What home buyers need to know about soaring mortgage rates

A for sale sign stands outside a single-family residence on the market Sunday, June 18, 2023, in Denver. On Thursday, the National Association of Realtors reports on sales of existing homes in May. (AP Photo/David Zalubowski) · Washington Post · ASSOCIATED PRESS

It's getting even harder to buy a home.

The average mortgage rate recently hit a 21-year record of 7.09 percent, according to Freddie Mac, significantly increasing the cost of acquiring a home for all but the most cash-rich buyers. That's more than double the rate of a few years ago.

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Here's what to know about rising mortgage rates and the effect on home buyers.

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Why are mortgage rates so high?

Mortgages have become more expensive because of the Federal Reserve's campaign to get inflation under control.

The U.S. central bank has repeatedly raised the federal funds rate - the interest rate at which banks lend each other money - to increase borrowing costs for everyday people and businesses. More expensive debt, the reasoning goes, means less spending and that should gradually slow the rise in prices.

To a large extent, it has worked: The annual rate of inflation stood at 3.2 percent in July, far lower than last summer's peak of 9.1 percent.

Mortgage rates tend to move in the same direction as the federal funds rate, although lenders' efforts to manage risk and expectations for future inflation also play a role.

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How does this impact affordability?

Individuals buying houses typically get mortgages, which are loans for the purchase of a home. Home mortgages usually have terms that last 10 to 30 years.

Because mortgages cover such a massively expensive purchase over a loan period that can span a generation, even small differences in the interest rate can make a huge difference in what the homeowner has to pay every month.

Let's say a home is being bought for $250,000 with a 20 percent down payment. Holding all else equal, the difference in monthly payment from a 3 percent interest rate and a 7 percent rate comes out to more than $500 a month, according to a Washington Post mortgage calculator.

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Has this happened before?

Joe Gyourko, who studies the housing market at University of Pennsylvania's Wharton School of Business, recalls when he and his wife bought a house in the early 1990s. Then, as today, the typical mortgage rate was close to 7 percent.

But housing prices have risen precipitously since then, and most people's incomes have not kept up.

"It's easy for an old-timer like me to say, 'Ah, I remember rates like these,'" Gyourko said. "But prices were lower relative to income than they are today, particularly in the coastal markets."

Rates could be even worse, one analyst said. Mortgage rates climbed throughout the 1970s and reached more than 18 percent in the early '80s before declining.