We are thrilled to confirm that Phoenix is going live next week, April 14–18! This marks a major milestone in our modernization journey, and we can’t wait for you to begin using the new system.

What to Expect the Week of Go-Live

• Most HR/payroll representatives will automatically migrate to Phoenix and will receive an email from MOSERS on or around April 14 with instructions on how to log in.
• Please log in as soon as possible during the first week to ensure your access is working before payroll reporting begins.
• A small number of HR/payroll reps will receive their login email later in the week as we finalize their organizational access and reporting group assignments. We will reach out directly to these employers if additional verification is needed.

Action Required for SAM II Employers

If you have non-benefit-eligible employees listed as 50% FTE or more in SAM II, you must take action to avoid payroll errors in Phoenix and potential retirement contribution withholding for non-benefit-eligible employees.

• Option 1 (preferred): Update the non-benefit-eligible employee’s FTE to 49% or less in SAM II.
• Option 2: If the non-benefit-eligible employee's FTE must remain at 50% or more, email us at employers@mosers.org so we can add them to the Upload Override Table in Phoenix.

SEBES Downtime This Weekend

The MOSERS portion of SEBES will be unavailable starting the evening of Friday, April 11, through Sunday, April 13. Please make sure to inform new employees of this downtime so they can plan accordingly when completing their benefit elections. During this time, SEBES will remain available for employees to enroll in other eligible benefits.

Training Materials Available in Phoenix

Training videos and reference materials will be available inside the Phoenix Employer Login. These will help guide you through common tasks and ensure you're set up for success.

Payroll Reporting Reminders

• Every time you pay your employees, you must submit your reporting group(s) payroll report in Phoenix.
• SAM II Employers: Follow the SAM II Payroll Reporting Calendar in Phoenix to meet deadlines and avoid disruptions.
• Local Employers: You cannot upload your next payroll file into Phoenix until the payroll report for the prior pay period has been submitted. For help with timing, refer to the Local Payroll Cycles in Phoenix flyer.

Post Go-Live Office Hours – Coming Soon

To support a smooth transition after Phoenix goes live, MOSERS will begin offering online office hours starting the week of April 21. These sessions will provide real-time support and an opportunity to ask questions. We will alternate between sessions geared toward SAM II and Local employers. The schedule and format will be announced next week.

Change to ESS for SAM II Employees

Please share the following with your team members:

The single sign-on option in the Employer Self-Service (ESS) portal at ess.mo.gov will no longer be available. If you have historically accessed myMOSERS through ESS, you will need to set up your login credentials the first time you log in at mymosers.mosers.org on or AFTER April 14, 2025. The ESS portal will have a link to myMOSERS that will direct you to the MOSERS website. See the ESS Login Flyer for directions.

IMPORTANT: The myMOSERS site will be unavailable from 4:30 p.m. on April 11 until 8 a.m. on April 14, as we update our system.

We're almost there! Thank you for your continued partnership and preparation as we enter this exciting new chapter with Phoenix.

Questions? Reach out anytime to employers@mosers.org or call (800) 827-1063, option 2.