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Income Tax Calculator
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Financial Calculator
A time-value-of-money solver like a BA II Plus: enter any four of N, I/Y, PV, PMT and FV to solve the fifth.
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
The TVM equation
PV × (1+i)^N + PMT × (1 + i·BGN) × ((1+i)^N − 1) ÷ i + FV = 0
i = (I/Y ÷ 100) ÷ P/Y
This is the same equation financial calculators use. Example: a $300,000 mortgage at 6.5% for 360 months: PV = 300,000, FV = 0 → PMT ≈ −$1,896.20 (negative because you pay it). I/Y is solved numerically.
Frequently asked questions
Why is my answer negative?
Because of the sign convention: payments you make are negative cash flows.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Expert review pending
- Last updated
- 31 Oct 2026
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