If you enter into a civil union in Illinois and your relationship later ends, your civil union must be dissolved by a state court in order to end your legal relationship with your civil union partner. If you and/or your partner move to another state after entering into a civil union in Illinois, the courts of that state may dissolve your civil union. If your civil union cannot be dissolved by the courts in the state of your residence, your civil union can be dissolved by an Illinois state court. The dissolution of civil unions follows the same procedures and is subject to the same rights and obligations that are involved in the dissolution of marriages.
Illinois law will dissolve your civil union if you either establish grounds for dissolving the civil union or if you and your partner have lived apart for at least two years and can establish that your civil union must be dissolved due to irreconcilable differences. If both you and your partner attest to the court that your civil union needs to be dissolved due to irreconcilable differences, the court may only require you to have lived apart for a period of six months in order to dissolve the civil union.
If you do not dissolve your civil union when your relationship ends, your legal relationship with you civil union partner will continue. You and your partner will continue to have certain legal responsibilities to each other and neither of you can enter into a marriage or another civil union or substantially similar legal relationship until the civil union is dissolved.