Advance tax and interest
Assumptions
Advance tax applies when tax after TDS is ₹10,000 or more. Cumulative instalments of 15%, 45%, 75% and 100% fall due on 15 June, 15 September, 15 December and 15 March; presumptive taxpayers pay in one instalment by 15 March. Interest under Section 234C is 1% a month for three months on each of the first three shortfalls (one month for March), waived for June and September when at least 12% and 36% have been paid. Section 234B adds 1% a month from 1 April after the year when less than 90% was paid; the results show the projected monthly cost. Tax is rounded to the nearest ₹100 and part months count as full months. Capital-gain timing, TCS and relief claims are not modelled.
Rules: 2026–27 (tax year), reviewed 2026-09-11.
TaxBuddy · advance tax and interest (secondary)
Estimates are not personalised financial advice. Review assumptions before use.
Due at the next instalment (2026-09-15)
Based on your inputs. Not guaranteed.
Instalments due and paid
Bars are cumulative amounts due; the caption shows what had been paid. Interest accrues only on the dates already passed.Bars are cumulative amounts due; the caption shows what had been paid. Interest accrues only on the dates already passed.
View detailed breakdown
When does interest start?
Section 234C runs from each missed instalment date; Section 234B starts on 1 April after the year if less than 90% was paid.
Detailed results
| Result | Value |
|---|---|
| Due at the next instalment (2026-09-15) | ₹45,000 |
| Tax after TDS | ₹1 lakh |
| Advance tax applies | 1 yes |
| Paid to date | ₹0 |
| Section 234C interest accrued to the date entered | ₹450 |
| Projected Section 234B interest per month from 1 April | ₹1,000 |
| Shortfall against 90% that triggers 234B | ₹1 lakh |
Interest is computed on rounded shortfalls for the instalment dates that have passed as of the date entered.
Cash flow table
| Period | Cumulative due | Cumulative paid |
|---|---|---|
| 2026-06-15 · 15% | ₹15,000 | ₹0 |
| 2026-09-15 · 45% | ₹45,000 | ₹0 |
| 2026-12-15 · 75% | ₹75,000 | ₹0 |
| 2027-03-15 · 100% | ₹1 lakh | ₹0 |