Rent Vs Buy The 5 Percent Rule

Rent vs. Buy: The 5% Rule (Ben Felix Style)

The cultural narrative around homeownership is nearly unassailable. Buying a home is framed as the responsible adult choice, a wealth-building milestone, the transition from throwing money away on rent to building equity. The emotional weight of this framing is substantial—and it leads people to buy homes that are financially disadvantageous compared to renting, without realizing it.

The rent vs. buy decision is genuinely complex. It depends on local market conditions, how long you'll stay, your tax situation, and factors that are difficult to predict. But there is a framework—popularized by financial planner and YouTuber Ben Felix, drawing on academic work by economists including Shiller, Case, and Sinai—that cuts through the complexity and produces a clear comparison in most situations. It is called the 5% rule.

THE COST OF OWNING THAT RENTING DOESN'T HAVE

The conventional comparison—mortgage payment vs. rent payment—is incomplete because it ignores the costs of ownership that have no equivalent in renting.

When you own a home, you incur three categories of unrecoverable costs—money spent that doesn't build equity and isn't recovered when you sell:

Property tax: Typically 0.5% to 2.5% of the home's value annually, depending on location. On a $500,000 home, this is $2,500 to $12,500 per year.

Maintenance and repair: The widely cited estimate is 1% of home value per year on average, though this varies significantly by home age and condition. On a $500,000 home, that's $5,000 per year in expected maintenance—a leaky roof, an HVAC replacement, a water heater, appliance repairs, exterior upkeep.

Cost of capital: This is the least intuitive component. The money used as a down payment has an opportunity cost—if you hadn't put $100,000 into a home, you could have invested it and earned a return. Additionally, the portion of the home you own outright (your equity) is capital that could be deployed elsewhere. Using a long-term equity return of approximately 7% nominal as the opportunity cost is standard in this analysis.

THE 5% RULE

Ben Felix's version of this framework estimates that the total unrecoverable cost of owning a home is approximately 5% of the home's value per year—encompassing all three categories above. The specific percentages he uses are approximately 1% for property tax (a rough national average), 1% for maintenance, and 3% for cost of capital.

To apply the rule: multiply the home's purchase price by 5%, then divide by 12 to get a monthly unrecoverable cost.

$400,000 home: 5% = $20,000/year = $1,667/month

$600,000 home: 5% = $30,000/year = $2,500/month $800,000 home: 5% = $40,000/year = $3,333/month

If you can rent a comparable home for less than this monthly amount, renting is financially superior—even accounting for equity building through mortgage paydown. If renting costs more than this amount, buying may be the better financial choice.

This rule does not say renting is always better. It says: calculate the actual comparison, including costs that are typically ignored.

WHY EQUITY BUILDING DOESN'T CHANGE THE ANSWER AS MUCH AS EXPECTED

The primary counterargument to rent-favoring analyses is equity accumulation: when you pay a mortgage, you build ownership. When you pay rent, you don't. This is true. It does not mean buying is always better.

Equity builds through two mechanisms: mortgage principal paydown and home price appreciation. Both are real but both are often overstated.

On mortgage paydown: In the early years of a mortgage, the vast majority of each payment is interest, not principal. On a $400,000 mortgage at 7% interest, the first monthly payment is approximately $2,661. Of that, roughly $2,333 is interest and $328 is principal. The equity you build in year one through paydown is modest. By year 10, the split is more favorable—but so is the rental alternative, which has grown with investment returns over the same period.

On home price appreciation: The commonly cited statistic is that home values double every 20 years or so. But this is nominal appreciation, before inflation. Robert Shiller's long-run research on U.S. real home prices shows that inflation-adjusted appreciation has been roughly 0% to 1% per year over very long historical periods. Periods of strong appreciation—the 2000s, the 2010s, and especially the post-pandemic boom—create survivorship bias in the popular narrative.

This does not mean homes don't appreciate. It means that inflation-adjusted returns on residential real estate, once costs are accounted for, are modest compared to diversified equity investing over equivalent periods.

WHERE THE 5% RULE UNDERSTATES BUYING'S ADVANTAGE

The 5% rule is a useful heuristic, not a precise calculator. Several factors can make buying more attractive than the rule suggests:

High local property appreciation: In cities where real home price appreciation has genuinely exceeded inflation by 2% to 3% per year over decades—San Francisco, Seattle, New York—the rule underestimates buying's upside. Local market research matters.

Mortgage interest deduction: The tax deductibility of mortgage interest reduces the effective cost of a mortgage for itemizing taxpayers. After the 2017 Tax Cuts and Jobs Act raised the standard deduction, fewer homeowners itemize—but those with large mortgages and high state taxes still may benefit.

Fixed housing costs during inflation: A fixed-rate mortgage's principal and interest payment doesn't change over 30 years. Rents typically increase with inflation. In high-inflation environments, a homeowner's relative cost position improves over time as rents rise while mortgage payments stay flat.

Forced savings behavior: For people who would otherwise not invest the difference between a mortgage payment and a lower rent, the equity-building of homeownership—however modest—may outperform the alternative of higher spending. The 5% rule assumes the renter invests the difference, which is a behavioral assumption that doesn't always hold.

WHERE BUYING'S ADVANTAGE IS WEAKEST

Transaction costs are the most underappreciated constraint on homeownership returns. Buying costs 2% to 5% of the purchase price in closing costs. Selling costs another 5% to 7% in agent commissions and fees. Round-trip transaction costs of 7% to 12% mean that a home must appreciate significantly before break-even—purely on transaction costs—relative to renting and investing.

At 5% annual appreciation (high by historical standards), it takes approximately 2 to 3 years of ownership to cover transaction costs. At more modest appreciation, the break-even extends to 5 to 7 years. Academic research on this point—including work by Sinai and Souleles (2005) published in the Review of Economic Studies—finds that time horizon is the most important variable in the rent vs. buy decision.

The practical implication: If you expect to move within 3 to 5 years, renting almost certainly wins on a purely financial basis. If you plan to stay 10 or more years, buying in a market where the 5% rule is close to satisfied becomes increasingly defensible.

THE QUESTION THE MATH CAN'T ANSWER

The 5% rule addresses financial efficiency. It does not address the non-financial dimensions of homeownership: stability, customization, community roots, the ability to have pets or paint the walls, the psychological security of owning your space. These are real and meaningful.

The right framing is not "is buying always better?" or "is renting always smarter?" It is: "Do I understand what this home actually costs, and am I choosing it with clear eyes?" The 5% rule provides the financial clarity that makes that choice informed rather than reflexive.

For first-time buyers comparing a $3,200 mortgage payment to a $2,400 monthly rent, the question is not just which is lower. It's whether the full cost of owning—taxes, maintenance, opportunity cost—justifies the premium. The 5% rule makes that total visible.