Michigan uses the Income Shares Model to calculate child support, combining both parents' net incomes and allocating support based on each parent's proportional share. The official MiChildSupport Calculator at micase.state.mi.us applies the 2025 Michigan Child Support Formula Manual, effective January 1, 2025, which introduced lower medical expense thresholds and revised childcare age limits.
Key Facts: Michigan Divorce and Child Support
| Factor | Details |
|---|---|
| Support Model | Income Shares Model (MCL 552.605) |
| Filing Fee | $255 with children; $175 without (MCL 600.2529). As of March 2026. Verify with your local clerk. |
| Residency Requirement | 180 days in Michigan, 10 days in filing county (MCL 552.9) |
| Waiting Period | 6 months with minor children; 60 days without |
| Grounds | No-fault only (MCL 552.6) |
| Property Division | Equitable distribution |
| Support Termination | Age 18, or 19.5 if in high school full-time (MCL 552.605b) |
| Administering Body | Friend of the Court (FOC) in each county |
| Formula Manual | 2025 edition, effective January 1, 2025 |
| Official Calculator | MiChildSupport Calculator (micase.state.mi.us) |
How Michigan Calculates Child Support
Michigan determines child support by combining both parents' net incomes into a single figure, then allocating each parent's obligation based on their proportional share of that combined income. The 2025 Michigan Child Support Formula Manual governs all calculations, and courts must follow it unless deviation is warranted under MCL 552.605.
The Income Shares Model rests on the principle that children should receive the same proportion of parental income they would have received if the parents lived together. The child support calculator Michigan families use applies a schedule of basic support obligations tied to the combined net income of both parents and the number of children.
Here is how the formula works in practice:
- Calculate each parent's net income after permitted deductions
- Combine both net incomes into the total family income
- Look up the base support obligation on the formula schedule for that income level and number of children
- Divide the base obligation between parents in proportion to each parent's share of combined income
- Apply credits for parenting time overnights
- Add each parent's share of healthcare premiums, ordinary medical expenses, and childcare costs
- Determine the net transfer amount from the non-custodial parent to the custodial parent
The Friend of the Court office in each Michigan county administers the calculation, reviews existing orders, and recommends modifications when circumstances change. All child support orders pass through the Michigan State Disbursement Unit for payment processing and tracking.
What You Need Before Using the Michigan Child Support Calculator
Before running numbers through the child support calculator Michigan provides, gather both parents' financial documents and custody details. Accurate inputs produce reliable estimates, while incomplete data leads to figures that may differ substantially from what a court orders.
You will need the following information for each parent:
- Gross income from all sources (wages, salaries, commissions, bonuses, overtime, self-employment income, rental income, dividends, interest, pensions, trust income, Social Security benefits, workers' compensation, unemployment benefits, and annuities)
- Mandatory deductions (federal and state income taxes, FICA, mandatory retirement contributions, union dues, existing support orders for other children)
- Number of children covered by the order
- Number of annual overnights each parent exercises
- Monthly health insurance premium cost attributable to the children
- Annual out-of-pocket medical expenses for the children
- Monthly childcare costs (for children under age 13)
- Any extraordinary expenses (special education needs, travel costs for parenting time)
Gathering recent pay stubs covering at least six months, the most recent federal tax return, and documentation of childcare and medical expenses will streamline the process considerably.
Step-by-Step Guide to the MiChildSupport Calculator
The official MiChildSupport Calculator at micase.state.mi.us walks users through each input field and generates an estimate based on the 2025 Formula Manual. The tool is free, and results typically take under ten minutes to produce once you have your financial documents ready.
Follow these steps to generate your estimate:
- Navigate to the MiChildSupport Calculator at micase.state.mi.us
- Select the number of children covered by the support order
- Enter Parent 1's gross annual income and applicable deductions to calculate net income
- Enter Parent 2's gross annual income and applicable deductions
- Input the number of overnights each parent has with the children annually (the total must equal 365)
- Enter the monthly health insurance premium attributable to the children and identify which parent pays
- Enter the estimated annual ordinary medical expenses per child (the 2025 formula uses a $200 per child threshold)
- Input monthly childcare costs and identify which parent pays
- Review the summary screen showing each parent's net income, proportional share, and base obligation
- Generate the final support recommendation showing the monthly transfer amount
The calculator produces an estimate only. The Friend of the Court and the presiding judge make the final determination, and actual orders may differ based on deviation factors or stipulated agreements between the parties.
