Rent vs Buy Decision Guide

What Does It Cost to Tie Up Your Down Payment in a Home?

Buying converts cash into home equity, while renting can leave the down payment and some monthly savings available for investment. This guide makes that trade-off visible in the same model used by the calculator.

In this $500,000 example, the renter's alternative portfolio is compared with the homeowner's equity at every modeled year. Under the default 6% investment-return assumption, buying reaches a durable net-worth break-even point in Year 5.

Starting investable cash

$103,000

Cash the renter can keep invested instead of using it to close on the home.

Renter portfolio at Year 10

$239,896

Includes starting cash, modeled monthly contributions, and investment growth.

Renter portfolio at Year 30

$794,106

Compared with $1,152,950 of modeled home equity.

How the renter portfolio compounds

The renter starts with the cash not used at closing. When renting is cheaper in a modeled month, the positive difference is added to the portfolio. The table separates contributed principal from investment growth.

Opportunity-cost portfolio growth in the rent versus buy example
Year	Invested principal	Investment growth	Portfolio	Home equity
Year 1	$110,589	$6,565	$117,154	$93,721
Year 5	$131,682	$41,255	$172,937	$176,211
Year 10	$136,938	$102,958	$239,896	$299,256
Year 20	$136,938	$299,529	$436,467	$635,242
Year 30	$136,938	$657,168	$794,106	$1,152,950

How investment return changes the opportunity cost

A higher return increases the value of keeping the down payment and monthly savings invested. The final row comparison shows the long-term effect directly.

Opportunity-cost sensitivity by investment return
Investment return	Final renter portfolio	Final home equity	Final outcome
4%	$442,060	$1,152,950	Buying by $710,890
6%	$794,106	$1,152,950	Buying by $358,844
8%	$1,426,218	$1,152,950	Renting by $273,268

Use your holding period

Short stays expose buyers to closing and selling costs. Check whether any lead persists through your likely move date.

Use all-in ownership cost

Include interest, taxes, insurance, maintenance, HOA, and mortgage insurance when applicable.

Stress-test the result

Change rent growth, appreciation, investment return, and selling costs before making a decision.

Frequently asked questions

What is the opportunity cost of a home down payment?

It is the potential investment growth you give up when cash is used for a down payment and buying costs instead of remaining invested. A useful rent-versus-buy comparison models that alternative explicitly.

Should renters invest the down payment?

Investing the down payment is one possible renting strategy, not an automatic outcome. The comparison is useful only if the renter can actually invest the cash and maintain the assumed contribution and return over time.

Does the calculator invest the monthly difference too?

The model invests the positive monthly difference when the modeled renting cost is lower than the modeled buying cost. It does not assume negative savings can be invested.

Run this scenario with your numbers

Change the home price, rent, mortgage rate, maintenance, appreciation, and investment return to see how the result changes.

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