The leak, which has been picked up by the national media over the last two days, has left BBC chiefs furious about how the confidential details were made public.
A spokeswoman for the BBC confirmed that an investigation was taking place, adding: "We don't know where this information has come from -- we are looking into it. Obviously, it's not ideal to have your salary details splashed all over the place."
Details to emerge from the leak show that Radio 2's breakfast host Sir Terry Wogan has the highest salary, netting £800,000 for his five shows a week, with Radio 1 breakfast host Chris Moyles in second place with a £563,000 salary for his five shows a week.
However, in terms of pay per minute, Jonathan Ross has emerged as the richest, with his £530,000 salary working out at £60 a minute for his three-hour Saturday show.
Chris Evans is also reported to earn £540,000 a year to host Radio 2's drivetime show, according to the leak, which the BBC is refusing to confirm is accurate.
The leak comes at a bad time for the corporation, which is embroiled in a cost-cutting drive, with 3,700 jobs likely to be axed.
It is not just radio salaries that have been revealed. There was also a leak revealing that Jeremy Paxman allegedly earns over £1m a year, £800,000 for presenting 'Newsnight' and £240,000 for hosting 'University Challenge', which airs on BBC Two.
'University Challenge', the long-running university quiz show, airs 31 times a year.
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