To file a legal separation in Missouri, one spouse must have lived in the state for at least 90 days, then file a petition in the circuit court where either spouse resides, serve the other spouse, and either reach a written settlement or ask a judge to decide the contested issues. The court cannot enter a final judgment until at least 30 days after the petition is filed.1Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.305 – Judgment of Dissolution, Grounds for Legal Separation You stay married at the end of it, but a court order governs your property, debts, custody, support, and living arrangements.
Who Can File and on What Grounds
At least one spouse must have been a Missouri resident for 90 consecutive days immediately before filing. Military members stationed in Missouri for that same 90-day stretch qualify too, even if their legal residence is elsewhere.1Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.305 – Judgment of Dissolution, Grounds for Legal Separation
The grounds are where separation splits from divorce. A divorce petition alleges the marriage is irretrievably broken. A legal separation petition alleges the opposite: that there remains a reasonable likelihood the marriage can be preserved. The judge has to agree with that finding before entering a separation judgment.2Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.310 – Petition, Contents If both of you tell the court the marriage is beyond repair, expect the case to be steered toward dissolution instead.
What You File
The case starts with a petition in circuit court. Some counties use a form titled “Petition for Legal Separation” or “Petition for Separate Maintenance”; others adapt the standard dissolution petition. Whichever form you use, state clearly that you want legal separation, not divorce.
Missouri law requires the petition to include:
- The county and length of Missouri residence for each spouse.
- The date and place the marriage was registered, and the date you separated.
- The name, age, and address of each child, and which parent each child has primarily lived with during the 60 days before filing.
- Whether the wife is currently pregnant.
- The last four digits of each spouse’s and each child’s Social Security number.
- Any existing or proposed arrangements for custody, child support, and spousal maintenance.
- A statement of the relief you are asking the court to order.
These items come from the statute governing petition contents.2Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.310 – Petition, Contents
Financial Disclosures
You also prepare a Statement of Property and Debt listing what you and your spouse own and owe: real estate, bank accounts, vehicles, investments, retirement accounts, mortgages, and credit card balances. A Statement of Income and Expenses breaks down each spouse’s earnings and monthly living costs. The court needs both to divide property and set support.
Parenting Plan
If you have minor children, file a proposed parenting plan that covers physical custody, legal custody (who makes major decisions about education and healthcare), and a detailed schedule for parenting time. Many Missouri circuits also require both parents to complete a court-approved parenting education class before a final hearing. Your local circuit clerk can tell you what your county requires, which programs it accepts, and the deadlines and fees, because those vary.
Where to File, Fees, and Serving Your Spouse
File your petition and supporting documents at the circuit court in the county where either spouse lives.3Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.300 – Procedure and Venue Filing fees vary by county; ask the clerk’s office for the current amount.
Your spouse then has to be formally notified. The simplest route is a signed Entry of Appearance and Waiver of Service, in which the responding spouse acknowledges the case and agrees to participate without a process server. If that is not on the table, arrange service through the county sheriff or a private process server who physically hands your spouse the petition. Nothing else in the case can move forward until service is done.
The 30-Day Response Window
Once served, the responding spouse has 30 days to file an Answer responding to each claim and raising their own positions on property, custody, and support. Skipping the response does not shut the case down. The petitioner can ask for a default judgment, and the judge could approve the petition’s terms without further input from the other spouse.
Temporary Orders While the Case Is Pending
These cases can take months, and life keeps moving. Either spouse can ask the court for temporary orders on child custody, child support, and spousal maintenance while the case is pending. The request must include an affidavit explaining the facts and the amounts you need.4Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.315 – Temporary Orders, Restraining Orders
The court can also issue restraining orders during this period. Common ones stop either spouse from hiding, selling, or wasting marital assets, or keep one spouse away from the other if there is a risk of harm. In serious situations, a judge can exclude a spouse from the family home. Temporary orders stay in effect until the final judgment.4Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.315 – Temporary Orders, Restraining Orders
Settling or Going to a Hearing
Missouri lets spouses write their own deal. Under the statute, you and your spouse may enter a written separation agreement covering spousal maintenance, property division, and custody.5Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.325 – Separation Agreements Authorized The property and maintenance terms bind the court unless the judge finds them unconscionable. If the judge does find the deal fundamentally unfair, the court can send you back to revise it or write its own orders.
When you agree on everything and the judge approves, the terms are incorporated into the Judgment of Legal Separation.5Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.325 – Separation Agreements Authorized If you cannot agree, the case goes to a hearing where the judge decides every contested issue.
Either way, the 30-day floor applies. No matter how quickly you reach a deal, the court cannot enter a final judgment until at least 30 days after the petition was filed.1Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.305 – Judgment of Dissolution, Grounds for Legal Separation
What the Decree Changes
Once the judgment is entered, anything you acquire afterward is your separate property, not marital property.6Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.330 – Disposition of Property and Debts Future earnings, purchases, and investments belong to the spouse who acquired them. New debts are generally yours alone.
The property division inside the judgment itself is final and cannot be modified later.7Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360 – Conversion of Legal Separation to Dissolution That is worth thinking hard about before you sign an agreement. Child support and custody can be revisited as circumstances change; the property split is locked.
Your tax filing status also changes. The IRS treats a spouse with a court decree of legal separation as unmarried, which means single or, if you qualify, head of household. You cannot file jointly.8Internal Revenue Service. Filing Taxes After Divorce or Separation Physical separation without a decree does not do this; the IRS still considers you married no matter how long you have lived apart.
Health insurance is one reason couples pick separation instead of divorce. Because you are still married, some employer plans keep covering a legally separated spouse, and Missouri law provides a continuation of coverage option for legally separated spouses under group health plans. That right ends when the separated spouse turns 65, remarries and gains coverage under a new plan, or becomes covered by another group plan.9Missouri Revisor of Statutes. Missouri Revised Statutes 376.894 – Continuation of Coverage Confirm the details with the plan administrator, because employer policies vary.
Converting or Undoing the Separation Later
Legal separation is not a one-way door. No earlier than 90 days after the judgment is entered, either spouse can file a motion asking the court to convert it into a dissolution of marriage.7Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360 – Conversion of Legal Separation to Dissolution Only one spouse has to want the conversion; the other need not agree. The court treats it as a new proceeding, so proper notice is required.
If you both want to end the separation and resume the marriage, you can file a joint motion, and the court will set the judgment aside.7Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360 – Conversion of Legal Separation to Dissolution That flexibility is the practical reason many couples choose separation first: reconciliation stays possible without a new legal process, and divorce stays available if the separation does not resolve things.