Advance tax trigger
Advance Tax Interest Estimator
Calculate advance tax shortfall with 234B and 234C interest
Enter your net tax liability and cumulative advance tax paid by due dates to estimate section-wise interest and total amount payable.
FY-based AY logic
Section 234B + 234C
Due-date shortfall table
234B rule used
Less than 90% paid
Interest rate
1% per month
Enter advance tax details
Use cumulative advance-tax paid up to each due date.
Before you calculate
- Enter net tax components after considering TDS/TCS and eligible reliefs/credits.
- Installment fields are cumulative values (non-decreasing by due date).
- 234B is computed from 1 April of assessment year up to self-assessment payment month.
Advance tax interest guide for Sections 234B and 234C
This page is built to calculate assessed tax, compare it against due-date-wise advance tax payments, and estimate interest under Sections 234C and 234B. The June, September, December, and March fields should be filled using the cumulative advance tax paid up to each installment due date, not fresh standalone payments for each month.
The estimate becomes more reliable when the total tax liability, TDS or TCS credit, reliefs, and self-assessment payment date are all entered correctly. That helps the calculator show whether the shortfall triggers only installment-wise 234C interest, a later 234B exposure, or both.
Use cumulative installment totals
Each due-date field should reflect the amount paid up to that point in the financial year. If cumulative and incremental numbers are mixed, the shortfall and interest output will be misleading.
Separate 234C from 234B
Section 234C focuses on missed installment percentages during the year, while Section 234B generally applies when the overall advance tax paid remains short against the assessed tax base.
Self-assessment date changes interest
The self-assessment payment date affects the 234B month count in the calculator. A later payment date can increase the interest estimate even if the tax shortfall is unchanged.
Advance tax interest calculator FAQs
Should the June, September, December, and March fields be cumulative?
Yes. Each field should represent the cumulative advance tax paid up to that due date, because that is the basis used for the installment shortfall comparison.
What is the difference between Section 234B and Section 234C here?
234C covers due-date-wise shortfalls during the financial year, while 234B applies when the overall advance tax paid is insufficient against assessed tax and remains unpaid into the assessment year.
Should I enter total tax liability before or after TDS and relief credits?
Enter the total tax liability field as requested by the form and separately enter TDS, TCS, and relief credits so the calculator can derive the net tax base correctly.
Why does the self-assessment payment date change the 234B amount?
The calculator uses that date to estimate how many months of 234B interest apply from the assessment-year start until payment, so a later payment month can increase interest.
Can this page help if I missed only one advance tax installment?
Yes. The 234C table is useful for isolating due-date-wise shortfalls, so you can see whether one missed installment or repeated underpayments drove the result.
Is this calculator enough for the final tax payment amount?
No. It is a planning estimate and should be checked against the final assessed tax position, credits, challans, and filing-year compliance records.