Updated September 3, 2026. Quick answer: Massachusetts Teachers’ Retirement System (MTRS): the COLA is discretionary (granted by legislative vote) and is applied to a fixed $13,000 base, not compounded, service credit can be purchased, and no DROP was found. Vesting takes 10 years of creditable service.
Provisional. This page is published at medium confidence. The specific points that could not be confirmed are listed under What could not be verified below, and are named rather than smoothed over.
The verdicts
| Is the COLA granted? | Discretionary (Legislature votes each cycle) |
|---|---|
| Is the COLA compounded? | Not compounded (fixed $13,000 base) |
| Vesting | 10 years of creditable service |
| Buy service credit? | Yes |
| DROP? | None found |
| State | Massachusetts |
Those first two rows are separate questions and are routinely confused. Whether you get an increase at all is one thing; whether it compounds is another. A system can grant an increase automatically every year and still compute it against your original benefit forever, which is a materially worse deal than it sounds.
The COLA
“Cost-of-living adjustments are granted to MTRS benefit recipients by vote of the Massachusetts Legislature.” The base never grows: “the retirement base on which a COLA is granted is $13,000. Accordingly, if the Legislature grants a 3% COLA effective July 1, a benefit recipient may have his or her allowance increased by a maximum of $390 per year, or $32.50 per month.” The FY2027 grant matched that structure: “an increase of three percent on the first $13,000 of your retirement benefit, for a maximum increase of $390 per year or $32.50 per month (3% x $13,000/year = $390/year; $390/year ÷ 12 months = $32.50/month).”
Buying service credit
MTRS members can purchase military service during membership (generally up to 4 years, no interest on the first invoice), other Massachusetts public service (up to 20 years, actuarial interest currently 7.0%), a full refund buyback of previously refunded MTRS service (no cap, 7.0% interest), and out-of-state teaching (up to 10 years, buyback interest currently 3.5%).
Run your own numbers before deciding: some purchases never recover their cost, and the calculator shows which.
Coordinate this with your overall retirement plan
An adviser can help weigh a COLA that may not compound, a service-credit purchase that may never pay for itself, or a DROP election against the rest of your retirement plan, but that does not replace the numbers in your own member statement.
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Vesting
mass.gov itself returned HTTP 403 on every path tried this session; MTRS’s own official state domain, mtrs.state.ma.us, was used instead. MTRS’s tier comparison chart gives retirement eligibility (the closest stated threshold, not a standalone vesting definition) as: Tier 1 (enrolled before April 2, 2012) may retire with 20 years of creditable service at any age, or at age 55 with 10 years of creditable service; Tier 2 (enrolled on or after April 2, 2012) may retire at age 60 with at least 10 years of creditable service. Both tiers share a 10-year floor, which this page reports as the vesting figure; a single standalone “you vest at 10 years” sentence was not found and this number is inferred from that shared floor.
DROP
No DROP program appears in the MTRS pages reviewed. Two related PDFs (ch71ssv1.pdf, dros.pdf) could not be text-extracted this session, so this is an absence-of-evidence finding against the pages that could be read, not a full document-by-document denial.
DROP is rarer than it appears across the systems on this site: most have none.
What could not be verified
REFUND TERMS: this page does not state what happens to your contributions if you take a refund instead of leaving your account with the system: that comparison was not independently researched for this system this session, and is left as an open gap rather than guessed from another system’s rule. Consult your own plan’s refund/forfeiture terms before deciding. Any additional field marked “not stated” in the verdicts table above was genuinely absent from the official materials read, not omitted for space.
Sources
- MTRS creditable service
- MTRS membership tier chart
- MTRS pre-retirement issues
- MTRS FY2027 COLA approved
Read September 3, 2026.
Related public pension systems: Minnesota PERA · Minnesota TRA.
General information drawn from each system’s own official published materials, not legal, tax or financial advice. Vesting, COLA and buyback rules are set by state statute and plan tier, differ materially by hire date, and can change by future legislation. This page cannot see your own member statement, which governs. We are not a law firm, a tax adviser, or a fiduciary, and this is not personalized advice.