Flat Benefit Formula A method of calculating an employer's contribution to an employee's defined benefit plan whereby the employer multiplies an employee's months of service by a predetermined flat monthly rate. Investopedia Says: There are three basic types of defined benefit plans: the flat benefit, unit benefit and variable benefit. Related Terms: 401K Plan Cash Balance Pension Plan Defined Benefit Plan IRA Pension Plan Pension Shortfall RRSP Superannuation Target Benefit Plan |