Missouri Child Support Laws (2026): Guidelines & Calculator

Missouri calculates child support using the Income Shares Model and Form 14, a standardized worksheet governed by RSMo 452.340 and Missouri Supreme Court Rule 88.01. Courts combine both parents' gross monthly income, look up the basic obligation by number of children, then split the amount proportionally between parents. Use the Missouri child support calculator below to estimate a guideline amount, or open the full-page Missouri child support calculator to run a detailed estimate.

How to Apply for Child Support in Missouri

The Missouri Department of Social Services manages child support cases through its Family Support Division (FSD). The FSD helps parents locate noncustodial parents, establish paternity, and start or enforce child support and medical support orders.

To apply for child support services, you can:

• Submit the CS-300EZ Application for Child Support Services online through the state forms portal
• Download and print the paper child support application and mail it to the Family Support Division, PO Box 6790, Jefferson City, MO 65102
• Visit your nearest Family Support Division office to get an application in person

The application takes approximately 30 minutes to over an hour to complete, depending on your situation. After submission, you will receive a letter confirming your case number and providing contact information for your assigned caseworker.

For assistance with your application, call 1-855-373-4636 or visit your local Resource Center.

Important Application Details

Several key points apply when you file for child support in Missouri:

• A $35 annual fee applies once the state has collected at least $550 of support during a federal fiscal year (October 1 through September 30) for a family that has never received TANF assistance. Under 42 U.S.C. 654(6)(B)(ii) the fee is charged to the parent receiving services and is normally retained by the state out of support collected on that parent's behalf, but not out of the first $550 collected
• You will need your Social Security number, current addresses, court order information, and other relevant documents
• If paternity has not been established, do not sign any acknowledgment forms until a determination is made

Establishing Paternity in Missouri

Missouri maintains a Putative Father Registry under RSMo 192.016. This registry allows a man who believes he may be the biological father of a child born out of wedlock to file a "Notice of Intent to Claim Paternity." The notice must be notarized and mailed to the registry, which is operated by the Bureau of Vital Records within the Missouri Department of Health and Senior Services.

The Putative Father Registry serves several purposes:

• It helps state agencies locate parents for child support enforcement
• It prevents adoption of the child without the father's knowledge or consent
• It establishes a record that can support a future paternity claim

Paternity can also be established voluntarily by signing an Affidavit Acknowledging Paternity at the hospital when the child is born. If paternity is disputed, the FSD or a court can order genetic testing to resolve the question.

How Child Support Is Calculated in Missouri

Missouri uses the Income Shares Model to calculate child support. Under RSMo 452.340 and Missouri Supreme Court Rule 88.01, courts determine support obligations using Form 14, a standardized worksheet that accounts for the financial circumstances of both parents.

The Missouri Supreme Court issued an updated Form 14 on March 4, 2025, with an effective date of January 1, 2026. This revision includes an updated Schedule of Basic Child Support Obligations reflecting current economic data.

Step-by-Step Form 14 Calculation

The Form 14 worksheet follows these steps:

1. Determine each parent's monthly gross income. This includes wages, salaries, commissions, bonuses, Social Security benefits, pensions, disability payments, unemployment compensation, and other regular income sources. The worksheet uses one-twelfth of each parent's annual gross income.
2. Combine both parents' monthly gross incomes. The combined total determines where the family falls on the Schedule of Basic Child Support Obligations.
3. Look up the basic child support obligation. The schedule provides a dollar amount based on the combined income and the number of children.
4. Calculate each parent's proportionate share. Each parent's individual income is divided by the combined income to determine their percentage share of the obligation.
5. Add adjustments for additional expenses. Health insurance premiums for the children, work-related childcare costs, and extraordinary expenses are factored in.
6. Apply custody-related credits. If the noncustodial parent has significant overnight parenting time, adjustments may reduce the obligation.

The resulting amount represents the presumed correct child support obligation under Missouri law.

Factors the Court Considers

Under RSMo 452.340, the court evaluates several factors when setting child support:

• The financial needs and resources of the child
• The financial resources and needs of both parents
• The standard of living the child would have enjoyed if the parents had not separated
• The physical and emotional condition of the child, including educational needs
• Custody arrangements and the amount of time the child spends with each parent
• Reasonable work-related childcare expenses of either parent

Joint Custody Adjustment

Missouri law specifically addresses shared parenting situations. Under RSMo 452.340.11, when parents share joint physical custody and the child spends substantially equal time with both parents, the court may reduce the basic child support obligation by up to 50%. This adjustment recognizes that both parents bear direct costs of raising the child during their parenting time.

Rebuttable Presumption

The amount calculated through Form 14 carries a rebuttable presumption of correctness. This means the court presumes the guideline amount is the right amount to order. However, either parent can argue that the presumed amount would be unjust or inappropriate given the specific circumstances of the case. If the court agrees and deviates from the guidelines, it must document the reasons with specific written findings.

How to Modify Child Support in Missouri

Missouri law recognizes that financial circumstances and children's needs change over time. Under RSMo 452.370, either parent may petition the court to modify an existing child support order.

