Updated October 30, 2026. Quick answer: Michigan’s public school retirement system (MPSERS) pays a Member Investment Plan (MIP) member 1.5% of final average compensation for each year and fraction of a year of credited service. Computed for 30 years and $60,000 of final average compensation, that is $27,000 a year (computed), or $2,250 a month (computed). A member who joined before July 1, 2010 can retire with 30 years at any age, at 60 with 10 years, or from 55 with 15 years at a reduced amount; one who joined on or after that date can retire at 60 with 10 years. Enter your own numbers below; the figure is the basic allowance, before any payment option.
Calculate your MPSERS allowance
This page applies the allowance formula in the Public School Employees Retirement Act to your service, age and final average compensation. It runs on this page and sends nothing anywhere. It covers the 1.5% formula of Section 84, which the statute applies to a member who contributes to the member investment plan. Enter your credited service from your Office of Retirement Services (ORS) statement, whole years and months, the whole age you will have reached on your retirement date, and your final average compensation as an annual amount. If part of your service falls after the date the statute calls the transition date or the attainment date, enter that part in the 1.25% boxes; if none of it does, leave those boxes at 0.
For a decision, use ORS itself: its online account prices your exact retirement date and payment option at michigan.gov/orsschools. This page is the published formula, shown so you can see the arithmetic.
The formula, as the statute prints it
Section 84 of the Act (MCL 38.1384) sets the allowance: “a member shall receive a retirement allowance that equals the product of the member’s total years, and fraction of a year, of credited service multiplied by 1.5% of the member’s final average compensation”. That is why the calculator takes service in years and months and returns a yearly amount.
Not every year earns 1.5%. Section 84b changes the rate for a member who made one of the statute’s 2012 elections, and says the later service is “multiplied by 1.25% of final average compensation”: “The years and fraction of a year of credited service accrued to the member on and after the transition date.” Earlier service stays at “1.5% of final average compensation as provided in section 84”. A member who made the other election gets no later service in the formula at all: the allowance “must not include any year or fraction of a year of service performed by the member on and after the transition date”. The calculator therefore has two service boxes, one for each rate. Your ORS statement shows which of your service falls on each side; the statute’s wording for a member who made the election with an attainment date is parallel, with that date in place of the transition date.
Worked example, calculated for 30 years at 1.5% and $60,000 of final average compensation: 1.5% x 30 = 45% of $60,000 = $27,000 a year (computed), $2,250 a month (computed). With 20 years at 1.5% and 5 years at 1.25%: (1.5% x 20) + (1.25% x 5) = 36.25% of $60,000 = $21,750 a year (computed), $1,812.50 a month (computed).
What the formula gives at each length of service at 1.5%, at $60,000 of final average compensation, for a member retiring at 62:
| Years of service | Share of average | Annual allowance | Monthly allowance |
|---|---|---|---|
| 10 | 15% (computed) | $9,000 (computed) | $750 (computed) |
| 15 | 22.5% (computed) | $13,500 (computed) | $1,125 (computed) |
| 20 | 30% (computed) | $18,000 (computed) | $1,500 (computed) |
| 25 | 37.5% (computed) | $22,500 (computed) | $1,875 (computed) |
| 30 | 45% (computed) | $27,000 (computed) | $2,250 (computed) |
| 35 | 52.5% (computed) | $31,500 (computed) | $2,625 (computed) |
What final average compensation is
It is not your final salary. Section 4 defines it as “the aggregate amount of a member’s compensation earned within the averaging period in which the aggregate amount of compensation was highest divided by the member’s number of years, including any fraction of a year, of credited service during the averaging period”. The averaging period depends on when you joined: “The averaging period shall be 36 consecutive calendar months if the member contributes to the member investment plan except for a member who contributes to the member investment plan and first became a member on or after July 1, 2010; otherwise, the averaging period shall be 60 consecutive calendar months.” The calculator takes the figure ORS shows on your statement, so it does not need the rule, and does not test what counts as compensation.
When you can retire
Section 81 (MCL 38.1381) lists three tests. First, “The member is 55 years of age or older and has 30 or more years of credited service as provided under this act of which at least 15 years were served as a public school employee.” Second, “The member is 60 years of age or older and has accumulated 10 or more years of credited service as a public school employee.” Third, “The member is 55 years of age or older and has 15 or more years of credited service, but less than 30 years of credited service of which the last 5 consecutive years are immediately preceding the member’s retirement allowance effective date.”
For a member who contributes to the member investment plan, Section 43b modifies the first two: “The age 55 requirement of section 81(1)(a) shall not apply.” So a member who joined before July 1, 2010 with 30 years, 15 of them as a public school employee, can retire at any age. The 10-year test becomes 5 years only “if the member is working as a public school employee and the member received credited service in each of the 5 school fiscal years immediately preceding the retirement allowance effective date”. The calculator does not test that exception: with 5 to 9 years at 60 it shows the formula amount and says the exception decides whether the member can retire. It also assumes that a member with 30 years has at least 15 as a public school employee, and that a member from 55 with 15 to 29 years meets the last-five-years condition.
A member who first joined on or after July 1, 2010 has one test. Section 81c allows retirement only for a member who “is 60 years of age or older and has accumulated 10 or more years of credited service pursuant to section 68 as a public school employee and has reached regular retirement age”. It adds “The eligibility requirements of subsection (1) must not be modified as provided in section 43b.” The regular retirement age is 60 for a member who joined before February 1, 2018, and “Subject to subsection (5), for a member who first becomes a member on or after February 1, 2018, 60 years of age.” Subsection (5) lets the retirement board raise that age; this calculator uses 60 and does not apply any increase.
