Missouri uses the Income Shares model — both parents’ gross incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and Missouri child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
12%Arrears Interest
🌾 Missouri Income Shares Model
Missouri Child Support Calculator 2026
Missouri uses the Income Shares model — both parents’ gross incomes are combined.
ℹMissouri uses gross income — Gross = total income before any deductions.
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$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official Missouri income shares formula. Courts may deviate based on special circumstances. Consult a Missouri family law attorney for your specific situation.
🌾 How Missouri Calculates Child Support
ModelIncome Shares — both parents’ combined gross income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest12% annual interest on unpaid arrears
Missouri Key RuleMissouri uses Form 14 — a standardized worksheet for calculating child support
Additional InfoMissouri adjusts for work-related childcare costs and healthcare premiums as add-ons
⚖ 50/50 Custody in Missouri
Does Child Support Apply With 50/50 Custody in Missouri?
In most cases, yes. Missouri does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
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$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a Missouri family law attorney for exact figures.
📋 Missouri Arrears Calculator
Missouri Child Support Arrears Calculator
Calculate total back child support including 12% annual interest Missouri applies to unpaid arrears.
⚠Missouri charges 12% annual interest on all unpaid child support arrears.
$
$
$
Total Arrears Owed (with 12% Interest)
$0
including Missouri 12% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* Missouri applies 12% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
Missouri Child Support Modification
Estimate your new payment and check if you qualify for a modification in Missouri.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
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36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
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Time Since Order
—
* Qualification estimate only. Consult a Missouri family law attorney before filing.
📜 Updated 2026
Missouri Child Support Laws 2026
Key rules, age cutoffs and what you need to know in Missouri.
FORMULA How Missouri Calculates Child Support
Missouri Revised Statutes Section 452.340 governs child support. Missouri uses a standardized Form 14 calculation worksheet based on Income Shares. Courts may deviate from the Form 14 result with written justification.
AGE When Does Child Support End in Missouri?
Child support in Missouri ends when the child turns 18 — Support ends at 18 or high school graduation. Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in Missouri
Missouri charges 12% annual interest on unpaid child support arrears. Missouri’s rate of 12% is among the higher rates in the country. There is generally no statute of limitations on child support debt.
ENFORCEMENT Missouri Child Support Enforcement
Missouri has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in Missouri
Child support can be modified in Missouri when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 Missouri Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
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Days Until Due
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Payments Remaining
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Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a Missouri Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.