Maryland Code, State Personnel and Pensions § 21-312

(a) To determine the earnable compensation of a member in a payroll period, the Board of Trustees may deem that the rate of annual compensation payable to the member on the first day of the payroll period continues throughout the payroll period.

(b) The Board of Trustees may omit member contributions for a period less than a full payroll period for an individual who was not a member on the first day of the payroll period.

(c) To facilitate the making of member contributions, the Board of Trustees may modify the member contribution required of any member by an amount not exceeding 0.1% of the annual earnable compensation on the basis of which the member contribution is to be made.

(e) If a member does not make the member contributions required by this Division II, on retirement, the member's retirement allowance shall be reduced by the actuarial equivalent of the missed accumulated contributions, including regular interest on those contributions at the statutory rate earned on member contributions in the member's system, compounded annually.