The motoring body has awarded a deal worth £3 million to Whitechapel, part of Lloyds TSB autolease, which will provide the scheme to RMI's UK fleet.
Whitechapel will supply 190 vehicles under a three-year contract and RMI employees currently running a company car will be able to downgrade vehicles and benefit from the cash difference.
Kevin Waterman, finance director at the RMI, said: 'Our drivers were heavily penalised under the 2002 changes to benefit in kind and CO2 emissions taxes.
'Whitechapel's car ownership scheme offers our drivers increased vehicle budget flexibility while protecting their net pay against escalating taxes. Whitechapel was able to refinance the vehicles supplied through our previous leasing arrangement.
'This enabled us to reset maintenance budgets and residual values on used cars which provided us with significant financial savings.'