Understanding Net Income Under the Michigan Child Support Formula
Net income under Michigan's formula is gross income minus specific mandatory deductions, not the take-home pay shown on a paycheck. The formula defines income broadly to capture nearly all financial resources available to each parent, ensuring the child support calculation reflects true earning capacity.
Gross income includes:
- Wages, salaries, and tips
- Commissions, bonuses, and overtime pay
- Self-employment income (gross receipts minus ordinary and necessary business expenses)
- Rental and royalty income
- Interest, dividends, and capital gains
- Pensions, annuities, and retirement distributions
- Social Security benefits (including disability)
- Workers' compensation and unemployment benefits
- Spousal support received from the other parent or a prior relationship
- Trust and estate income
- Military pay and allowances
Permitted deductions from gross income include:
- Federal income tax (based on filing status and actual withholding or estimated payments)
- State income tax (Michigan's flat rate of 4.25%)
- FICA taxes (Social Security at 6.2% on earnings up to $168,600 in 2025; Medicare at 1.45% with no cap)
- Mandatory retirement contributions required as a condition of employment
- Union dues
- Existing child support orders for children from other relationships (actual amounts paid, not amounts owed)
- Spousal support paid to the other parent in this case
The formula may also impute income to a parent who is voluntarily unemployed or underemployed. Courts examine the parent's employment history, education, physical capacity, and local job market conditions when determining imputed income.
How Parenting Time Overnights Affect Your Support Amount
The number of overnights each parent exercises directly reduces or increases the support obligation. Michigan's formula recognizes that the parent hosting the child bears direct costs during those overnights, and the child support calculator Michigan courts rely on adjusts the transfer amount accordingly.
Michigan's overnight credit system works on a sliding scale:
- At 0 overnights for the non-custodial parent, the full calculated support amount applies with no offset
- As overnights increase, the formula gradually reduces the transfer payment
- At approximately 128 overnights (roughly 35% of the year), the overnight credit begins to reduce the obligation more substantially
- At 182.5 overnights (equal parenting time), the formula calculates each parent's obligation separately and the higher-income parent pays the difference
The formula uses actual overnights, not the schedule on paper. If a parenting time order grants 130 overnights but the parent consistently exercises only 90, the Friend of the Court may use the actual pattern when calculating or reviewing support.
Parents should track overnights carefully. A difference of even 10 to 15 overnights per year can shift the monthly support amount by $50 to $150 depending on income levels. Many parents use shared calendar applications or co-parenting tools to maintain accurate records.
Medical Expenses and Healthcare in the Michigan Formula
The 2025 Michigan Child Support Formula Manual reduced the ordinary medical expense threshold from $454 to $200 per child per year, a significant change that shifts more routine healthcare costs into the base support calculation. Each parent's share of medical costs above this threshold is allocated in proportion to their share of combined net income.
Here is how medical expenses work under the current formula:
- Ordinary medical expenses up to $200 per child per year are built into the base support obligation (previously $454)
- Expenses exceeding $200 per child are divided between parents proportionally based on income shares
- Health insurance premiums attributable to the children are added to the base obligation and allocated proportionally
- The parent who carries the insurance receives a credit for the premium amount
- Uninsured extraordinary medical expenses (orthodontia, therapy, surgery) are divided proportionally as they arise
The reduction from $454 to $200 means that parents will more frequently encounter out-of-pocket expenses that require separate allocation. For a family with two children, the threshold dropped from $908 to $400 in combined ordinary medical expenses before the proportional sharing obligation activates.
Courts generally order one parent to maintain health insurance for the children if coverage is available at a reasonable cost through an employer. The cost of adding children to an existing plan (not the total family premium) is the figure used in the child support calculation.
Childcare Costs in the Michigan Support Calculation
Work-related childcare costs are added to the base support obligation and divided between parents based on income shares. The 2025 Formula Manual changed the eligible age for childcare from 12 to 13, expanding coverage for families with older children who still require supervision while parents work.
Key points about childcare in the Michigan formula:
- Only work-related or education-related childcare qualifies for inclusion in the calculation
- Childcare costs apply for children under age 13 (changed from under 12 in the 2025 formula update)
- The actual cost of childcare is used, not an estimated or average figure
- Both parents share childcare costs in proportion to their income shares
- Summer childcare, before-school, and after-school programs all qualify if work-related
- The formula does not cap childcare costs, but courts may scrutinize amounts that appear excessive for the area
For Michigan families, average childcare costs range from $800 to $1,400 per month per child depending on the child's age and geographic location. Infant care in metropolitan areas such as Detroit, Grand Rapids, and Ann Arbor tends toward the higher end, while school-age care in rural counties falls closer to $400 to $600 per month.
