The government pay scheme for workers who are kept on the payroll, despite not working due to coronavirus, is set to open for applications on Monday.
Under the Coronavirus Job Retention Scheme, the government will cover 80% of workers’ wages, up to £2,500 a month, if they are put on leave.
Chancellor Rishi Sunak said: “It’s vital that our economy gets up and running again as soon as it’s safe.”
Millions of workers are expected to be “furloughed” because of the lockdown.
The Treasury said the system, which goes live at 08:00 on Monday, can process up to 450,000 applications an hour. Employers should receive the money within six working days of making an application, it said.
On Friday, Mr Sunak announced that the wage subsidy scheme would be extended by a further month, until the end of June.
The move came after the government confirmed that lockdown restrictions in the UK would continue for “at least” another three weeks.
Adam Marshall, director general of the British Chambers of Commerce, said: “With April’s payday approaching, it is essential that the application process is smooth and that payments are made as soon as possible.
“Any delay would exacerbate the cash crisis many companies are facing and could threaten jobs and businesses,” he added.
Under the Coronavirus Job Retention Scheme, the government will cover 80% of workers’ wages, up to a maximum of £2,500 per worker, per month before tax.
Bosses will pay workers and reclaim the money from HM Revenue and Customs (HMRC) online after the service goes live on 20 April.
The minimum amount of time that an employee can be furloughed is three weeks, and firms are not expected to start receiving money until at least the end of April.
According to new research by the Resolution Foundation, the take-up of the scheme has been higher than initially anticipated.
It estimates that eight million workers could be furloughed over the coming weeks.
It found that those working in low-paid sectors – such as hospitality or retail – are worst-affected, with almost half of the workforce expected to be put on paid leave.
Daniel Tomlinson, economist at the Resolution Foundation, said: “The government’s welcome Job Retention Scheme is what stands between Britain experiencing high unemployment over the coming months, and catastrophic depression-era levels of long-term joblessness.
“It is proving particularly essential in big, low-paying sectors like hospitality and retail, where around half the workforce are no longer working.”
High Street chains such as Oasis and Warehouse, as well as fast food firms KFC and McDonald’s, have all furloughed staff as their work has come to a standstill under lockdown.
Rain Newton-Smith, chief economist at the Confederation for British Industry, welcomed the launch of the online application service for firms.
“Rolling out the job retention scheme will make a huge difference to tens of thousands of firms and millions of people, protecting jobs and living standards throughout the UK,” she said.
“Ensuring support gets to where it’s needed most – fast – is of the utmost importance.”