Minn. Stat. § 354.51
Subd. 1. Eligibility to make payments.
MEMBER DEDUCTIONS.
No member shall be entitled to make payments in lieu of salary deductions to the retirement board to receive credit for any period of service prior to that date for which employee contributions were not deducted from the member's salary, except as provided in subdivision 4, or section 354.50 or 354.53.
Subd. 2.
[Repealed, 1974 c 289 s 59]
Subd. 3.
[Repealed, 1974 c 289 s 59]
Subd. 4. Other state or school teaching service; purchase of credit.
Any teacher who has rendered teaching service prior to June 30, 1953, in another state, or in a state public school which is not an employing unit with employees for whom retirement coverage is provided pursuant to this chapter, or for the University of Minnesota, who was a member of the fund prior to or after the uncredited teaching service, who is not entitled to any benefits from any other retirement system based on the uncredited teaching service, who has credit for at least 15 years of service as a member of the retirement fund with at least five years of service occurring subsequent to the period of uncredited teaching service, who became a member of the retirement fund prior to June 30, 1957, and who has not accepted a refund of accumulated member contributions or deductions and resumed teaching service covered by the retirement fund after July 1, 1957, shall be entitled to obtain service credit for the period of uncredited teaching service. To obtain service credit, a teacher shall make a payment equal to six percent of the average annual salary of the teacher for the five year period occurring immediately prior to the completion of the minimum service requirement or July 1, 1951, whichever is later, multiplied for the number of years of the period of uncredited teaching service, but not to exceed $175 annually for any period of uncredited teaching service occurring prior to July 1, 1953, or $216 annually for any period of uncredited teaching service occurring subsequent to June 30, 1953. The payment made by the teacher shall be accompanied by a matching payment representing the employer contribution. This matching employer contribution payment is to be made by the agency which formerly employed the teacher, except that, at its discretion, the payment may be made by the current employer of the teacher. The payments shall include interest at an annual rate of 8.5 percent compounded annually from the end of the year of uncredited service to the date on which payment is first made. Payment shall be made in a single payment unless the executive director authorizes installment payments. If the payment made is less than the full required payment, including interest, the formula service credit granted shall be adjusted in accordance with section 354.05, subdivision 25, clause (3). Any school district or institution which employs a teacher who makes a payment pursuant to this subdivision is authorized to make any required payments representing employer contributions and interest and the required amounts are hereby appropriated from any funds available to the school district or institution. Any payments made pursuant to this subdivision shall be considered accumulations made after July 1, 1957 for purposes of computing an annuity pursuant to section 354.44, subdivision 2. All payments shall be made to the executive director prior to July 1, 1973 or within one year after the completion of the minimum state teaching service requirements whichever is later.
Subd. 5. Payment of shortages.
(a) Except as provided in paragraph (b), in the event that full required member contributions are not deducted from the salary of a teacher, payment must be made as follows: