How to use this calculator
- Enter future balloon liability, existing earmarked savings, months until due, savings annual effective return (%).
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Earmarked savings and liability are modeled separately; constant return, no fees, tax or default risk.
Worked example
For the sample inputs shown above, sinking fund for balloon liability produces a first result of approximately 1000. The assumptions below explain what this result represents.
What the result means
Find a fixed month-end savings contribution to fund a future balloon payment.
Common questions
How is the calculation performed?
Required monthly deposit=max(0,(target−initial×(1+r)^n)/annuity factor), r=(1+annual return)^(1/12)−1.
What does the model leave out?
Earmarked savings and liability are modeled separately; constant return, no fees, tax or default risk.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.