The 20% Rule

Missouri uses a straightforward threshold to determine whether modification is warranted. If applying the current Form 14 guidelines to the parties' present financial circumstances produces an amount that differs from the existing order by 20% or more, a prima facie case for modification exists. This means the court will presume the existing terms are unreasonable and should be changed.

This 20% rule applies only when the original order was based on the presumed guideline amount from Form 14. If the original order resulted from a deviation or a stipulated agreement between the parties, the standard "substantial and continuing change" test applies instead.

Grounds for Modification

Beyond the 20% threshold, courts consider other substantial and continuing changes, including:

• A significant increase or decrease in either parent's income
• Job loss, serious illness, or disability affecting earning capacity
• Changes in custody or parenting time arrangements
• Significant changes in childcare or medical expenses
• The child's changing needs as they grow older

Important Modification Rules

Several rules apply to the modification process:

• A stepparent's income is not treated as parental income in the calculation
• Remarriage by itself does not justify modifying child support
• The court considers all financial resources of both parties, including expenses shared by a cohabiting partner
• Modifications can be pursued through the Family Support Division, by agreement between the parties, or through a court petition
• Modifications reach back only to the date of personal service on the other parent, not the filing date. RSMo 452.370.6 provides that an order "may be modified only as to support or maintenance installments which accrued subsequent to the date of personal service," so every week of delay in getting the other parent served costs the moving parent the installments that accrue in the meantime

Enforcement and Penalties for Non-Payment

The Missouri Family Support Division enforces child support orders using a range of administrative and legal tools. Enforcement actions are authorized under RSMo Chapter 454 (Enforcement of Support Law).

Administrative Enforcement Tools

The FSD can take the following actions without going to court:

• Income withholding: Employers must withhold child support directly from the noncustodial parent's wages and forward it to the state disbursement unit
• Tax refund intercept: Federal and state tax refunds can be seized and applied to arrears
• Unemployment benefits intercept: Unemployment compensation payments can be redirected to satisfy child support obligations
• Lottery winnings intercept: Missouri lottery winnings above a certain threshold may be intercepted
• Property liens: The FSD can place liens on real and personal property to secure unpaid support
• Financial account seizure: Bank accounts and other financial assets may be frozen and seized
• Credit bureau reporting: Delinquent child support is reported to credit agencies, affecting the obligor's credit score and ability to obtain loans, mortgages, and certain employment
• License suspension: Missouri can suspend or revoke driver's licenses, professional licenses, and recreational licenses for nonpayment
• Insurance claim intercept: Certain insurance settlements or claims may be intercepted

Passport Denial

Under federal law (42 U.S.C. 652(k)), if a parent owes arrears exceeding $2,500, the Secretary of State "shall" refuse to issue a passport to that individual. Denial of a new passport is mandatory once the case is certified. Action against a passport the parent already holds is discretionary: the statute says the Secretary of State "may revoke, restrict, or limit a passport issued previously." State child support enforcement agencies certify qualifying cases to the federal Office of Child Support Services (renamed from the Office of Child Support Enforcement in 2023), which forwards them to the State Department for inclusion in its lookout database.

Criminal Penalties in Missouri

Under RSMo 568.040, a parent commits the offense of criminal nonsupport by knowingly failing to provide adequate support that the parent is legally obligated to provide for a child or stepchild who is not otherwise emancipated.

Criminal nonsupport carries the following penalties:

• Class A misdemeanor: Up to 1 year in jail and a fine up to $2,000 for general nonpayment
• Class E felony: If total arrears exceed an aggregate of 12 monthly payments, the offense escalates to a felony punishable by up to 4 years in prison and a fine up to $10,000

If a convicted offender is placed on probation or parole, the court may require payment of current support and satisfaction of arrears as a condition. Arrears may be satisfied through a lump sum payment based on the offender's financial resources, followed by periodic payments.

Contempt of Court

A custodial parent or the FSD can file a motion for contempt if the obligor willfully fails to comply with a court order. If found in contempt, the noncustodial parent must appear in court to explain the circumstances. Possible outcomes include:

• A new payment arrangement or modification of the order
• A structured payment plan for accumulated arrears
• Jail time if the court finds the failure to pay was willful and without justification

Statute of Limitations on Arrears

Under RSMo 516.350, each periodic child support payment is presumed paid and satisfied 10 years after that payment becomes due, unless the judgment has been formally revived before that deadline. This means older individual payments can become uncollectible even if the overall order remains active. To preserve the right to collect, a judgment creditor must revive the order through proper legal process, which restarts the 10-year clock from the revival date.

For establishing paternity, the time limit is the child's 18th birthday if a parent is petitioning, or the child's 21st birthday if the child petitions on their own behalf.

Arrearage Forgiveness

Each child support installment becomes a vested judgment on the day it comes due, and a court cannot wipe it out by modifying the order later. Under RSMo 452.370.6, an order "may be modified only as to support or maintenance installments which accrued subsequent to the date of personal service." A modification can lower or end what accrues going forward, but it cannot retroactively erase what has already accrued.

