New rules at FHA could change the way first time home buyers in Boise Idaho purchase homes.

David Stevens bought his first home almost 25 years ago, paying just 3% down with a loan backed by the Federal Housing Administration. “I had no money in the bank,” he says. “If it weren’t for the FHA, I wouldn’t have gotten that home.”

Now, as FHA commissioner, Mr. Stevens has to decide how many others to let through that door. Souring FHA-insured mortgages are threatening the agency’s finances. Congress is pressuring him to tighten the easy-money standards that once helped people like him, and he is expected to announce revisions as early as this week.

But raising the credit bar could have a dangerous side effect. In many of the nation’s hardest-hit housing markets, the FHA backs around half of all new home loans. If the agency pulls back too quickly, the nascent housing recovery could fizzle, endangering the economy.

The dilemma puts the 52-year-old former mortgage banker squarely in the middle of the debate over how much the government should do to prop up the housing market, and how much risk taxpayers should take on to do it.

“How big a role do we need to play to keep the housing system functioning?” says Mr. Stevens, referring to the FHA. “Overcorrecting in either direction would be a terrible thing to do right now.”

Mr. Stevens is finalizing possible revisions to credit standards. Options include raising the minimum down payment, establishing a minimum credit score, increasing the amount that borrowers have to pay for mortgage insurance, and reducing the amount of money sellers can kick in for closing costs.

The FHA, created in 1934 to heal the U.S. housing market during the Great Depression, traditionally has helped first-time home buyers and underserved segments of the market. It doesn’t lend money to home buyers, but insures lenders against default on loans that meet FHA criteria, collecting fees for that backing. For decades, thanks to a stable housing market, it turned a profit for taxpayers.

When the housing market was booming, subprime lenders drew away many of the borrowers who traditionally used FHA-backed loans by offering even more favorable terms. Unlike the FHA, subprime lenders didn’t require borrowers to document their incomes. The FHA saw its share of the mortgage market fall to 2% in 2006.

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