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Marital Share of a Pension in an Illinois Divorce: the facts

2026 law · reviewed September 7, 2026

  1. Pension benefits acquired by or participated in by either spouse after the marriage and before the judgment are presumed marital property, whatever the plan and whoever earned them (750 ILCS 5/503(b)(2)).
  2. Illinois courts divide a defined-benefit pension one of two ways, both approved in In re Marriage of Hunt, 78 Ill. App. 3d 653 (1979): an immediate offset of its present value against other property, or reserved jurisdiction, under which the former spouse takes a share of each benefit check when it is paid.
  3. Under reserved jurisdiction the marital portion of each check is the coverture fraction: months of plan participation during the marriage over total months of participation at retirement. The former spouse customarily takes half the marital portion; the share is negotiable.
  4. Example: five years in the plan before the wedding, fifteen married, ten more until retirement, a $4,000 monthly pension. The fraction is 15/30, so $2,000 of each check is marital and the former spouse receives $1,000. Frozen at the divorce instead, on the $2,200 earned by then, the share would be $825.
  5. The fraction is applied to the benefit as actually paid at retirement, post-divorce raises and service included; the growing denominator, not a frozen benefit, is what protects the employee spouse (In re Marriage of Richardson, 381 Ill. App. 3d 47 (2008)).
  6. A public pension (SERS, SURS, TRS, IMRF, the Chicago funds) is divided only by a QILDRO under 40 ILCS 5/1-119, which needs the member's written consent if the member joined on or before July 1, 1999; a private plan by a QDRO under ERISA § 206(d)(3) and IRC § 414(p). The decree alone moves nothing.

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