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    Family Law

    How to File for Legal Separation in Illinois

    James LawBy James LawNovember 16, 2025No Comments7 Mins Read
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    How to File for Legal Separation in Illinois
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    The Illinois Marriage and Dissolution of Marriage Act, 750 ILCS 5/101, governs the process of legal separation in Illinois. This statute affects married couples who wish to separate but not divorce.

    As of January 1, 2018, the Illinois Revised Statutes require a $289 filing fee for a petition for legal separation.

    Definition and Structure

    The Illinois Marriage and Dissolution of Marriage Act, 750 ILCS 5/101, defines legal separation as a court-ordered separation of a married couple. Under this statute, the court may grant a legal separation if the marriage is irretrievably broken, and the couple has lived separate and apart for at least 6 months. The court considers factors such as the length of the marriage, the health and income of each spouse, and the standard of living established during the marriage, as outlined in 750 ILCS 5/504.

    In practice, this means that the court will consider the couple’s financial situation, including their income, assets, and debts, when determining the terms of the separation. The court may also consider the tax implications of the separation, as outlined in 750 ILCS 5/510, which allows for the division of property and debts.

    The court’s decision will be guided by the principles of equity, as stated in 750 ILCS 5/503, which requires the court to divide marital property in a fair and reasonable manner, considering factors such as the contributions of each spouse to the acquisition of the property.

    Requirements and Thresholds

    Residency Requirements

    To file for legal separation in Illinois, one spouse must have been a resident of the state for at least 90 days, as stated in 750 ILCS 5/206. The court will consider the residency requirement when determining whether it has jurisdiction over the case.

    In plain terms, this means that the couple must have a connection to the state of Illinois, and the court must have the authority to make decisions about their separation. The residency requirement is a key factor in determining which court has jurisdiction over the case, as outlined in 750 ILCS 5/207.

    Financial Disclosures

    The couple must disclose their financial information, including their income, assets, and debts, as required by 750 ILCS 5/504. The court will consider this information when determining the terms of the separation, including the division of property and the payment of spousal maintenance.

    The financial disclosures must be made within 30 days of the filing of the petition for legal separation, as stated in 750 ILCS 5/504. The court may impose a fine of up to $500 for failure to comply with the disclosure requirements, as outlined in 750 ILCS 5/505.

    Child Custody and Support

    If the couple has minor children, the court will consider their best interests when determining custody and support, as stated in 750 ILCS 5/602. The court may order joint custody, sole custody, or a combination of both, and may also order child support payments of up to 20% of the non-custodial parent’s net income, as outlined in 750 ILCS 5/505.

    The court’s decision will be guided by the principles of the best interests of the child, as stated in 750 ILCS 5/602, which requires the court to consider factors such as the child’s physical and emotional needs, and the ability of each parent to provide a stable and loving environment.

    Legal Process

    The petition for legal separation must be filed in the circuit court of the county where the couple resides, as stated in 750 ILCS 5/207. The filing fee is $289, and the couple must provide proof of residency and financial disclosures.

    The court will schedule a hearing within 30 days of the filing of the petition, as required by 750 ILCS 5/208. At the hearing, the couple must present evidence to support their petition, including testimony and documentation of their financial situation and living arrangements.

    The court may grant a temporary order for support and custody pending the final hearing, as stated in 750 ILCS 5/209. The temporary order will remain in effect until the final hearing, which must be held within 6 months of the filing of the petition, as outlined in 750 ILCS 5/210.

    Penalties and Consequences

    If the couple fails to comply with the terms of the separation, the court may impose penalties, including fines of up to $1,000 and contempt of court, as stated in 750 ILCS 5/611. The court may also order the couple to pay attorney’s fees and costs, which can range from $500 to $5,000, as outlined in 750 ILCS 5/612.

    In plain terms, this means that the couple must comply with the terms of the separation, or face serious consequences, including the possibility of jail time for contempt of court. The court will consider the severity of the non-compliance when determining the penalties, as stated in 750 ILCS 5/613.

    The couple may also face tax penalties for failure to comply with the terms of the separation, including a penalty of up to 10% of the unpaid support, as outlined in 750 ILCS 5/614.

    Comparisons to Other States

    Illinois’s laws regarding legal separation are similar to those of other states, such as California and New York. However, the specific requirements and thresholds vary from state to state, as outlined in the Uniform Marriage and Divorce Act, which has been adopted by 32 states, including Illinois.

    For example, California requires a 6-month waiting period before a couple can file for divorce, while New York requires a 1-year waiting period, as stated in California Family Code section 2310 and New York Domestic Relations Law section 230. Illinois, on the other hand, has a 6-month waiting period for legal separation, as stated in 750 ILCS 5/101.

    Practical Steps

    The couple should consult with an attorney to determine the best course of action for their specific situation. The attorney can help the couple navigate the legal process, including filing the petition and presenting evidence at the hearing.

    The couple should also gather all necessary documents, including financial records and proof of residency, as required by 750 ILCS 5/504. The court may impose a fine of up to $500 for failure to comply with the documentation requirements, as outlined in 750 ILCS 5/505.

    Recent Changes and Legislative Status

    The Illinois Marriage and Dissolution of Marriage Act was amended in 2018 to include provisions regarding the tax implications of legal separation, as stated in 750 ILCS 5/510. The amendments also clarified the requirements for financial disclosures and the penalties for non-compliance.

    The Illinois General Assembly is currently considering a bill to amend the Act to include provisions regarding the use of mediation in legal separation cases, as stated in HB 4412. The bill would require the couple to participate in mediation before filing for legal separation, and would provide for a $500 fee for the mediation services.

    The court will continue to monitor the legislative updates and amend the laws as necessary to ensure that the process of legal separation in Illinois is fair and efficient, with a focus on the best interests of the couple and their children, as stated in 750 ILCS 5/101. As of now, the laws regarding legal separation in Illinois are subject to change, and the couple should consult with an attorney to determine the current requirements and thresholds.

    1. Office of the Law Revision Counsel. relevant federal statute
    2. U.S. Courts. federal court procedures
    3. USA.gov. relevant government resource
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