By the OnPAR Federal Retirement Education editorial team · Last updated

Illinois is one of the friendlier states for a FERS retiree because it lets you subtract your federal pension from state income. We help Chicago-area feds plan by phone or video, and we have no Chicago office.

Federal employers in the area

Benefits contacts

Navy civilians call the Navy Civilian Benefits Center at 1-888-320-2917[2]. For retirees, OPM's number is 1-888-767-6738[3]. Employees of other agencies should start with their agency HR office.

Illinois tax on your FERS annuity

On Form IL-1040, Line 5, Illinois lets you subtract the federally taxed part of a government retirement plan, along with Social Security, qualified plans like 401(k)s, and IRAs[13]. In practice, a FERS annuity and TSP withdrawals that qualify are not taxed by Illinois.

Cost of living

BEA puts the 2024 price level for the Chicago-Naperville-Elgin metro at 103.6, where 100 is the U.S. average[1].

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Sources

  1. BEA: Regional Price Parities by State and Metro Area (2024 data, released Feb 19, 2026)
  2. DoD DCPAS: Benefits Service Centers (official DoD civilian benefits contacts)
  3. OPM: Retirement Services contact
  4. Naval Station Great Lakes: About
  5. Illinois Department of Revenue: Publication 120, Retirement Income

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