How this calculation works
Turn an estimated annual tax bill into the additional payment needed by one selected instalment date. TDS/TCS and tax credits reduce the annual advance-tax base; advance tax already paid reduces the cumulative amount due by that date. Keeping those fields separate prevents the same payment being deducted twice.
Worked example
This example uses illustrative inputs. Your current result is shown above.
Enter estimated annual tax ₹2,00,000, TDS/TCS ₹50,000, other credits ₹0, advance tax already paid ₹25,000, regular schedule and September, with the senior exemption unchecked. Annual liability is ₹1,50,000. September’s cumulative 45% is ₹67,500, so an additional ₹42,500 is due; ₹82,500 remains for later instalments.
Assumptions and limits
- This retains the site’s scoped Tax Year 2026–27 instalment model; the annual tax estimate must already include applicable tax and cess.
- Already paid means advance tax, not TDS/TCS or credits entered in the other fields.
- The form does not calculate late-payment interest, verify presumptive-scheme eligibility or establish the resident-senior exemption conditions.
Questions people ask
Is September’s 45% in addition to June’s 15%?
No. It is cumulative. Advance tax already paid is subtracted from the 45% target, so paying the full 45% again without that subtraction would overpay the modelled instalment.
What if I have already paid more than the selected target?
The additional payment is zero. The remaining-for-year result can still be positive because a later cumulative target may be higher.
Will this tell me the interest for missing an instalment?
No. It shows the scheduled principal tax payment under the inputs. Late or insufficient-payment interest requires dates and further rules not included here.