How the rules that once helped Americans buy their dream home could now leave them in debt

There’s no shortage of rules in real estate.But baked into these maxims are economic assumptions that no longer hold up in today’s market.“The core problem is the interaction of three things happening simultaneously,” explains Hannah Jones, senior economist at Realtor.com, pointing to high mortgage rates, slowing appreciation, and a whirlwind of rising carrying costs such as property taxes, insurance, and maintenance.That confluence is quietly turning the guidance that’s helped generations of homebuyers and owners navigate the market into a financial risk, says Benjamin Schieken, CEO of Fincast, a mortgage platform.“You can end up putting money in the wrong places, overpaying for your mortgage, or delaying homeownership longer than necessary,” he says.So, to see where the old math is breaking down, Realtor.com examined three of the most common rules: the five-year break-even timeline, the 20% down payment, and the 1% annual maintenance fund.We found that following these rules without adjusting them to a buyer’s finances, market, and home could mean taking up to 30 years to break even, spending 37.5 years saving for a down payment, or falling thousands of dollars short of the maintenance fund a home actually requires.The five-year rule could take 30 years to pay offHomebuyers are generally told to expect to live in a home for at least five years before they break even on their investment.

The rule rests on the long-running assumption that home values will appreciate at roughly 5% a year, close to the national median since 1987.But home prices have not moved at anything close to a steady pace in recent years.In 2021, national appreciation topped 17%, sharply shortening the time needed for owners to recoup their upfront costs.

By 2025, price growth had slowed to just over 2%.This year, it has slowed further.To test what that means for today’s buyers, Jones modeled transaction and carrying costs against current appreciation rates.“At tod...