Participating members shall receive benefits according to this section and according to rules adopted by the board, not inconsistent with this chapter. No person is entitled to receive a prior service benefit if the person was not continuously employed by a governmental unit in North Dakota for a period of not less than two years immediately prior to eligibility for retirement.

1.    Participating members shall receive credit for full-time employment or its equivalent from the date they attain eligibility until their normal retirement date, postponed retirement date, or early retirement date, as defined in this section. Part-time employment will be recognized as full-time employment on a prorated basis as the board may prescribe.

2.    Retirement benefits are calculated from the participating member’s final average salary, which is the average of the highest salary received by the member for any thirty-six months employed during the last one hundred twenty months of employment.

For members who terminate employment on or after August 1, 2010, final average salary is the average of the highest salary received by the member for any thirty-six months employed during the last one hundred eighty months of employment. For members who terminate employment between July 31, 2005, and August 1, 2010, final    average salary is the average of the highest salary received by the member for any thirty-six months employed during the period for which the board has appropriate and accurate salary records on the board’s electronic database, but that period may not be more than the last one hundred eighty months of employment. For members who terminate employment after December 31, 2019, final average salary is the higher of the final average salary calculated on December 31, 2019, or the average salary earned in the three highest periods of twelve consecutive months employed during the last one hundred eighty months of employment. Months without earnings are excluded for the purpose of computing an average. If the participating member has worked for less than thirty-six months at the normal retirement date, the final average salary is the average salary for the total months of employment.

3.    Retirement dates are defined as follows:

a.    Normal retirement date, except for a national guard security officer or firefighter, a firefighter employed by a political subdivision, a peace officer employed by the state, or a peace officer or correctional officer employed by a political subdivision, is:

(1) The first day of the month next following the month in which the member attains the age of sixty-five years; or

(2) When the member has a combined total of years of service credit and years of age equal to eighty-five and has not received a retirement benefit under this chapter.

b.    Normal retirement date for members first enrolled after December 31, 2015, except for a national guard security officer or firefighter, a firefighter employed by a political subdivision, a peace officer employed by the state, a peace officer or correctional officer employed by a political subdivision, or a supreme court or district court judge, is:

(1) The first day of the month next following the month in which the member attains the age of sixty-five years; or

(2) When the member has a combined total of years of service credit and years of age equal to ninety and the member attains a minimum age of sixty and has not received a retirement benefit under this chapter.

c.    Normal retirement date for a national guard security officer or firefighter is:

(1) The first day of the month next following the month in which the national guard security officer or firefighter attains the age of fifty-five years and has completed at least three eligible years of employment; or

(2) When the national guard security officer or firefighter has a combined total of years of service credit and years of age equal to eighty-five and has not received a retirement benefit under this chapter.

d.    Normal retirement date for a peace officer, firefighter, or correctional officer employed by a political subdivision is:

(1) The first day of the month next following the month in which the peace officer, firefighter, or correctional officer attains the age of fifty-five years and has completed at least three eligible years of employment; or

(2) When the peace officer, firefighter, or correctional officer has a combined total of years of service credit and years of age equal to eighty-five and has not received a retirement benefit under this chapter.

e.     (1) Normal retirement date for a peace officer employed by the bureau of criminal investigation is:

(a)     [1] For a member employed before August 1, 2023, the first day of the month next following the month in which the peace officer attains the age of fifty-five years and has completed at least three eligible years of employment; and

[2] For a member employed after July 31, 2023, the first day of the month next following the month in which the peace officer attains the age of fifty-five years and has completed at least ten eligible years of employment; or

(b)    When the peace officer has a combined total of years of service credit and years of age equal to eighty-five and has not received a retirement benefit under this chapter.

