The chancellor is set to announce an employment and wage subsidy package to try to protect millions of jobs.
Talks went on into the night with business groups and union leaders, who urged the government to help pay wages amid the coronavirus pandemic.
Many firms are warning of collapse, wiping out thousands of jobs, as life in the UK is largely put on hold.
It is the latest in a string of big fiscal attempts to ease the burden on businesses and their employees.
Prime Minister Boris Johnson signalled Chancellor Rishi Sunak would be saying more on Friday about the extended package the government is putting forward for workers.
The PM has urged struggling businesses to “stick by their employees, because we’re all going to need them”.
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One proposal under discussion is for the UK to follow the lead of countries such as Denmark, where the government has promised to cover 75% of salaries at private companies for three months, if they promise not to let staff go.