When childcare costs end because a child ages out or starts school, either parent may request a modification of the support order to remove that expense from the calculation.
Michigan Child Support: Contested vs. Uncontested Comparison
The path you choose for resolving child support affects cost, timeline, and control over the outcome. Approximately 90% of Michigan divorce cases with children settle before trial, and parents who agree on a support figure using the calculator can present a stipulated order for court approval.
| Factor | Uncontested (Stipulated) | Contested (Litigated) |
|---|---|---|
| Filing Fee | $255 (MCL 600.2529) | $255 plus motion fees ($20 per motion) |
| Attorney Costs | $1,500 to $3,500 | $5,000 to $25,000+ |
| Timeline | 6 months (statutory minimum with children) | 9 to 18 months |
| FOC Involvement | Reviews stipulated agreement | Conducts full investigation and recommendation |
| Court Hearings | 1 (prove-up hearing) | 3 to 8 (motions, referee hearings, trial) |
| Support Calculation | Parents agree using formula as guide | FOC recommends; judge decides |
| Deviation Allowed | Yes, if both agree and court approves | Yes, if evidence supports under MCL 552.605 |
| Modification Process | Joint petition or standard motion | Standard motion with proofs |
| Parenting Time | Agreed schedule | Custody evaluation, possible guardian ad litem |
When Courts Deviate from the Michigan Child Support Formula
Michigan courts may deviate from the formula amount when applying the standard calculation would be unjust or inappropriate under MCL 552.605. The judge must state findings on the record explaining why the formula amount is not in the child's best interest and specify the factors supporting the deviation.
Recognized deviation factors include:
- A child's special medical, educational, or psychological needs that create expenses beyond what the formula accounts for
- A parent's extraordinary debt load from the marriage that significantly limits available income
- The child's independent income or assets (such as a trust fund or substantial inheritance)
- Both parents' agreement to a different amount, provided it still serves the child's needs
- A parent's obligation to support other children not covered by the current order
- Extreme income situations where the formula produces an amount that bears no reasonable relationship to the child's actual needs
- Shared parenting arrangements that do not fit neatly into the overnight credit system
- A parent's documented disability or chronic illness that limits earning capacity beyond what imputed income captures
Deviation is not automatic even when a factor exists. The requesting parent must demonstrate with evidence that the formula amount would be unjust. Courts typically require financial documentation, expert testimony, or detailed expense records to support a deviation request.
How to Modify a Michigan Child Support Order
Either parent may request a modification of child support when a substantial change in circumstances has occurred since the last order under MCL 552.517. The Friend of the Court also reviews orders every 36 months and may recommend modifications when the current order differs from the formula amount by 10% or more.
Circumstances that typically justify modification include:
- A significant increase or decrease in either parent's income (generally 10% or more)
- Job loss, disability, or retirement
- A change in the number of overnights exercised
- A child aging out of childcare
- Changes in health insurance costs or availability
- A child's changed medical or educational needs
- Incarceration of the paying parent for more than 180 days
- Changes in tax law or the support formula itself (such as the 2025 Formula Manual updates)
The modification process follows these steps:
- File a motion to modify child support with the circuit court in the county that issued the original order
- Serve the other parent with the motion and notice of hearing
- The Friend of the Court investigates and issues a recommendation
- Either parent may object to the FOC recommendation within 21 days
- If objected, the matter proceeds to a hearing before a judge or referee
- The court enters a modified order effective from the date the motion was filed (not retroactive to when circumstances changed)
Modifications are not retroactive. Filing promptly after a change in circumstances protects the requesting parent from accumulating arrears or overpayments during the review period.
Enforcement of Child Support Orders in Michigan
Michigan enforces child support aggressively through multiple mechanisms, and income withholding is mandatory on all new and modified orders regardless of whether the paying parent has a history of non-payment. The Friend of the Court monitors compliance and initiates enforcement actions when payments fall behind.
Enforcement tools available in Michigan include:
- Income withholding: Mandatory on all orders; employers must withhold and remit within 3 business days of each pay period
- Tax refund intercept: State and federal tax refunds seized to satisfy arrears
- License suspension: Driver's license, professional licenses, and recreational licenses suspended for non-payment
- Passport denial: Federal law blocks passport issuance or renewal when arrears exceed $2,500
- Credit reporting: Arrears reported to credit bureaus, affecting the non-paying parent's credit score
- Contempt of court: Willful non-payment can result in up to 45 days in jail for civil contempt; criminal contempt carries penalties up to 1 year
- Felony non-support: Under Michigan law, failure to pay support for 2 or more years or accumulating $15,000 or more in arrears constitutes a felony punishable by up to 4 years in prison
- Liens: Real and personal property liens to secure arrears
- Bank levies: Seizure of funds from bank accounts to satisfy past-due support
The Michigan State Disbursement Unit (MiSDU) processes all child support payments, maintaining records and generating payment histories. Parents can monitor their accounts online through the MiChildSupport portal.
