How Much to Save Each Month to Reach a Goal

A savings goal becomes manageable once it turns into a monthly number. You need three inputs: the target, what you already have, and the time until you need the money.

A worked example

Suppose you want $30,000 for a down payment in four years and already have $5,000.

Assumed return	Monthly saving needed
0% (cash kept aside)	$520.83
4% a year (high-yield savings)	$464.48

At 4%, your existing $5,000 grows to about $5,866, and you contribute about $22,295 over the four years. Interest covers roughly $2,700 of the goal, trimming about $56 a month off the target.

Set your own goal in the savings goal calculator.

Choosing a realistic return

Match the return to how soon you need the money. For goals within a few years, savings accounts and similar cash options are common because the balance won't fall. Stock market returns are higher on average but can drop sharply right before your deadline. Plan with a cautious rate, and treat anything extra as a bonus.

Make it automatic

Set up a transfer on payday into a separate account named for the goal. Review it once or twice a year. If you fall behind, raise the monthly amount or extend the deadline rather than abandoning the goal.

Keep this money separate from your emergency fund, so an unexpected bill doesn't wipe out progress toward the goal.

Source: Investor.gov: Asset allocation and time horizons.