Find how much to set aside each month to have a planned expense fully funded by its due date — the antidote to surprise bills.
A sinking fund spreads a known future expense into equal monthly savings. With interest, the required contribution is a little lower because your balance grows. Assumes steady monthly deposits. General information only.
A sinking fund turns a big irregular expense — insurance, holidays, a car repair, property tax — into a small, predictable monthly amount. Divide what you still need by the months you have (a bit less if it earns interest) and set that aside every month, so the bill is already paid when it lands.
Monthly = amount still needed ÷ months (reduced slightly by interest)
A sinking fund is for expected costs with a known date and amount; an emergency fund is for the unexpected. Running several sinking funds keeps big planned bills from becoming emergencies.
A high-yield savings account earns interest while keeping the money accessible — which slightly lowers what you need to contribute each month.
Related: savings goal calculator · emergency fund calculator · CD calculator · all free calculators.
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It uses standard formulas and recalculates the moment you change a value, so the math is exact for the inputs you enter. Treat the result as a reliable planning estimate; for decisions with legal or tax consequences, confirm the figures with a qualified professional.
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Last reviewed: September 2026. Free to use, no signup — Sinking Fund Calculator by ToolWise Digital.
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