Updated September 3, 2026. Quick answer: Teachers’ Retirement System of Oklahoma (TRS): there are no automatic annual COLAs; the Legislature must pass a law for any increase, service credit can be purchased, and no DROP was found: confirmed by a full-text search of the current member handbook for “DROP,” “step-up” and related terms. Vesting takes five years of eligible service for members who joined before November 1, 2017, or seven years for members who joined on or after that date.
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 must enact a law) |
|---|---|
| Is the COLA compounded? | Not stated |
| Vesting | 5 years (hired before 11/1/2017) or 7 years (on/after) |
| Buy service credit? | Yes |
| DROP? | None found |
| State | Oklahoma |
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
“After retirement, there are no automatic yearly cost-of living increases… The Oklahoma Legislature must enact a law to provide for any increase in the retirement benefits.” Whether a specific COLA has been enacted for 2026 was not found in the materials reviewed for this system: the archived TRS handbook and benefit-payments pages describe the general ad hoc process but do not document a specific recent COLA bill or percentage. No fixed statutory cap or compounding rule was found.
Buying service credit
TRS lets members purchase substitute-teaching service (120-day minimum in a school year), higher-education adjunct service (18+ credit hours before joining TRS), military service (180-day minimum), out-of-state service (6 months full-time in one school year), prior non-contributory Oklahoma service, and family or sabbatical leave. For family leave taken during a child’s first year of life, a teacher must notify TRS within 30 days of returning to service that they wish to purchase the leave, then pay the actuarial cost of that period of absence, with up to 12 months from their return to remit payment. A more specific general purchase-cost formula was not found in the current handbook or FAQ pages reviewed.
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
“Members who join TRS prior to November 1, 2017 and have accumulated a minimum of five (5) years of eligible service in the public schools of Oklahoma shall be vested in TRS… Members who join TRS on or after November 1, 2017, will become vested when they have accumulated seven (7) years of eligible service. Contributory service, including redeposit of previously withdrawn service and service transferred from [OPERS], may count towards the years required to vest an account. Unused sick leave and purchased service may not count as vested service except for service credit purchased for adjunct service in Higher Education.”
DROP
A full-text search of the current (2025) official TRS Member Handbook, the benefit-payments page, and the service-credit-purchase page found no mention of a DROP or step-up program: no hits for DROP, Deferred Retirement, step-up, step up, 2.5%, or multiplier in any of the three archived documents reviewed for this system.
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
Read September 3, 2026.
Related public pension systems: Oklahoma OPERS · New Jersey PERS.
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.