In a transition economy, many of employee/employer's contracts are informal, rather than formal. Even in cases when formal contracts concluded, external legal enforcement of a contract often appears to be imperfect and costly. Sometimes, this brings to the employer the opportunity to 'deceive' the employee, paying him a lower salary than he had expected ex-ante. Underdevelopment of the judiciary system and weak enforcement of courts decisions make this problem more serious, and at the same time more difficult to resolve. The current paper provides a positive model of deception at labor markets.