Retiring before 60 with under 30 years: the reduction
Section 84(2) reduces the allowance for a member who retires early without 30 years: “If a member having less than 30 years credited service retires before the member’s sixtieth birthday as provided in section 81”, “the member’s retirement allowance provided in subsection (1) shall be reduced 1/2 of 1% for each month, and fraction of a month, within the period from the effective date of the member’s retirement to the date of the member’s sixtieth birthday”. The calculator counts the months from your age at retirement to 60, so each whole year under 60 is a 6% reduction (computed). A member with 30 years has no reduction, and neither does a member who first joined on or after July 1, 2010, who cannot retire before 60.
Worked example, calculated for 20 years at 1.5% and $60,000 of final average compensation, a member who joined before July 1, 2010 and retires at 57: the allowance before reduction is $18,000 a year (computed), 36 months before the sixtieth birthday is 18% (computed), and the allowance is $14,760 a year (computed), $1,230 a month (computed).
Reduction by age at 20 years of service and $60,000 of final average compensation:
| Age at retirement | Reduction | Annual allowance | Monthly allowance |
|---|---|---|---|
| 55 | 30% (computed) | $12,600 (computed) | $1,050 (computed) |
| 56 | 24% (computed) | $13,680 (computed) | $1,140 (computed) |
| 57 | 18% (computed) | $14,760 (computed) | $1,230 (computed) |
| 58 | 12% (computed) | $15,840 (computed) | $1,320 (computed) |
| 59 | 6% (computed) | $16,920 (computed) | $1,410 (computed) |
A member with 12 years of service who is 57 cannot retire on these tests, because the 55-to-59 path needs 15 years; the calculator says so.
What to do next
1. Get ORS’s own number. The online account prices your exact retirement date, reduction and payment option; this page is the printed formula.
2. The rest of the MPSERS decisions. Payment options, the refund and buying service are on the Michigan MPSERS retirement decisions page, the annual increase is on the post-retirement increases page, and the latest figure is on the Michigan MPSERS COLA page.
3. Tax. Michigan’s treatment of pension income is on the Michigan pension tax page. Federal tax applies too: “The taxable part of your pension or annuity payments is generally subject to federal income tax withholding.” The withholding form is described on the IRS page for Form W-4P: “so your payer can withhold the correct amount of federal income tax from your periodic pension, annuity”.
Where this calculator stops
It prices one thing: the Section 84 allowance for a member who contributes to the member investment plan, retiring from service. It does not price a member of the Basic plan, whose service retirement tests are Section 81 without the MIP changes, or a member of any other MPSERS plan. It leaves out disability retirement, the payment options and survivor choices, the annual increase, purchased service and its cost (the pension buyback calculator covers purchases in general), the limit on service from outside the system, the pre-1974 recalculations in Section 84, and the retirement health benefit. It reads service, age and compensation as you enter them.
How it was checked: a second, independent engine (exact fractions, with the 1.5%, the 1.25%, the reduction rate and the age and service tests read from the archived statute text) agreed with this page’s engine on 240,000 random combinations of service, age, cohort and pay, and the shipped script was driven in a browser on a grid of cases against both. The rules were read from MCL 38.1304, 38.1343b, 38.1381, 38.1381c, 38.1384 and 38.1384b as printed on the Michigan Legislature website, which states it is complete through PA 114 of 2026.
Common mistakes
- Entering a monthly salary. The Section 84 formula uses final average compensation as an annual amount, and the allowance it returns is a yearly figure.
- Using your final salary. The statute averages the highest 36 or 60 consecutive months, set by when you joined.
- Putting all your service at 1.5% when part of it falls after your transition or attainment date. That part is 1.25%, or is left out of the formula.
- Expecting to retire at any age with 30 years if you first joined on or after July 1, 2010. That member’s only test is age 60 with 10 years.
Related: Michigan MPSERS retirement decisions, public pension decisions by system, single life versus joint and survivor, and Michigan retirement taxes.
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Answer againSources
- Michigan Compiled Laws 38.1304, Section 4, definitions (final average compensation) (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- Michigan Compiled Laws 38.1343b, Section 43b, member investment plan eligibility requirements (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- Michigan Compiled Laws 38.1381, Section 81, retirement allowance eligibility (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- Michigan Compiled Laws 38.1381c, Section 81c, member 60 years of age or older with 10 or more years of service (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- Michigan Compiled Laws 38.1384, Section 84, retirement allowance (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- Michigan Compiled Laws 38.1384b, Section 84b, retirement allowance for a member making an alternative election (Public School Employees Retirement Act of 1979, Act 300 of 1980; page states Complete Through PA 114 of 2026): https://www.legislature.mi.gov/Laws/MCL (section page)
- IRS, Topic no. 410, Pensions and annuities: https://www.irs.gov/taxtopics/tc410
- IRS, About Form W-4P, Withholding Certificate for Pension or Annuity Payments: https://www.irs.gov/forms-pubs/about-form-w-4p
Read from the system publications linked above on October 30, 2026. General information, not legal or tax advice, and not an estimate from the retirement system. Your own facts decide the outcome, and your retirement system, your plan administrator or a benefits advisor is the right place to confirm anything consequential.