Banks and other lenders would have to reduce the payments to no more than 31 percent of a borrower’s income, which would typically be the amount of unemployment insurance, for three to six months. In some cases, administration officials said, a lender could allow a borrower to skip payments altogether.

The new push, which the White House is scheduled to announce Friday, takes direct aim at the major cause of the current wave of foreclosures: the spike in unemployment. While the initial mortgage crisis that erupted three years ago resulted from millions of risky home loans that went bad, more-recent defaults reflect the country’s economic downturn and the inability of jobless borrowers to keep paying.

The administration’s new push also seeks to more aggressively help borrowers who owe more on their mortgages than their properties are worth, offering financial incentives for the first time to lenders to cut the loan balances of such distressed homeowners. Those who are still current on their mortgages could get the chance to refinance on better terms into loans backed by the Federal Housing Administration.

The problem of “underwater” borrowers has bedeviled earlier administration efforts to address the mortgage crisis as home prices plunged.

Officials said the new initiatives will take effect over the next six months and be funded out of $50 billion previously allocated for foreclosure relief in the emergency bailout program for the financial system. No new taxpayer funds will be needed, the officials said.

The measures have been in the works for weeks, but President Obama is finally to release the details days after his watershed victory on health-care legislation. Following that bruising battle on Capitol Hill, his administration is now welcoming a chance to change the subject and turn its attention to the economy and, in particular, the plight of the unemployed — concerns that are paramount for many Americans.