When Does Child Support End in Missouri?

Under RSMo 452.340.3, the obligation to pay child support ends when one of the following events occurs, "unless the circumstances of the child manifestly dictate otherwise and the court specifically so provides":

• The child dies
• The child marries
• The child enters active military duty
• The child becomes self-supporting, with the custodial parent's express or implied consent to relinquish parental control
• The child reaches age 18 (unless the child is still enrolled in school or subsection 4 applies)
• The child reaches age 21, unless the order specifically extends support past 21 for the reasons in RSMo 452.340.4

Termination Is Not Self-Executing (Except at 21)

Only the age-21 event ends the obligation on its own. Under RSMo 452.340.12(1), where the state case registry or the order contains the child's date of birth, the obligation "shall be deemed terminated without further judicial or administrative process when the child reaches age twenty-one," provided the order does not require payments beyond that age.

Every other event on the list runs through a paperwork step in RSMo 452.340.12(2) through (4):

• The parent receiving support can end it by furnishing a sworn statement or affidavit notifying the obligor of the child's emancipation, in accordance with RSMo 452.370.4, and filing a copy with the court that entered the order (or with the Family Support Division for an administrative order)
• The parent paying support can file a sworn statement or affidavit with that court or the division reciting the factual basis for emancipation. It is served on the other parent and takes effect if that parent affirms it in writing or does not respond within 30 days
• If the other parent responds and disputes it, the court or division decides the question

A paying parent who simply stops paying when a child marries or becomes self-supporting, without going through this process, keeps accruing arrears on paper. Those installments vest as they come due, so the safe course is to file the affidavit rather than to stop unilaterally.

Support for an Incapacitated Adult Child

Age 21 is not a hard ceiling. Under RSMo 452.340.4, "if the child is physically or mentally incapacitated from supporting himself and insolvent and unmarried, the court may extend the parental support obligation past the child's eighteenth birthday." Read together with RSMo 452.340.3(6), an order may run past the child's 21st birthday when it specifically extends support for those reasons. Families of a disabled adult child should raise this explicitly, because the extension has to appear in the order itself.

Extended Support for Education

Missouri extends child support obligations for children who pursue postsecondary education. Under RSMo 452.340, if a child enrolls in an institution of vocational or higher education no later than October 1 following high school graduation, the support obligation continues as long as the child meets these requirements:

• Enrolls in at least 12 credit hours per semester (excluding summer sessions)
• Achieves grades sufficient to allow reenrollment at the institution
• Provides official transcripts or enrollment verification to both parents at the beginning of each semester

Support continues until the child completes their education or reaches age 21, whichever comes first.

Important timing rule: If the child does not enroll in college or vocational school by the October 1 deadline, the support obligation may terminate. However, RSMo 452.340 allows a court to waive the October 1 deadline if the child's circumstances manifestly dictate, so a family that misses the deadline may still be able to seek continued support through a court motion.

Working students can drop to 9 credit hours. RSMo 452.340.5 provides that "a child who is employed at least fifteen hours per week during the semester may take as few as nine credit hours per semester and remain eligible for child support so long as all other requirements of this subsection are complied with." A student holding down a part-time job of 15 hours or more does not lose support by carrying a 9-hour load.

Children with a developmental disability as defined in RSMo 630.005, or with a physical disability or diagnosed health problem that limits their ability to carry the prescribed number of credit hours, may also take fewer than 12 credit hours per semester and still remain eligible, so long as they stay enrolled and attending and meet the subsection's other requirements.

Emancipation in Missouri

Missouri does not have a general statutory emancipation procedure. RSMo 431.056 grants limited contractual capacity, not general emancipation, to a narrow category of minors who meet ALL of the following conditions:

• The minor is 16 or 17 years old
• The minor is homeless or a victim of domestic violence
• The minor is self-supporting, without the physical or financial support of a parent or legal guardian
• The minor's parent or legal guardian has consented to the minor living independently (consent may be expressed or implied)

Under these conditions, the statute allows the minor to contract for housing, employment, medical care, a bank account, and related services. It does not declare the minor emancipated for all purposes, and it does not by itself terminate a parent's child support obligation. A child support obligation ends only when one of the events listed under RSMo 452.340 occurs, such as the child becoming self-supporting with the custodial parent's consent.

Termination of Parental Rights

Missouri courts can terminate parental rights under three circumstances:

• Voluntary termination: A parent surrenders their rights, typically to allow adoption by a stepparent or other person
• Mandatory termination petition: Filed when required by law, such as in cases of severe abuse or abandonment
• Discretionary termination: Filed when a parent is found unfit due to neglect, abuse, or other grounds

The court must find that termination serves the child's best interests before issuing an order. Termination of parental rights does not automatically eliminate past-due child support obligations.

More Missouri Laws

• Missouri Alimony Laws
• Missouri Child Custody Laws
• Missouri Divorce Laws