KPERS 1: Hired before July 1, 2009
KPERS 2: Hired July 1, 2009 - December 31, 2014
KPERS 3: Hired January 1, 2015 and after
Your group is important because it affects benefit rules. You have 3 ways to figure out which group you belong to.
Unless you have a special scenario, like leaving and coming back in your work history, your original hire date decides your KPERS group.
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If you aren't sure or have any questions ask your employer or contact KPERS.