The Guardian newspaper is to cut running costs by 20% over three years and may begin charging for some online content following a 25% plunge in print advertising, UK media reported today. 

The Times said Guardian staff were expecting 100 jobs to be cut, although The Daily Telegraph said any layoffs would be announced in March. 

Executives from Guardian News and Media, the newspaper's publishers, told staff at a meeting yesterday that the group would be cutting around £54m in costs. 

Operating losses in the year to March 2015 were expected to be £53m, the executives said, adding that the aim was to break even in three years. 

Reserves in the investment fund which supports The Guardian dropped to £735m from £838.3m over the same 12-month period, they said. 

"Growing the cost base more than revenue is simply not sustainable," chief executive David Pemsel was quoted as saying at the meeting.

Mr Pemsel said that the newspaper could even consider moving out of its offices near King's Cross station in London although nothing had been decided. 

The executives declined to comment on potential cuts to The Guardian's 1,960 staff. 

Pemsel ruled out introducing a paywall for The Guardian's website and mobile apps but indicated that one option would be to make some content available for paying members only.