(2) Normal retirement date for a peace officer employed by the state, other than a peace officer employed by the bureau of criminal investigation, is:

(a)    The first day of the month next following the month in which the peace officer attains the age of fifty-five years and has completed at least three eligible years of employment; or

(b)    When the peace officer has a combined total of years of service credit and years of age equal to eighty-five and has not received a retirement benefit under this chapter.

f.    Postponed retirement date is the first day of the month next following the month in which the member, on or after July 1, 1977, actually severs or has severed the member’s employment after reaching the normal retirement date.

g.     (1) Early retirement date, except for a national guard security officer or firefighter, a firefighter, peace officer, or correctional officer employed by a political subdivision, or a peace officer employed by the state, is the first day of the month next following the month in which the member attains the age of fifty-five years and has completed three years of eligible employment.

(2) For a national guard security officer or firefighter, early retirement date is the first day of the month next following the month in which the national guard security officer or firefighter attains the age of fifty years and has completed at least three years of eligible employment.

(3) For a peace officer employed by the state, other than a peace officer employed by the bureau of criminal investigation, or a firefighter, peace officer, or correctional officer employed by a political subdivision, early retirement date is the first day of the month next following the month in which the peace officer, firefighter, or correctional officer attains the age of fifty years and has completed at least three years of eligible employment.

(4) For a peace officer employed by the bureau of criminal investigation, early retirement date is the first day of the month next following the month in which the peace officer attains the age of fifty years and has completed at least three years of eligible employment.

h.    Disability retirement date is the first day of the month after a member becomes permanently and totally disabled, according to medical evidence called for under the rules of the board, and has completed at least one hundred eighty days of eligible employment. For supreme and district court judges, permanent and total disability is based solely on a judge’s inability to perform judicial duties arising out of physical or mental impairment, as determined pursuant to rules adopted by the board or as provided by subdivision a of subsection 3 of section 27-23-03.

(1) A member is eligible to receive disability retirement benefits only if the member became disabled during the period of eligible employment and applies for disability retirement benefits within twelve months of the date the member terminates employment.

(2) A member is eligible to continue to receive disability benefits as long as the permanent and total disability continues and the member submits the necessary documentation and undergoes medical testing required by the board, or for as long as the member participates in a rehabilitation program required by the board, or both. If the board determines a member no longer meets the eligibility definition, the board may discontinue the disability retirement benefit. The board may pay the cost of any medical testing or rehabilitation services the board deems necessary and these payments are appropriated from the retirement fund for those purposes. A member’s receipt of disability benefits under this section is limited to receipt from the fund to which the member was actively contributing at the time the member became disabled.

4.    The board shall calculate retirement benefits as follows:

a.    Normal retirement benefits for all retirees, except supreme and district court judges, peace officers employed by the bureau of criminal investigation, and other peace officers employed by the state, reaching normal retirement date equal an annual amount, payable monthly, comprised of a service benefit and a prior service benefit, as defined in this chapter, which is determined as follows:

(1) For members first enrolled:

(a)    Before January 1, 2020, service benefit equals two percent of final average salary multiplied by the number of years of service employment.

(b)    After December 31, 2019, service benefit equals one and seventy-five hundredths percent of final average salary multiplied by the number of years of service employment.

(2) Prior service benefit equals two percent of final average salary multiplied by the number of years of prior service employment.

b.    Normal retirement benefits for all supreme and district court judges under the public employees retirement system reaching normal retirement date equal an annual amount, payable monthly, comprised of a benefit as defined in this chapter, determined as follows:

(1) Benefits must be calculated from the time of appointment or election to the bench and must equal three and one-half percent of final average salary multiplied by the first ten years of judicial service, two and eighty hundredths percent of final average salary multiplied by the second ten years of judicial service, and one and one-fourth percent of final average salary multiplied by the number of years of judicial service exceeding twenty years.

(2) Service benefits must include, in addition, an amount equal to the percent specified in subdivision a of final average salary multiplied by the number of years of nonjudicial employee service and employment.

c.    Normal retirement benefits for a peace officer employed by the bureau of criminal investigation reaching the normal retirement date equals an annual amount, payable monthly, comprised of a service benefit and a prior service benefit determined as follows:

(1) The first twenty years of credited service multiplied by three percent of final average salary.

