The Department for Work and Pensions is set to embark on a swingeing round of job cuts, according to the Financial Times, with more than a third of staff set to exit.
The FT reports that officials are planning to axe as many as 30,000 staff over the next five years as part of a new round of cuts if a Conservative government is elected.
A Labour led-Government would reportedly seek to cut 20,000 roles.
The FT estimates the DWP currently employs a full-time workforce of 83,000.
The report comes months after George Osborne pledged to make £10bn in savings from Whitehall by 2017-18, with a further £5bn-£10bn targeted by 2020.
A Cabinet Office spokesman says: “Decisions on spending reductions by department have not yet been taken. This will form part of the next Spending Round in the next Parliament.”