GRP Rainer Lawyers and Tax Advisors in Cologne, Berlin, Bonn, Dusseldorf, Frankfurt, Hamburg, Munich, Stuttgart, Bremen, Hanover, Nuremberg, Essen and London www.grprainer.com/en conclude: The reference in the contract to the voluntary character and the withdrawal of special payments to the employee must be expressed unambiguously in the general working conditions. Otherwise, the employer’s rights for changes of these payments will not be available. These will require a precise definition of the shares of the additional payments that are bound by the voluntary condition, as well as the shares under the revocation.