(2) For years in excess of twenty years of credited service multiplied by one and seventy-five hundredths percent of final average salary.

d.    Normal retirement benefits for a peace officer employed by the state, other than by the bureau of criminal investigation, reaching the normal retirement date equals an annual amount, payable monthly, comprised of a service benefit and a prior service benefit determined as follows: (1) For members first enrolled:

(a)    Before January 1, 2020, service benefit equals two percent of final average salary multiplied by the number of years of service employment.

(b)    After December 31, 2019, service benefit equals one and seventy-five hundredths percent of final average salary multiplied by the number of years of service employment.

(2) Prior service benefit equals two percent of final average salary multiplied by the number of years of prior service employment.

e.    Postponed retirement benefits are calculated as for single life benefits for those members who retired on or after July 1, 1977.

f.    Early retirement benefits are calculated as for single life benefits accrued to the date of termination of employment, but must be actuarially reduced to account for benefit payments beginning before the normal retirement date, as determined under subsection 3. Except for a national guard security officer or firefighter, a firefighter, peace officer, or correctional officer employed by a political subdivision,    a peace officer employed by the state, or a supreme court or district court judge, early retirement benefits for members first enrolled after December 31, 2015, are calculated for single life benefits accrued to the date of termination of employment, but must be reduced by fixed rate of eight percent per year to account for benefit payments beginning before the normal retirement date. A retiree, other than a supreme or district court judge, is eligible for early retirement benefits only after having completed three years of eligible employment. A supreme or district court judge retiree is eligible for early retirement benefits only after having completed five years of eligible employment.

g.    Except for supreme and district court judges, disability retirement benefits are twenty-five percent of the member’s final average salary. Disability retirement benefits for supreme and district court judges are seventy percent of final average salary reduced by the member’s primary social security benefits and by any workforce safety and insurance benefits paid. The minimum monthly disability retirement benefit under this section is one hundred dollars.

5.    Upon termination of employment after completing three years of eligible employment, except for supreme and district court judges, who must complete five years of eligible employment, but before normal retirement date, a member who does not elect to receive early retirement benefits is eligible to receive deferred vested retirement benefits payable commencing on the member’s normal retirement date in one of the optional forms provided in subsection 9. Members who have delayed or inadvertently failed to apply for retirement benefits to commence on their normal retirement date may choose to receive either a lump sum payment equal to the amount of missed payments, or an actuarial increase to the form of benefit the member has selected, which increase must reflect the missed payments.

6.    If before retiring a member dies after completing three years of eligible employment, except for supreme and district court judges, who must have completed five years of eligible employment, the board shall pay the member’s account balance to the member’s designated beneficiary as provided in this subsection. If the member has designated an alternate beneficiary with the surviving spouse’s written consent, the board shall pay the member’s account balance to the named beneficiary. If the member has named more than one primary beneficiary, the board shall pay the member’s account balance to the named primary beneficiaries in the percentages designated by the member or, if the member has not designated a percentage for the beneficiaries, in equal percentages. If one or more of the primary beneficiaries has predeceased the member, the board shall pay the predeceased beneficiary’s share to the remaining primary beneficiaries. If any beneficiary survives the member, yet dies before distribution of the beneficiary’s share, the beneficiary must be treated as if the beneficiary predeceased the member. If there are no remaining primary beneficiaries, the board shall pay the member’s account balance to the contingent beneficiaries in the same manner. If there are no remaining designated beneficiaries, the board shall pay the member’s account balance to the member’s estate. If the member has not designated an alternate beneficiary or the surviving spouse is the beneficiary, the surviving spouse of the member may select a form of payment as follows:

a.    If the member was a supreme or district court judge, the surviving spouse may select one of the following optional forms of payment:

(1) A lump sum payment of the member’s retirement account as of the date of death.

