BBC Three, which is aimed at young audiences and launched hits such as Fleabag and Gavin & Stacey, previously moved online in 2016, but was reinstated as a TV channel in 2022.
BBC Scotland launched as a channel in 2019, broadcasting a variety of Scottish programming including news, sport, documentaries and entertainment.
However, some of the shows that air on the two networks, such as Two Doors Down on BBC Scotland and Sort Your Life Out on BBC Three, are repeats of episodes originally broadcast on other more mainstream BBC channels.
Both networks currently only broadcast TV programming in the evenings, although BBC Scotland simulcasts BBC Radio Scotland during the rest of the day.
The BBC said that the network’s nightly programme Reporting Scotland: News at Seven will not move to BBC iPlayer and will cease when the linear channel closes.
Audiences will continue to be served by BBC Scotland’s wider news offering, including Reporting Scotland, The Sunday Show, Radio Scotland Breakfast, Debate Night and Scotscast, the corporation said.
While Radio 4 Extra does air some original programming, its schedule is predominantly made up of archive content, much of which is available on BBC Sounds.
Affected staff were told about the changes on Tuesday, although the proposed closure of BBC Scotland and BBC Three had been reported by some media outlets in recent weeks.
The BBC is aiming to cut between 1,800 and 2,000 jobs – almost one in 10 – in an attempt to save £500m over two years as it faces “significant financial pressures”.
On Tuesday, the corporation also confirmed more job closures in the news division, with more details from the department’s newly appointed director Rachel Jupp expected to follow later.
Around 550 job closures have already been announced in news, while more than 30 job cuts have so far been announced for BBC Sport.
Meanwhile, several high-profile BBC TV series have been cancelled altogether in recent weeks.
RuPaul’s Drag Race UK, Blankety Blank, Celebrity Mastermind, Live at the Apollo, Football Focus and Ski Sunday are among the programmes the BBC has dropped so far, while other formats such as DIY SOS have been temporarily rested.