the nearest ₹100. It is meant for freelancers, consultants, traders and salaried people with big capital gains or interest income who pay tax outside TDS.

How to use Advance Tax Interest 234B 234C Calculator

1. 1

   Open Advance Tax Interest 234B 234C Calculator on AltFTool — it loads instantly in your browser.

2. 2

   Enter the values you already know.

3. 3

   Fine-tune the options to match your scenario.

4. 4

   Read the result and use it in your planning or reporting.

Why use Advance Tax Interest 234B 234C Calculator

• Instalment-level breakdown

  Shows the required amount, what you paid and the interest for each of the four due dates.

• Safe harbours applied

  Automatically waives 234C where 12% is paid by 15 June or 36% by 15 September.

• Correct 234B month count

  Counts from 1 April of the assessment year and treats any part of a month as a full month.

Common use cases

• A freelancer who paid nothing by 15 June and caught up only in December, checking how much 234C deferment interest that costs.
• A salaried taxpayer with large capital gains filing in July, estimating 234B interest from 1 April of the assessment year to the day the self-assessment tax is paid.
• A 44ADA professional confirming that a single 15 March payment of the full liability avoids 234C entirely.

Frequently asked questions