About 50,000 of RBS-NatWest’s 65,000 staff have been told to continue working from home until at least the end of September.
The decision was revealed in a memo sent by RBS-NatWest CEO Alison Rose to employees.
About 400 workers who handle sensitive data have been asked to return to their offices in June.
About 10,000 RBS-NatWest staff have continued to work in offices and branches during the lockdown — many with reduced hours.
Roughly 95% of bank branches have remained open.
RBS-NatWest said strict distancing measures would be in place when staff return to offices.
“These include limits of two people per lift, thermal imaging and temperature checks at building entrances, and one-way corridors,” said the memo.
“Hot desking has been temporarily banned, and there will be at least one empty desk in between persons to ensure social distancing.”