Others employing staff part-time will receive much more limited support for their wage bills.
Sunak is expected to unveil additional measures to help struggling firms with one possibility being to extend the eligibility for business grants, The Guardian reported on Wednesday. The Financial Times said there would be more support for the hospitality sector.
The government has clashed with regional politicians in northwest England over the scale of aid available to businesses and workers.
Many lockdown measures in Britain do not require businesses to close outright but significantly restrict trade, for example by barring pubs and restaurants from serving groups of people who do not live in the same household, or opening after 10 p.m.