Washington: The White House and Senate leaders struck a bipartisan deal on Monday to try to avoid a "fiscal cliff" budget crisis, although the agreement was likely to face stiff challenges in the House of Representatives.
Senators were due to vote on the accord before midnight (0500 GMT Tuesday) and independent Senator Joe Lieberman said it had strong support from the Democrats who control the chamber.
The agreement still came too late for Congress to meet its own deadline of New Year's Eve to pass laws halting $600 billion in tax hikes and spending cuts due to come into force on January 1.
But with Tuesday a holiday, Congress still had time to draw up legislation, approve it and backdate it to avoid the harsh fiscal measures coming into force.
That will need the backing of the House where many of the Republicans who control the chamber complain that President Barack Obama has shown little interest in cutting government spending to try to reduce the US budget deficit.
House Republicans are also likely to balk at planned tax hikes on household incomes over $450,000 a year that was part of the agreement struck between Vice President Joe Biden and Senate Republican Minority Leader Mitch McConnell. The House has convened a session for Tuesday at noon (1700 GMT).
The deal would make permanent the alternative minimum tax "patch" that was set to expire, protecting middle-income Americans from being taxed as if they were rich.
Indiscriminate spending cuts for defence and non-defence spending were simply postponed for two months.
As New Year's Day approached, members were thankful that financial markets were closed, giving them a second chance to return on Tuesday to try to blunt the worst effects of the fiscal mess.
There is no major difference whether a law is passed on Monday night, Tuesday or Wednesday. Legislation can be backdated to January 1, for instance, said law firm K&L Gates partner Mary Burke Baker, who spent decades at the Internal Revenue Service.
"This is sort of like twins and one being born before midnight and one being born after. I think the date that matters is the day president signs the legislation," she said.
© Thomson Reuters 2013