It is the latest twist in the gravity-defying world of the high housing prices and exotic low-rate mortgages: As monthly payments on adjustable-rate mortgages are starting to balloon, many Americans have found a way to put off the day of reckoning.

Betting Everything on the House

They are refinancing with new adjustable-rate mortgages that keep monthly payments low — for now, that is, though their payments will likely rise even higher in the future.

“Some people would say I am a little crazy,” acknowledged R. Lance Perry, 42, of Danville, Calif., one of the new breed of people refinancing their mortgages. But faced with a sharp increase in his monthly payments and a need to take cash out of his home, he refinanced earlier this year to keep his payments the same.

By the time the rate goes up, he figures, his income will have increased enough to cover the higher payments, he will have refinanced again or he will have moved.

Like Mr. Perry, millions of Americans have turned to adjustable-rate mortgages, or A.R.M.’s, in recent years to afford a home as prices soared.

Typically set at artificially low rates in the first years of the loan, these mortgages are then reset at the prevailing interest rates. For borrowers, the bet was that interest rates would remain low.

Now, the first big wave of the mortgage boom is cresting as more than $400 billion worth of adjustable-rate mortgages, or about 5 percent of all outstanding mortgage debt, will readjust this year for the first time, according to Loan Performance, a research firm. Next year, another $1 trillion in loans will readjust.

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