Rent vs. Buy: How to Actually Decide

Last updated: September 2026 · Written by Hugo Cardozo

The comparison most people get wrong

The instinctive comparison is "is my mortgage payment bigger or smaller than my rent?" That misses two things: a mortgage payment partly builds equity (an asset), while rent builds nothing — but a renter also isn't tying up a down payment and closing costs, money that could be invested elsewhere and grow on its own.

Think in final net worth, not monthly cost

The more complete question is: after N years, which path leaves you with more net worth? For the buyer, that's home equity — the appreciated home value minus whatever's left on the mortgage. For the renter, that's whatever they invested (the down payment, closing costs, and any month their rent was cheaper than the buyer's total housing cost) grown at an assumed investment return.

What tends to favor buying

Longer time horizons, strong home price appreciation, high rent growth relative to mortgage costs, and low turnover (since selling costs like realtor commissions eat into a short-term buyer's equity) all tend to favor buying.

What tends to favor renting and investing

Shorter time horizons, high assumed investment returns relative to home appreciation, and expensive housing markets with a stretched price-to-rent ratio tend to favor renting and investing the difference.

There's no universal right answer

This decision is genuinely sensitive to assumptions nobody can know in advance — future home appreciation, future investment returns, how long you'll actually stay. Run a few different scenarios in the calculator rather than trusting a single result, and weigh the non-financial factors (stability, flexibility to move, control over your space) that no calculator can price in.

Frequently asked questions

How long do I need to stay in a home for buying to make sense?

There's no fixed number, but a commonly cited rough guideline is 5+ years, since closing costs and realtor commissions on a sale (often 6-8% of the price) need time to be offset by equity growth and the rent you'd otherwise have paid.

Does a bigger down payment always make buying the better choice?

Not necessarily — a bigger down payment lowers monthly costs and total mortgage interest, but it also ties up more money that could have been invested elsewhere. It changes the comparison, but doesn't automatically tip it toward buying.

What's the biggest mistake people make in this comparison?

Comparing rent directly to a mortgage payment and stopping there. That ignores maintenance, property tax, insurance, and selling costs on the buying side, and ignores the investment growth on a renter's unused down payment — both sides need the fuller picture.