For high income public employees, federal law limits the amount you can contribute toward retirement and limits the benefit calculation. Table of Contents. Eligibility. Enroll. Contributions.Defined contribution limits for 2023 and 2024. Log in to or sign up for online access to your retirement account. Track your contributions and service credit. Employees can make salary reduction contributions to a SIMPLE IRA plan in any amount up to the legal limits. The single biggest action you can take right now is to sign up for an additional retirement savings plan like DCP. Terms highlighted in bold print appear in the glossary of terms on page 17. How to contact the Department of Retirement Systems.