How Much Should You Save Each Month?

Define the goal before calculating the monthly amount

Specify the amount, goal date and whether the amount is expressed in today's dollars or future dollars. Include current savings that are genuinely assigned to the goal. Money reserved for emergencies or another purpose should not be counted twice.

The calculator can then estimate the recurring deposit needed under a chosen return. The answer is sensitive to timing, so use the actual pay schedule when possible.

Start with a version that needs no market forecast

Suppose you need $18,000 in three years and already have $6,000 reserved for that goal. With a fixed future-dollar target and zero growth, the remaining $12,000 requires about $333.33 a month for 36 months. A real transfer of $334 would provide a small rounding cushion.

If you can save only $250 a month, those deposits plus your existing savings reach $15,000, leaving a $3,000 gap. Keeping the original $18,000 goal and extending the schedule to 48 months brings the required deposit down to $250.

These comparisons set interest, taxes, fees and inflation to zero so you can see the tradeoff clearly. Then use the calculator to test your actual account assumptions or a target expressed in today's dollars. Neither a higher rate nor a later date should be slipped into the plan unnoticed.

For education costs spread across several school years, use the college savings calculator rather than treating every tuition payment as due on one day.

Use a return that fits the time horizon

Short-term goals usually need accessible assets with limited volatility. Depending on the goal and required access, examples to evaluate include appropriately insured deposit accounts, certificates of deposit and Treasury securities. A high stock-market assumption may make the monthly number look easier while increasing the chance that the balance is down when the money is needed.

For a long-term goal, compare several returns and subtract expected fees. Use an after-tax return when recurring interest or gains are expected to be taxable. If the target is inflation-adjusted, avoid mixing a real return with an additional inflation adjustment.