Sinking Fund Calculator

Find the exact monthly contribution to hit a savings target by your deadline, with optional interest and a split of deposits versus interest earned.

Frequently Asked Questions

How much should I save each month to reach a goal?

Without interest, monthly contribution = target amount ÷ number of months. To reach $12,000 in 24 months, save 12,000 ÷ 24 = $500 per month. This is general information, not financial advice.

How does interest change the contribution?

With a monthly rate i over n months, the annuity formula gives payment = target × i ÷ ((1 + i)ⁿ − 1). Earning interest means each payment is smaller than the simple target ÷ months figure.

What is a sinking fund used for?

A sinking fund sets aside money regularly for a known future expense - a car, taxes, a vacation, or a large bill - so the cost is spread out instead of hitting all at once. It turns a lump-sum goal into manageable monthly amounts.

How do I handle an existing starting balance?

Subtract the future value of your current savings from the target, then solve for the contribution on the remainder. With $2,000 already saved toward a $12,000 goal, you only need to fund the remaining $10,000 over your timeline. Consult a financial professional for personal advice.

What is the difference between a sinking fund and an emergency fund?

An emergency fund covers unexpected costs (job loss, breakdowns) and is left untouched. A sinking fund is built for a known, planned expense (a vacation, annual taxes, an insurance premium) and is meant to be spent on the date you planned for.

Should I use a savings account or a CD?

It depends on when you need the money. For goals under 12 months, a high-yield savings account is more flexible. For goals 1-3 years out, a CD ladder maturing near the target date can offer a higher guaranteed rate.

What if my current savings already exceed the target?

The calculator detects this condition and shows you a message. You do not need to contribute anything more; the money you already have, once compounded, will cover the goal.

Does the calculator use monthly compound interest?

Yes. It assumes monthly compounding, which is standard for most savings accounts. Daily compounding differs only trivially at these rates and timeframes.

Can I use this calculator to save for a home down payment?

Yes. Enter the down payment amount as the target and the number of months until you plan to buy. The tool will tell you exactly how much to set aside each month.

Financial Disclaimer: Estimates only. Not financial advice.

This calculator provides estimates for informational purposes only. Actual financial outcomes depend on market conditions, personal circumstances, and decisions. Not financial advice. Consult a certified financial planner before making financial decisions affecting your future.