Montana Teachers’ Retirement System: Tiers, Eligibility & Payout Options

The Montana Teachers’ Retirement System is a defined-benefit pension plan for public school teachers, administrators, and certain other education employees, and almost every rule that governs your benefit turns on one question: whether you joined before or on/after July 1, 2013. Members who joined before that date are Tier 1; members who joined on or after it are Tier 2. The plan is governed by Title 19, Chapter 20 of the Montana Code Annotated and must remain tax-qualified under Section 401(a) of the Internal Revenue Code.¹

Which Tier You’re In

Your tier controls your contribution rate, when you can retire without a penalty, how your monthly benefit is calculated, and how much that benefit grows each year after you retire. There are only two tiers, and the dividing line is July 1, 2013.²

Tier 1: you joined TRS before July 1, 2013, and have not withdrawn your account balance since then.
Tier 2: you joined TRS on or after July 1, 2013. Former Tier 1 members who withdrew their account balance and later returned to TRS-covered employment on or after that date are also reclassified as Tier 2.

That second bullet catches people off guard. If you left teaching, pulled your contributions out, and came back after mid-2013, your Tier 1 status is gone for good, even if you were originally hired in the 1990s.²

When You Can Retire

Both tiers vest after five years of creditable service. Vesting locks in your right to a future benefit even if you leave teaching, but the age at which you can actually collect that benefit without a reduction depends on which tier you’re in.

Tier 1

Tier 1 members qualify for a full, unreduced benefit at either of these points:²

Age 60 with at least five years of creditable service.
Any age with 25 or more years of creditable service.

The “any age” option is what makes Tier 1 unusually generous. A teacher who started at 23 could retire with a full benefit at 48.

Tier 2

Tier 2 members face tighter requirements:²

Age 60 with at least five years of creditable service.
Age 55 with 30 or more years of creditable service.

There is no “any age” path for Tier 2. Even 30 years of service won’t produce an unreduced benefit before 55.

Tier 2 members who are at least 55 and vested can retire early, but the monthly benefit is permanently reduced for every month you retire before your normal retirement date.² Ask TRS for an estimate showing your specific reduction before deciding.

What You Pay In

Both you and your employer contribute out of every paycheck. The member contribution set by statute is 7.15% of earned compensation for Tier 1 members and 8.15% for Tier 2 members.³

School districts, education co-ops, counties, and community colleges pay 9.47% of each active member’s compensation on the employer side. State agencies and the Montana University System pay 11.85%.⁴ The 9.47% school-district rate is confirmed through at least fiscal year 2027.⁵

Montana teachers also participate in Social Security, so a separate 6.2% Social Security deduction appears on your pay stub in addition to your TRS contribution.

How Your Monthly Benefit Is Calculated

TRS pays a formula-driven benefit, not an account balance. Three numbers determine your monthly check: your years of creditable service, your average final compensation (AFC), and a percentage multiplier.

The standard formula is:²

Years of Creditable Service × AFC × 1.6667%

The result is your gross annual benefit, paid in 12 equal monthly installments. A teacher with 30 years of service and an AFC of $65,000 would receive roughly $32,501 per year, or about $2,708 per month before taxes.

The AFC itself is calculated differently for each tier:²

Tier 1: average of your three highest consecutive fiscal years of earned compensation.
Tier 2: average of your five highest consecutive fiscal years of earned compensation.

A late-career salary bump has less impact on a Tier 2 benefit because it’s diluted across five years instead of three.

Tier 2 members who retire with at least 30 years of creditable service and are at least 60 years old get a better multiplier of 1.85% instead of 1.6667%. On the example above, that raises the annual benefit from about $32,501 to $36,075, roughly $298 more per month for the rest of retirement.

Annual Increases After Retirement

TRS pays a Guaranteed Annual Benefit Adjustment (GABA) each January once you’ve received at least 36 monthly benefit payments.⁶

Tier 1 retirees: 1.5% annual increase.
Tier 2 retirees: 0.5% annual increase, with the possibility of increases in 0.5% increments up to 1.5% if TRS reaches a funded ratio of 90% or higher.

The Tier 2 GABA is tied to the system’s financial health. If an actuarial valuation shows an increase would drop the funded ratio below 85%, it won’t happen.⁶ At 0.5% per year, Tier 2 retirees should plan for their TRS benefit to lag inflation over a long retirement.

Choosing How Your Benefit Is Paid

When you retire, you pick the annuity structure that will pay your benefit. The choice is permanent and controls whether anyone receives payments after your death.⁷

Single Life Annuity: the highest monthly amount, paid for your lifetime only. Payments stop at your death.
Joint and Survivor Annuity: a reduced monthly amount during your lifetime, with a continuing benefit to your named joint annuitant after your death. You choose whether the survivor receives one-half, two-thirds, or the full amount.
Period Certain and Life Annuity: a reduced monthly amount guaranteed for either 10 or 20 years. If you die within the guaranteed period, your beneficiaries receive payments for the rest of that period.

The more protection you build in for a survivor, the smaller your check while you’re alive. TRS will show you the dollar amounts for each option before you commit.

Termination Pay Choices

When you leave your final teaching position, you’ll likely receive termination pay for unused sick leave, vacation, or similar accruals. Montana law gives you three options for how that money interacts with your retirement:⁸

Roll the full termination pay into your AFC calculation. You and your employer pay additional contributions on the amount at termination.
Spread the termination pay evenly across the years used in your AFC calculation. This also requires additional contributions from you and your employer.
Take the termination pay as cash and leave it out of your retirement calculation. No extra contributions.

