In Missouri, the practical difference between legal separation and divorce comes down to one thing: a divorce (which Missouri calls “dissolution of marriage”) permanently ends the marriage and frees both people to remarry, while a legal separation leaves the marriage legally intact even though the court divides property, orders support, and sets custody in essentially the same way. Both proceedings resolve the same issues. What changes is your marital status at the end, and that change ripples into taxes, insurance, inheritance, and Social Security in ways that catch many couples off guard.
What Happens to the Marriage Itself
A dissolution terminates the marital relationship. Once the judgment is entered, you are single. You can remarry. A legal separation does none of that. The court issues binding orders, but you remain married to your spouse, and neither of you can remarry while the separation is in effect.
Because the marriage continues during a legal separation, rights that depend on marital status survive. A legally separated spouse generally retains rights as a surviving spouse under Missouri’s intestate succession laws, so if one spouse dies without a will, the other may still inherit. That right disappears after a dissolution. Life insurance beneficiary designations also stay in place unless the policyholder actively changes them, because the marriage has not ended.
The Legal Standards Are Opposites
Here is something that surprises most people. The legal standard for getting a legal separation is the opposite of the standard for getting a divorce. To grant a dissolution, the court must find “no reasonable likelihood that the marriage can be preserved and that therefore the marriage is irretrievably broken.” To grant a legal separation, the court must find the opposite: that a “reasonable likelihood” of preserving the marriage still exists.1Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.305
Your petition has to reflect that distinction. A dissolution petition alleges the marriage is irretrievably broken. A legal separation petition alleges the opposite, that preservation remains possible.2Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.310 If both spouses swear under oath that the marriage is irretrievably broken, the court generally enters a dissolution. When one spouse disagrees, the spouse seeking dissolution has to prove specific grounds, and the court can delay the hearing for thirty days to six months while suggesting counseling, though it cannot require counseling as a condition of the decree.3Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.320
What the Court Decides in Both Cases
Despite the opposite legal standards for granting them, both proceedings require the court to resolve the same set of issues. From the inside, the cases look nearly identical.
Property and Debts
Missouri follows equitable distribution. The court divides marital property and debts in whatever proportions it considers “just” after weighing the circumstances, which does not mean 50/50.4Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.330 Each spouse keeps their separate (non-marital) property. One point to understand before you choose a legal separation: the property division is final and cannot be modified later, regardless of which type of decree you get.5Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360 Even if you later convert the separation into a divorce, the property division from the original decree stays locked in.
Also worth knowing: a court order assigning a debt to one spouse does not bind the creditor. If both names are on the mortgage or credit card, the lender can still pursue either spouse regardless of what the decree says.
Maintenance
The court can award spousal maintenance in either proceeding, but only if the requesting spouse lacks enough property to meet reasonable needs and cannot support themselves through appropriate employment. Amount and duration turn on earning capacity, the standard of living during the marriage, the length of the marriage, each spouse’s age and health, and conduct during the marriage.6Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.335 The order must state whether it’s modifiable or nonmodifiable, which matters a great deal if circumstances change later.
Children
If you have children, the court establishes a parenting plan based on the child’s best interests7Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.375 and calculates child support under Missouri’s income-based guidelines, with support potentially retroactive to the filing date.8Missouri Revisor of Statutes. Missouri Code 452 – Section 452.340
Why Some Couples Choose Legal Separation
If both proceedings resolve the same issues, why choose the one that leaves you married? A handful of situations make legal separation the better strategic choice.
- Health insurance. Some employer-sponsored plans allow a dependent spouse to remain covered during a legal separation because the marriage has not ended. Divorce almost always ends that coverage. Plans vary, so verify the specific policy terms before filing.
- Religious or personal beliefs. For couples whose faith prohibits divorce, legal separation delivers court-enforceable financial and custody arrangements without formally ending the marriage.
- Social Security spousal benefits. A divorced spouse must have been married at least ten years to claim benefits on an ex-spouse’s earnings record. Legal separation keeps the marriage clock running, which can matter for couples approaching but not yet at ten years.9Social Security Administration. What Are the Marriage Requirements to Receive Social Security Spouse’s Benefits?
- Structured trial period. Legal separation gives couples enforceable support and custody orders while leaving the door open for reconciliation without needing to remarry.
Taxes: Legal Separation Does Not Preserve Joint Filing
This is the most misunderstood consequence of choosing legal separation. The IRS treats a person with a final decree of separate maintenance (which includes Missouri’s legal separation) as unmarried for the entire tax year in which the decree becomes final.10Internal Revenue Service. Publication 504 (2025), Divorced or Separated Individuals A legally separated spouse files as Single or, if they qualify, Head of Household. Not Married Filing Jointly. Not Married Filing Separately.11Internal Revenue Service. Filing Status
Many people assume that because a legal separation preserves the marriage, they can continue filing joint returns and keep the wider tax brackets. They cannot. From the IRS’s perspective, a final decree of legal separation has the same effect on filing status as a divorce. If joint filing is what you’re trying to protect, legal separation will not do it.
Health Insurance and COBRA
Keeping a dependent spouse on an employer health plan is one of the most common reasons for choosing legal separation, but whether it actually works depends entirely on the plan’s terms. Some plans treat a legal separation the same as a divorce and end spousal coverage. Others continue coverage for legally separated spouses. There is no universal rule, so call the plan administrator before filing.
Regardless of what the employer plan does, federal law provides a backstop. Both divorce and legal separation count as qualifying events under COBRA, letting the affected spouse continue coverage under the employer’s group health plan for up to 36 months. COBRA is not subsidized, though. The spouse pays the full premium plus a 2% administrative fee, which can be substantially more than what the employee was paying for dependent coverage. The covered employee or the affected spouse must notify the plan administrator within 60 days of the legal separation or divorce.12Centers for Medicare & Medicaid Services. COBRA Continuation Coverage Questions and Answers Miss that 60-day window and you lose the right to COBRA entirely.
Filing Basics
At least one spouse must have lived in Missouri (or been stationed in the state as a member of the armed services) for a minimum of 90 days immediately before filing. The court cannot enter a final judgment until at least 30 days have passed since the petition was filed, and that cooling-off period is mandatory.1Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.305
You file in the circuit court of the county where you live. The petition requires each spouse’s county of residence and length of time in Missouri, the date and place of marriage, the date of separation, and the names and ages of any children.2Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.310 Filing fees vary by county; St. Louis County, for example, charges $148.50 as of mid-2025, with fee waivers available for people who cannot afford the cost. Attorney fees are separate and typically the larger expense.
Converting a Legal Separation Into a Divorce Later
If you start with a legal separation and later decide you want the marriage ended, Missouri law lets either spouse ask the court to convert it. At least 90 days must pass after the legal separation judgment is entered before anyone can file the motion. The statute uses “may,” which gives the court discretion rather than making conversion automatic.5Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360
Missouri courts have treated a conversion motion as a new and separate legal action, which means the other spouse must receive proper notice and an opportunity to respond. The property division from the original separation stays locked in and cannot be reopened. The court can revisit maintenance and custody if circumstances have changed, but not the property split.5Missouri Revisor of Statutes. Missouri Revised Statutes Section 452.360 So if you enter a legal separation thinking of it as a reversible first step toward divorce, understand that your property decisions on day one are the property decisions you’ll live with permanently.