Finance

Sinking Fund Calculator

Calculate the periodic payment needed to reach a future value. Plan your savings with a sinking fund strategy.

$
%
years
Required payment
$321.99
Per month
Future value
$50,000
Interest rate
5%
Time period
10 years
Total payments
120
Total contributions
$38,639
Interest earned
$11,361
Final value
$50,000

What Is a Sinking Fund?

A sinking fund is a savings strategy where you set aside money regularly to save for a specific future expense. The periodic payments, combined with compound interest, grow to reach your target amount.

The Sinking Fund Formula

Payment=FV×r(1+r)n−1\text{Payment} = \frac{FV \times r}{(1 + r)^n - 1}

Where:

  • FV = Future value (target amount)
  • r = Interest rate per period
  • n = Total number of periods

Common Uses

Sinking funds are useful for:

  • Saving for a down payment on a house
  • Building an emergency fund
  • Saving for a car purchase
  • Planning for large expenses like vacations or weddings
  • Business equipment replacement funds

Example Calculation

To save $50,000 in 10 years with a 5% annual return and monthly payments:

  • Future value = $50,000
  • Monthly rate = 5% / 12 = 0.417%
  • Total periods = 10 * 12 = 120 months
Payment=50000×0.00417(1.00417)120−1=208.330.647≈$322\begin{aligned} \text{Payment} &= \frac{50000 \times 0.00417}{(1.00417)^{120} - 1} \\[0.5em] &= \frac{208.33}{0.647} \\[0.5em] &\approx \$322 \end{aligned}

Tips for Success

  • Start early to benefit from compound interest
  • Choose an appropriate interest rate based on your investment choices
  • Be consistent with your payments
  • Consider automatic transfers to ensure regular contributions