The first two options raise your monthly benefit permanently but cost money upfront. To get the tax-deferral advantage, you and your employer must complete and sign the required election form at least 90 days before your termination date.⁹ TRS suggests asking your employer for a termination pay estimate six to 12 months before you plan to retire, then requesting a benefit estimate from TRS that includes the termination pay so you can compare the options side by side.

Leaving Teaching Before Retirement

If you leave Montana teaching before you’re ready to collect a pension, you have two paths. You can leave your contributions with TRS and take a benefit later once you meet the age rules, or you can withdraw your accumulated contributions as a lump sum. An active member can request a refund starting 30 days before their termination date.

A refund is irrevocable. Once processed, you forfeit all creditable service and any right to a future benefit. Refunds include your own contributions plus interest; employer contributions stay with TRS. And if you’re Tier 1, a withdrawal permanently ends your Tier 1 status. Return to teaching later and you come back as Tier 2, subject to the less favorable rules described above.²

Buying Service Credit for Gaps

If you have gaps in your service history, you may be able to purchase additional creditable service to increase your benefit or reach vesting sooner. Common categories include military service, out-of-state teaching, and leaves of absence. An aggregate cap of five years applies across most purchase types.¹⁰

If you left a TRS-covered job for active military duty and returned to your employer within the timeframes required by USERRA, you can purchase up to five years of creditable service. The cost equals the member contributions you would have paid during the military period, matched by your employer, and the purchase must be completed within five years of your return to avoid interest charges.¹⁰

Vested members who taught outside Montana, including at federal schools or institutions abroad, can also purchase that service, subject to the five-year cap. If you contributed to another public retirement system for that teaching (other than Social Security), you must refund those contributions or roll them into TRS before purchasing the credit.¹⁰

Returning to Work After You Retire

Retired teachers can return to TRS-covered work, but only after a break in service of at least 120 calendar days from the termination date.¹¹ One narrow exception: you can substitute up to 45 days during the break to fill in for a regular teacher who is temporarily absent.

Once the break period ends, your earnings in a TRS-covered position are capped. The maximum is the greater of 49% of the AFC used to calculate your retirement benefit (adjusted annually for inflation) or 49% of the median AFC as set by the TRS Board.¹² Exceeding the cap can trigger a reduction or suspension of your retirement benefit. Track your earnings carefully if you go back.

Employers pay a higher rate for working retirees: 11.85% for school districts, compared with 9.47% for active members, and 20.11% for “emergency hire” working retirees.⁴

Disability and Survivor Benefits

Members who become physically or mentally unable to perform their job duties may qualify for disability retirement. You must be vested with at least five years of creditable service, the disability must have occurred while you were an active contributing member, and the condition must be likely permanent.¹³ The TRS Board reviews every application and can require medical re-examinations once a year during the first five years of disability retirement, then once every three years, for any disability retiree under 60. If the Board finds you’re no longer incapacitated, or you refuse the examination, your disability benefit is canceled.¹⁴

If a member dies before retirement, beneficiaries of a non-vested member receive a lump sum of the member’s accumulated contributions plus interest. Beneficiaries of a vested member can choose between that lump sum and a lifetime monthly benefit. You can name any living person, your estate, or a trust as beneficiary; multiple primary beneficiaries share equally, and TRS does not allow percentage splits.¹⁵ Without a valid designation on file, TRS pays the account balance as a lump sum in a statutory priority order beginning with the surviving spouse. Keep your designation current after marriage, divorce, or the birth of a child.

For members who have already retired, survivor benefits depend entirely on the payment option chosen at retirement.⁷

Filing Your Retirement Application

The retirement application must be filed before your final day of work.¹⁶ You’ll provide your employment history, your last day of employment, and your selection of a payment option. TRS then verifies your eligibility and calculates the benefit.

Start six to 12 months out. That window gives you time to request a termination pay estimate from your employer, get a benefit estimate from TRS showing your payment options, and complete the termination pay election within its 90-day deadline.⁹ Your first monthly benefit is paid only after TRS processes everything and you’ve attained retired status, so building in lead time prevents a gap in income.

1
Montana Teachers’ Retirement System. Governing Laws
2
Montana Teachers’ Retirement System. Understand Your Benefits
3
Montana State Legislature. Montana Code 19-20-602 – Annuity Savings Account Member Contribution
4
Montana Teachers’ Retirement System. Contribution Rates
5
Montana Teachers’ Retirement System. 2025 Legislative Changes Affecting TRS Employers
6
Montana Teachers’ Retirement System. Guaranteed Annual Benefit Adjustment
7
Montana Teachers’ Retirement System. Benefit Payments
8
Montana State Legislature. Montana Code 19-20-716 – Termination Pay
9
Montana Teachers’ Retirement System. Fact Sheet: Termination Pay
10
Montana Teachers’ Retirement System. Fact Sheet: Creditable Service and Service Purchases
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Montana State Legislature. Montana Code 19-20-734 – Break-in-Service Requirements
12
Montana Teachers’ Retirement System. Fact Sheet: Working After Retirement
13
Montana Teachers’ Retirement System. Fact Sheet: Disability Retirement
14
Montana State Legislature. Montana Code 19-20-903 – Medical Examination of Disability Retiree
15
Montana Teachers’ Retirement System. Fact Sheet: Beneficiary Designations for Active Members
16
Montana Teachers’ Retirement System. Fact Sheet: Terminating Employment and Retiring With TRS