Advance Tax Calculator & §234B/234C Interest

See your advance-tax installment schedule (15/45/75/100%) and an estimate of the §234B and §234C interest if you've underpaid. Free, instant, no sign-up.

Advance tax is due if your total tax after TDS exceeds ₹10,000 in a year. Estimate — the §234C relief thresholds (12% by Jun, 36% by Sep) are applied.

Installment schedule
By 15 Juncumulative 15%
₹30,000pay ₹30,000 more
By 15 Sepcumulative 45%
₹90,000pay ₹90,000 more
By 15 Deccumulative 75%
₹1,50,000pay ₹1,50,000 more
By 15 Marcumulative 100%
₹2,00,000pay ₹2,00,000 more
Estimated interest exposure₹18,100
§234C — deferment of installments₹10,100
§234B — shortfall₹8,000
Let OnGravy project your advance tax from real books

OnGravy estimates each installment from your live P&L and TDS credits, and reminds you before every due date — so §234B/C interest never accrues.

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Pay on schedule, avoid the interest

Advance tax is paid in four installments across the year. Miss a cumulative target and §234C charges 1%/month on the shortfall; pay less than 90% of your total tax as advance and §234B charges 1%/month from April until you settle. Both are avoidable simply by paying the right amount by each date.

Frequently asked

Who has to pay advance tax?

Anyone whose total tax liability after TDS exceeds ₹10,000 in a financial year must pay advance tax in installments. This includes businesses, professionals and individuals with significant non-salary income.

What are the advance tax due dates?

For non-presumptive taxpayers: 15% by 15 June, 45% (cumulative) by 15 September, 75% by 15 December, and 100% by 15 March. Presumptive taxpayers under 44AD/44ADA pay 100% by 15 March.

What is the difference between §234B and §234C?

§234C is interest for deferring an installment — paying less than the required cumulative percentage by each due date. §234B is interest for paying less than 90% of your total tax as advance tax, charged from 1 April of the assessment year until you pay. Both are 1% per month.

How is §234C interest calculated?

It is 1% per month on the shortfall at each installment — three months for the June, September and December installments and one month for March — with relief if you've paid at least 12% by June and 36% by September.