How do you actually decide whether to rent or buy?

The comparison people make, monthly rent against a monthly mortgage payment, is the wrong one and reliably favors buying by hiding costs. The right comparison is unrecoverable costs on both sides. For renting, that is the entire rent. For owning, it is mortgage interest, property tax, homeowners insurance, HOA dues, maintenance, and the opportunity cost of the capital tied up in the down payment. Only the principal portion of a mortgage payment builds equity, and in the early years of an amortizing loan that portion is small. Maintenance is the line most consistently underestimated, with common planning figures running around one percent of the home's value annually, higher for older properties.

Transaction costs are what make the time horizon decisive. Buying costs several percent of the price in closing costs, and selling costs several percent more in commissions and fees, so a purchase must appreciate or save enough to overcome roughly eight to ten percent in round-trip friction before it comes out ahead. That is why the common break-even estimate lands around five years and stretches longer in expensive markets or flat ones. Buying with a realistic chance of moving within two or three years is usually a losing financial decision even in a rising market.

Two honest points on either side. Owning provides real advantages the arithmetic understates: a fixed mortgage payment while rents rise, forced savings through amortization, control over the space, and stability that has genuine value for families. And renting provides advantages that owners' advocates dismiss: liquidity, mobility for career opportunities, no exposure to a special assessment or a failed foundation, and the ability to invest the difference, which matters only if you actually invest it rather than spending it. The financial comparison is closer than the cultural conversation suggests, and the decision often turns correctly on how long you expect to stay and how much you value stability rather than on which one is a better investment.