The buyout is one of many approaches Trump is taking to slash a civilian workforce of 2.3 million that he has blasted as ineffective and biased against him.
He has also ordered government agencies to prepare for wide-ranging job cuts, and several have already begun to lay off recent hires who lack full job security.
Officials have been told to prepare staff cuts of up to 70% at some agencies, sources say.
Unions had urged their members not to accept the buyout and have warned that Trump cannot be trusted to honor it.
Musk aides lock govt workers out of computer systems at US agency
The offer promises to pay employees their regular salaries and benefits until October without requiring them to work, but that may not be ironclad.
Current spending laws expire on March 14, and there is no guarantee that salaries will be funded beyond that point.
Trump has deputized billionaire Elon Musk to head the newly created Department of Government Efficiency, which is combing through payment and personnel records to cut $1 trillion from the federal budget, which totaled $6.75 trillion last year. Civilian worker’s salaries account for less than 5% of that total.

Mutib Khalid is a skilled content writer and digital marketer with a knack for crafting compelling narratives and optimizing digital strategies. Excel in creating engaging content that drives results and enhances online presence. Passionate about blending creativity with data-driven approaches, Mutib Khalid helps brands connect with their audience and achieve their goals.