The money is set to accompany a bigger $1.4tn spending bill to fund government operations over the next nine months.
It comes as many Covid-19 economic relief programmes were set to expire at the end of the month.
About 12 million Americans were at risk of losing access to unemployment benefits.
The House of Representatives and the Senate are expected to vote on the package on Monday. Officials say it should have enough support to quickly pass both chambers.
The new package will include $600 direct stimulus payments to most Americans, and boost unemployment payments by $300 per week. It is also set to include more than $300bn in support for businesses, and money for vaccine distribution, schools and renters facing eviction.
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The deal was announced on Sunday by Senate majority leader Mitch McConnell.
“We can finally report what our nation has needed to hear for a very long time: More help is on the way,” he said. The package, he added, contained “targeted policies to help struggling Americans who have already waited too long.”
Top Democrats Nancy Pelosi and Chuck Schumer said the package “delivers urgently needed funds to save the lives and livelihoods of the American people as the virus accelerates”.
The bill does not include substantial aid to local governments, which had been a top priority for many Democrats.
US Senate Democratic leader Mr Schumer said the package did help local governments indirectly by providing money for schools, Covid-19 testing and other expenses.
He said the package would “establish a floor, not a ceiling, for coronavirus relief in 2021”, and that Democrats would push for more aid after President-elect Joe Biden takes office next month.
Congress was expected to pass the bill by Friday, but negotiations continued through the weekend.
The delays led to concerns over whether the government would shutdown without a spending bill. Washington has been operating on temporary funding since October, the start of the federal government’s financial year.
The US in March approved more than $2.4tn in economic relief, including $1,200 stimulus cheques, funds for businesses and money to boost weekly unemployment payments by $600.
The package was credited with cushioning the economic hit of the pandemic, which cast more than 20 million Americans out of work this spring and drove the unemployment rate up to 14.7% in April.
The US has regained about half of the jobs lost, but economists and businesses have been pushing Congress to approve further economic relief, as programmes expired and money ran out, prompting recovery to slow.
A survey by the Chamber of Commerce released on Tuesday found three quarters of small businesses said they needed gov5ernment help to survive.
In the last five months, the US poverty rate has spiked, reaching 11.7% last month – an increase of 2.4 percentage points since June, according to research from the University of Chicago and University of Notre Dame.
Nearly eight million more Americans are now living in poverty. This year has seen the biggest single year increase since poverty tracking began 60 years ago.
Many low-income Americans have seen their bank balances drop steadily in the months since April, when the first government stimulus checks arrived. Without further assistance, lower-income families’ checking account balances will drop faster than higher-income households, a report by the JPMorgan Chase Institute found.
Related Topics Nancy Pelosi Coronavirus pandemic US economy Mitch McConnell US politics
- Covid: US reaches long awaited deal for coronavirus aid [https://www.bbc.co.uk/news/business-55324489]