The emerging agreement would deliver more than US$300b in aid to businesses and provide the jobless a US$300-per-week bonus federal unemployment benefit and renewal of state benefits that would otherwise expire right after Christmas. It also includes vaccine distribution funds and money for renters, schools, the Postal Service and people needing food aid.
Some parts of the bill are being fiercely contested, however, with direct payments to individuals a key sticking point. Democrats have sought another round of US$1200 direct payments but Republican Senator Ron Johnson blocked the move, keeping the proposed direct payment amount at US$600.
Democrats on Friday came out swinging at another key obstacle in the bill: a provision by conservative Senator Pat Toomey that would close down Federal Reserve lending powers. Toomey's provision bars the Fed from restarting lending programmes next year, and Democrats say such a law would tie Biden's hands and put the economy at risk.
"As we navigate through an unprecedented economic crisis, it is in the interests of the American people to maintain the Fed's ability to respond quickly and forcefully," said Biden economic adviser Brian Deese.
"Undermining that authority could mean less lending to Main Street businesses, higher unemployment and greater economic pain across the nation."
For Republicans, the most important provision was a long-sought second round of "paycheque protection" payments to especially hard-hit businesses and renewal of soon-to-expire state jobless benefits for the long-term unemployed.
Biden is promising an additional stimulus bill next year, but if Democrats lose Georgia Senate runoff elections next month and fail to win the Senate majority, they may have little leverage.
Most economists, including Federal Reserve Board chairman Jerome Powell, strongly support additional economic stimulus as necessary to keep businesses and households afloat through what is widely anticipated to be a tough winter.
Many forecast the economy could shrink in the first three months of 2021 without more help. Standard & Poor's said in a report Tuesday that the economy would be 1.5 percentage points smaller in 2021 without more aid.