When Michigan Child Support Ends
Child support in Michigan generally terminates when the child turns 18 years old. However, under MCL 552.605b, support continues until age 19 years and 6 months if the child is still attending high school full-time and has a reasonable expectation of graduating.
Specific termination rules include:
- Age 18: Support ends automatically unless the high school exception applies
- Age 19.5: Maximum age for support under the high school continuation provision
- Emancipation: Support ends if the child marries, enters active military duty, or is legally emancipated before age 18
- Death: Support terminates upon the death of the child or the paying parent (though arrears remain collectible from the estate)
- Adoption: If the child is adopted by another person, the original parent's support obligation ends
Michigan does not order post-secondary education support. Unlike some states that require parents to contribute to college costs, Michigan courts lack authority to order college support absent a voluntary agreement between the parents.
The paying parent should file a motion to terminate support rather than simply stopping payments. Continuing obligations for arrears, healthcare, and unreimbursed medical expenses may survive the general termination date, and only a court order formally closes the case.
Frequently Asked Questions
How accurate is the Michigan child support calculator online?
The official MiChildSupport Calculator at micase.state.mi.us uses the same 2025 Formula Manual that Friend of the Court offices apply. Results are typically within 5% of the final court order when accurate income, overnight, and expense figures are entered. Deviations occur when judges adjust for special circumstances under MCL 552.605.
What income counts for Michigan child support?
Michigan counts nearly all income sources: wages, salaries, bonuses, commissions, self-employment earnings, rental income, dividends, interest, pensions, Social Security benefits, workers' compensation, unemployment benefits, and trust distributions. Courts may also impute income to voluntarily unemployed or underemployed parents based on earning capacity and local job market conditions.
Can Michigan child support be modified if I lose my job?
Yes. Job loss qualifies as a substantial change in circumstances under MCL 552.517. File a motion to modify immediately because modifications take effect from the filing date, not retroactively. The Friend of the Court will investigate your employment status and may impute minimum-wage income if you are not actively seeking comparable employment.
How do overnights affect Michigan child support amounts?
More overnights with the non-custodial parent reduce the support transfer. The formula applies a graduated credit starting from the first overnight. At roughly 128 overnights (35% of the year), credits become more substantial. At 182.5 overnights (equal time), the higher-income parent pays the difference between each parent's calculated obligation.
What changed in the 2025 Michigan Child Support Formula?
Three major changes took effect January 1, 2025: ordinary medical expenses dropped from $454 to $200 per child per year, the eligible age for childcare expenses increased from 12 to 13, and the formula eliminated the previous 10% and 90% apportionment caps. These changes affect most recalculations and new orders entered after that date.
How long does Michigan child support last?
Michigan child support ends at age 18 under most circumstances. The exception under MCL 552.605b extends support to age 19 years and 6 months if the child is enrolled in high school full-time with a reasonable expectation of completing the requirements for a diploma. Michigan courts cannot order college support.
What happens if a parent does not pay child support in Michigan?
Michigan uses income withholding on all orders, tax intercept, license suspension, passport denial, credit reporting, property liens, and bank levies. Criminal penalties include contempt of court (up to 1 year in jail) and felony non-support carrying up to 4 years in prison for arrears exceeding $15,000 or non-payment lasting 2 or more years.
Does Michigan consider the cost of living when calculating child support?
The formula does not include a direct cost-of-living adjustment. However, actual expenses for housing, childcare, and healthcare vary by county, and these real costs enter the calculation through the childcare and medical expense inputs. Courts may also consider cost-of-living differences as a deviation factor under MCL 552.605.
How does the Friend of the Court affect my child support case?
The Friend of the Court (FOC) is a county-level office that investigates income and parenting time, recommends support amounts using the formula, monitors payment compliance, and initiates enforcement actions. Either parent may object to a FOC recommendation within 21 days and request a hearing before a judge or referee for an independent determination.
Can parents agree to a child support amount different from the formula?
Yes. Parents may stipulate to an amount above or below the formula calculation. The court must approve the agreement and will review whether the stipulated amount adequately meets the child's needs. The judge must state on the record why the agreed amount is appropriate if it deviates from the formula, consistent with MCL 552.605 requirements.