Comfortably affording the typical home purchase in the U.S. now takes close to $99,800 a year in household income, according to Zillow’s July housing data. That’s the income needed to cover a mortgage payment on a typical home without spending more than 30% of earnings on housing, the standard affordability threshold lenders and researchers generally use.
The number matters because it sits well above what a typical American household actually earns. The Census Bureau’s most recent measure of real median household income put the figure at $83,730, which means the gap between what it takes to comfortably buy a typical home and what a typical household brings home is now roughly $16,000 a year, before counting a down payment at all.
$99,800 to buy, $78,488 to rent, a $21,000 gap
Zillow’s own comparison puts the income needed to comfortably afford a typical rental at $78,488, versus nearly $99,800 for a typical home purchase, a gap of more than $21,000 that the company says has widened significantly as both home prices and mortgage rates climbed over the past several years. Renting a typical unit currently consumes about 26.8% of a household’s income nationally, under the 30% cost-burden threshold, while buying a typical home pushes well past it for a household earning the median income.
That $21,000 gap is the plainest way to see why so many households who could technically qualify for a mortgage are choosing, or being forced, to stay renters. It isn’t just a down payment problem; it’s a monthly cash-flow problem that persists for as long as mortgage rates stay elevated.
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Why mortgage rates are doing most of the damage
The affordability math is driven less by home prices themselves than by the cost of borrowing against them. Freddie Mac’s weekly mortgage rate survey put the 30-year fixed rate at 6.71% as of early September, holding in the same mid-6% range Zillow cited when it published its July report. A rate near 6.5% to 6.7% roughly doubles the monthly interest cost on a mortgage compared with the sub-4% rates common just a few years ago, and that difference falls entirely on the buyer’s monthly payment rather than the home’s sale price.
A household that could have afforded a given home at a 4% rate may need tens of thousands of dollars more in annual income to afford the identical home at 6.7%, even if the purchase price hasn’t moved at all. That’s the mechanism behind the $99,800 figure, and it’s also why the number moves up and down with mortgage rates more than with any single month’s home-price trend.
How the 30% rule turns into a dollar figure
The $99,800 threshold comes from a simple calculation applied to the typical U.S. home: take the estimated monthly mortgage payment, including principal, interest, taxes and insurance at prevailing rates, multiply it by 12, and divide by 0.30. A household spending exactly 30% of its income on housing at the median mortgage payment lands almost exactly at that income level. Spend more than 30%, and a household is considered cost-burdened by the standard measure researchers and lenders use, a threshold that has guided housing policy discussions for decades and shows up in everything from mortgage underwriting to federal housing assistance eligibility.
Applied to renting instead of buying, the same 30% math produces the lower $78,488 figure, because a typical rent payment is smaller than a typical mortgage payment on an equivalent home once property taxes, insurance and a larger loan balance are factored in.
What this means next to the rental market
The size of the gap between renting and buying helps explain another trend in the same Zillow data: rental demand staying strong even as rents themselves pick up speed. A household priced out of the $99,800 income threshold for buying doesn’t disappear from the housing market; it stays in the rental pool, competing for the same apartments and houses as everyone else who isn’t ready to buy. That extra demand is part of what’s pushing rents higher even in a market where new apartment supply is still historically elevated.
For a household actually running these numbers, the practical question isn’t just “can I afford the mortgage payment” in isolation, but how that payment compares with what the same household would otherwise spend renting. At a $21,000 income gap between the two, renting remains the mathematically cheaper option for a large share of households, even before accounting for the cash a down payment ties up.
Where the income threshold could move from here
The $99,800 figure isn’t fixed. It moves with home prices, with mortgage rates, and with the 30%-of-income affordability standard itself. Mortgage rates easing meaningfully below 6.5% would lower the income threshold without home prices moving at all, while home prices continuing to climb in tight markets would push it higher even if rates hold steady. Until one of those two levers shifts, the gap between what it takes to rent and what it takes to buy is likely to stay close to where it sits now.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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