Down Payment Savings Calculator

• Shows both the time to reach your goal at your current contribution, and the contribution needed for a specific timeframe.
• Works for any savings goal, not just a home — the math is the same for any target amount.
• Optionally models a contribution that grows every year, e.g. with a raise.
• A high-yield savings account or money-market rate is the typical assumption for a near-term goal like this.

How to use this calculator

Enter the home price you're targeting and the down payment percentage you want to reach — 20% avoids PMI on most conventional loans, but plenty of loan programs allow less. Add what you've already saved toward this goal and how much you're contributing every month, along with an expected rate of return on wherever that money sits.

The target timeframe field does double duty: it shows what your current contribution is projected to grow to by that point, and — if that falls short — exactly how much you'd need to contribute instead to hit the goal right on schedule.

How the projection works

This uses the same compound-growth math as any savings projection: existing savings grow at the return you enter, and each month's contribution is added and then also has time to grow before the goal date arrives.

Future value = (current savings × growth factor)
             + (monthly contribution × annuity growth factor)

Working the formula in reverse — solving for the monthly contribution instead of the ending balance — is how the "contribution needed for your timeframe" figure is calculated.

A worked example

Saving toward a $400,000 home with a 20% down payment means a goal of $80,000. Starting from $10,000 already saved, contributing $600 a month at a 4.5% return, that goal is projected to be reached in about 93 months — just under 8 years. Targeting a 3-year timeframe instead would require raising the monthly contribution substantially, which the calculator shows directly.

Where to actually keep this money

The return rate assumption matters enormously for how this projection plays out, and it should reflect where the money actually sits. For most people saving toward a purchase within the next few years, that means a high-yield savings account, a money-market fund, or short-term CDs — not the stock market. A down payment fund that needs to be available on a specific timeline is a poor candidate for an investment that could be worth meaningfully less exactly when the money is needed.

Assumptions and limitations

• The rate of return is held flat. A real savings account's rate can change, and any market-based account will fluctuate — this shows a single steady-rate projection, not a range of outcomes.
• No taxes on interest earned are modelled. Interest in a standard savings account is taxable income in the year it's earned.
• The required-contribution figure assumes a flat contribution for the target timeframe, even when an annual increase is modelled for the main projection.

Common mistakes

Chasing a higher return with the down payment fund itself. The purpose of this money is to be there, in full, on a specific date — not to maximize growth. A market downturn shortly before closing can undo years of saving.

Forgetting the extras. The down payment itself is usually not the only cash needed at closing — closing costs typically add another 2%–5% of the purchase price, and a post-move cash reserve is worth budgeting for separately from this goal.

Not revisiting the plan as the target home price moves. In a market where prices are rising, a fixed dollar goal set today may not match the actual price by the time enough is saved — revisiting the numbers every few months keeps the target realistic.

Frequently asked questions