(2) Payments as calculated for the deceased member as if the member was of normal retirement age at the date of death, payable until the spouse dies.

b.    The surviving spouse of all other members may select one of the following options:

(1) A lump sum payment of the member’s retirement account as of the date of death.

     (2) Payment of a monthly retirement benefit equal to fifty percent of the deceased member’s accrued single life retirement benefits until the spouse dies.

(3) If the member dies on or after the member’s normal retirement date, the payment of a monthly retirement benefit equal to an amount that would have been paid to the surviving spouse if the member had retired on the day of the member’s death and had selected a one hundred percent joint and survivor annuity, payable until the spouse dies. A surviving spouse who received a benefit under this subsection as of July 31, 1995, is entitled to the higher of that person’s existing benefit or the equivalent of the accrued benefit available under the one hundred percent joint and survivor provision as if the deceased member were of normal retirement age, with the increase payable beginning August 1, 1995.

7.    If a member not coming under the provisions of subsection 6 terminates employment because of death, permanent and total disability, or any voluntary or involuntary reason prior to retirement, the member or the member’s designated beneficiary is entitled to the member’s account balance at termination. The board automatically shall refund a member’s account balance if the member has completed less than three years of eligible employment, has an account balance of less than one thousand dollars, and was not a supreme or district court judge. If the member was a supreme or district court judge, the board automatically shall refund a member’s account balance if the member completed less than five years of eligible employment. A member may waive the refund if the member submits a written statement to the board, within thirty days after termination, requesting that the member’s account balance remain in the fund.

8.    The surviving spouse of a member receiving retirement benefits must be the member’s primary beneficiary unless there is no surviving spouse or the surviving spouse designates an alternate beneficiary in writing. If a member receiving retirement benefits or the member’s surviving spouse receiving retirement benefits dies before the total amount of benefits paid to either or both equals the amount of the member’s account balance at retirement, the difference must be paid to the named beneficiary of the recipient or, if there is no named beneficiary, to the recipient’s estate. A benefit payment owed to the member, surviving spouse, or alternate beneficiary which was not paid before the death of the member, surviving spouse, or alternate beneficiary must be paid to the named beneficiary of the recipient or, if there is no named beneficiary, to the recipient’s estate.

9.    The board shall adopt rules providing for the receipt of retirement benefits in the following optional forms:

a.    Single life.

b.    An actuarially equivalent joint and survivor option, with fifty percent or one hundred percent options.

c.    Actuarially equivalent life with ten-year or twenty-year certain options.

d.    An actuarially equivalent partial lump sum distribution option with a twelve-month maximum lump sum distribution.

e.    An actuarially equivalent graduated benefit option with either a one percent or two percent increase to be applied the first day of January of each year.

Except for supreme and district court judges, unless a member specifically requests that the member receive benefits according to one of these options at the time of applying for retirement, all retirement benefits must be in the form of a single life benefit. For supreme and district court judges, unless a member specifically requests that the member receive benefits according to one of these options at the time of applying for retirement, all retirement benefits must be in the form of a lifetime monthly pension with fifty percent of the benefit continuing for the life of the surviving spouse, if any.

10.    The fund may accept rollovers from other eligible plans under rules adopted by the board for the purchase of additional service credit, but only to the extent the transfer is    a rollover contribution that meets the requirement of section 408 of the Internal Revenue Code.

11.    The board may accept trustee-to-trustee transfers as permitted by Internal Revenue Code section 403(b)(13) and section 457(e)(17) from an Internal Revenue Code section 403(b) annuity or Internal Revenue Code section 457 deferred compensation plan for the purchase of permissive service credit, as defined in Internal Revenue Code section 415(n)(3)(A) or as repayment of a cashout from a governmental plan under Internal Revenue Code section 415(k)(3).

12.    The board may establish individual retirement accounts and individual retirement annuities as permitted under section 408(q) of the Internal Revenue Code to allow employees to make voluntary employee contributions. The board may adopt rules to implement and administer the accounts and annuities under this section.