Bottom line

No — your Illinois TRS tier is fixed by the date you first contributed to the system, and there is no application, election, or buy-in process to move a Tier 2 member into Tier 1. The one thing that can change your assignment is qualifying pre-2011 reciprocal service, which is a fact about your history, not a request you file.

Key facts

  • Tier 1: first contributed to TRS before January 1, 2011
  • Tier 2: first contributed on or after January 1, 2011, with no qualifying prior reciprocal service
  • Tier assignment is set by statute — there's no personal election to switch

Why people ask this at all

Tier 2 benefits are noticeably less generous than Tier 1's on several fronts — a higher normal retirement age, a lower pensionable salary cap, and no automatic 3% compounding COLA — which is exactly why the question comes up so often among newer teachers. It's a reasonable thing to want to change. It's just not something TRS offers as an option.

What actually decides your tier

TRS Illinois sets the line at January 1, 2011. If you first contributed to TRS before that date, you're Tier 1. If you first contributed on or after that date, you're Tier 2 — unless you had qualifying, pre-existing creditable service with a reciprocal Illinois pension system (such as certain other public retirement systems in the state) from before January 1, 2011, in which case that earlier reciprocal service can carry your Tier 1 status forward even though your TRS contributions started later.

That reciprocal-service exception is the only mechanism that changes the outcome, and it depends entirely on a fact that already exists in your work history — it isn't something you request or apply for after the fact if it doesn't already apply.

What isn't available

There is no buy-in, upgrade purchase, or application process that lets a Tier 2 member elect Tier 1 status by paying an additional cost — unlike, say, an inter-tier upgrade some other Illinois pension programs have offered for specific narrow situations in the past. If you're a Tier 2 member because you first contributed on or after January 1, 2011 with no qualifying reciprocal service, that assignment doesn't change through anything you do at TRS.

If you believe you may have qualifying pre-2011 reciprocal service that hasn't been credited correctly, that's a records question worth raising directly with TRS — it's a correction to an existing fact, not a request to switch tiers as a matter of preference.

Sources for this sectionIllinois TRS — Tier II ↗

What Tier 2 members can do instead

Since an election into Tier 1 isn't available, Tier 2 members focused on improving their retirement outlook generally look at what is within their control: maximizing creditable service, understanding the Tier 2 salary cap and how it's adjusted, and, where offered, considering supplemental savings options such as TRS's Supplemental Savings Plan to build additional retirement income alongside the pension.

Sources for this sectionIllinois TRS — Tier II ↗

Before you act on this

  1. Confirm your exact first-contribution date with TRS.
  2. Check whether you have any pre-2011 service with a reciprocal Illinois pension system.
  3. If you believe your tier is misclassified, raise it as a records correction with TRS.
  4. If you're confirmed Tier 2, focus on service credit and supplemental savings rather than a tier switch.

Common questions

Can I pay to upgrade from Tier 2 to Tier 1 in Illinois TRS?

No. There's no buy-in, purchase, or election process that moves a Tier 2 member into Tier 1 status.

What determines whether I'm Tier 1 or Tier 2?

The date you first contributed to TRS. Before January 1, 2011 is Tier 1; on or after that date is Tier 2, unless you had qualifying pre-2011 reciprocal service.

I have service with another Illinois public pension system from before 2011 — does that make me Tier 1?

It can, if it qualifies as reciprocal creditable service under TRS rules. That's a records question worth confirming directly with TRS rather than assuming either way.

Sources for this page

Sources were reviewed on September 11, 2026. Rules and member records maintained by the retirement system control.

Illinois TRS — Tier IOfficial source ↗Illinois TRS — Tier IIOfficial source ↗
Important

General educational information only — this is not a formal benefit determination, nor financial, tax, or legal advice. Verify anything account-specific with the retirement system itself.