Updated September 3, 2026. Quick answer: Wisconsin Retirement System (WRS): instead of a conventional COLA, WRS recalculates an annuity adjustment every year that can be positive OR negative, floored so the Core annuity never drops below its guaranteed base, service credit can be purchased, and no DROP was found. Vesting takes five years of WRS 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? | Variable annuity adjustment: can be negative |
|---|---|
| Is the COLA compounded? | Effectively yes, within a protected floor |
| Vesting | 5 years of WRS creditable service |
| Buy service credit? | Yes |
| DROP? | None found |
| State | Wisconsin |
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
WRS does not run a conventional fixed-percentage COLA. Instead: “Your Core annuity is guaranteed for your lifetime and, by law, will never go below the Core (“floor”) (lowest payment limit).” “Payments may increase or decrease based on Core Trust Fund and Variable Trust Fund investment returns.” “Annuity adjustment rates are based on an assumed 5% effective rate of interest. They may be higher or lower, depending on whether actual fund performance is above or below 5%.” This is not a hypothetical: an ETF announcement on record shows a real year with “Core: 0% (no change) Variable: -10% (decrease).” Because a negative adjustment reduces the same balance a positive one grew, this functions as compounding on the current annuity within the protected Core floor, though ETF’s page does not use the word “compound” to describe it.
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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Buying service credit
WRS lets members buy back “Forfeited Service” (after returning to WRS-covered employment for at least 3 complete, consecutive earnings periods), “Qualifying Service” (for members who began WRS service before 1973 as non-teachers), and “Other Governmental Service” (OGS) from federal, state, or local public employment including military time. “OGS calculations are based on several factors, including your age, years of WRS service and earnings, employment category and retirement date”; an online calculator gives unofficial forfeited-service estimates, with the official cost available only by contacting ETF directly.
Run your own numbers before deciding: some purchases never recover their cost, and the calculator shows which.
Vesting
For employees starting July 1, 2011 or later: “you must have 5 years of WRS creditable service,” where a year is earned by hours worked: “teachers need to work 1,320 hours and all other employees need to work 1,904 hours” to earn one year of service.
DROP
No DROP program was found on etf.wi.gov. WRS instead runs the annuity-adjustment mechanism above, plus a separate Wisconsin Deferred Compensation Program: a 457(b) savings plan, not a DROP.
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
- WRS how the retirement benefit works
- WRS buying creditable service
- WRS annuity payments and adjustments
Read September 3, 2026.
Related public pension systems: New Mexico PERA · New Mexico ERB.
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.