How accurate is this child support calculator?

This calculator provides estimates based on simplified versions of each state's child support guidelines. Official calculations may include additional factors such as health insurance, child care, and special needs. Use this as a planning tool and consult your state's official worksheet or a family law attorney for exact figures.

What income is included in child support calculations?

Most states consider all sources of income including wages, salaries, commissions, bonuses, self-employment income, rental income, investment returns, and sometimes imputed income if a parent is voluntarily unemployed or underemployed. Each state defines income differently — some use gross, others net.

Does 50/50 custody mean no child support?

Not necessarily. Even with equal parenting time, the higher-earning parent often pays some child support to equalize the child's standard of living in both homes. The amount depends on the income difference and your state's shared-custody formula.

Can child support exceed the state guidelines?

Yes. Judges can deviate above or below the guideline amount based on factors like extraordinary medical needs, private school tuition, special talents or activities, and the child's pre-divorce standard of living. High-income cases often involve judicial discretion above the guideline caps.

What if a parent hides income to lower child support?

Courts can impute income to a parent who is voluntarily unemployed, underemployed, or hiding earnings. Judges may examine tax returns, bank records, lifestyle evidence, and work history to determine actual earning capacity. Penalties for hiding income can include contempt of court.

How often can child support be modified?

Most states allow modification when there is a substantial change in circumstances such as job loss, significant income change, or a change in custody arrangements. Many states also allow review after a set period (typically 3 years) or when the calculated amount differs from the current order by 10-20%.

Free Child Support Calculator — State-Specific Estimates for All 50 States

Pick your state, enter two incomes, and see what child support looks like under your jurisdiction's formula — no credit card needed

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Simple Child Support Calculator

Get a quick estimate of potential child support in under 60 seconds based on simplified state guidelines, without personal information or a credit card.

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**Important Disclaimer:**

This calculator is for educational purposes only and provides only rough estimates that might vary significantly from official state calculations. Official calculations include many additional factors not included here. This tool does not constitute legal advice and should not be relied upon for any important decisions. For accurate calculations, please consult a family law attorney or your state's official child support agency.

For a more comprehensive (though still potentially estimated) calculation, consider registering for our full application or seeking professional legal advice.

The Calculator Above Is Just the Start

See what the full child support report looks like — detailed breakdowns, scenario modeling, and state-specific insights your attorney will actually use.

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How the Child Support Calculator Works

We analyzed the child support statutes for every U.S. jurisdiction. The result is a quick estimate that follows the same decision tree a court would use.

Choose Your Jurisdiction

Your state dictates which model applies — income shares, flat percentage, Melson, or hybrid. The dropdown routes you to the right one.

Add Financial & Custody Details

Enter annual income for both parents, number of children, and custody split. The engine accounts for shared-parenting adjustments automatically.

Read Your Results

See the estimated monthly payment, which parent pays, and context about how your state typically enforces guideline amounts.

The Four Calculation Models Behind U.S. Child Support

Each state chose its own mathematical framework. Knowing which one governs your case tells you whether you need one income figure or two, and how much leverage your custody arrangement gives you.

Income Shares Model (41 states)

Both parents' earnings are pooled, then split proportionally. The noncustodial parent's share becomes the monthly payment.

•Inputs needed: Both incomes + child count
•Adjusted for: Health insurance, childcare, parenting time
•Example: Combined $10K/mo, 2 kids = $1,800 obligation. Parent earning 60% pays $1,080

AL, AZ, CA, CO, CT, FL, GA, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MO, NE, NH, NJ, NM, NY, NC, OH, OK, OR, PA, RI, SC, SD, TN, UT, VT, VA, WA, WV, WY

Percentage of Income (5 states)

Only the noncustodial parent's income matters. A flat percentage is applied — the other parent's earnings have zero effect.

•Texas: 20% / 25% / 30% / 35% / 40% for 1–5+ kids, capped at $9,200/mo net
•Wisconsin: 17% / 25% / 29% / 31% / 34% of gross
•Nevada: 18% / 25% / 29% / 31% + 2% per child beyond four

TX, AK, NV, ND, WI

Melson Formula (3 states)

Adds a self-support reserve — each parent keeps enough for basic subsistence before any dollar goes toward support.

•Lower payments for low-income payors vs. income-shares states
•Child receives proportional share of income above the reserve floor

DE, HI, MT

Hybrid & Algebraic (CA, DC, MS)

California's K-factor plugs both incomes + exact timeshare into an algebraic equation. Every single overnight shifts the number — no threshold, no cliff.

•D.C. blends income-shares with flat-percentage elements
•Overnight count matters more here than in any other model

Not Sure Which Model Applies to You?

The calculator auto-detects your state's model when you select it. You'll see the model name alongside your estimate.

Check my state's model

Variables That Move the Number Up or Down

Income, custody, and child count are the three biggest drivers. But courts also weigh secondary factors that can shift the final order 15–30% in either direction.

Which “Income” Your State Measures

Getting the income definition wrong is the #1 reason DIY worksheets produce bad numbers. Key differences:

•Gross-income states (e.g., Wisconsin) — start with a higher base before any deductions
•Net-income states — subtract taxes and mandatory deductions first
•Texas “net resources” — deducts fed/state taxes, Social Security, health insurance, union dues
•New York hybrid — guideline percentages up to $183K, then judicial discretion above that

How Each Additional Child Changes the Math

Adding a second child does not double the obligation. Schedules build in economies of scale:

•Texas: 1 child = 20%, 5 children = 40% (not 100%)
•Income-shares schedules show the same tapering per-child cost
•Multi-family credit: Children from prior relationships reduce the obligation per family unit

Overnight Thresholds & Parenting-Time Credits

Small scheduling changes can have outsized financial impact. State thresholds vary widely:

nights — Florida

days — Virginia

nights — Colorado

45.1%

of time — Minnesota

Continuous

K-factor — California

None

no auto-adjust — Texas

50/50 custody does not mean $0 support. If Parent A earns $120K and Parent B earns $50K, most states require a transfer payment — typically 40–60% less than a traditional order, but not zero. Map your exact overnights →

Insurance Premiums & Childcare Add-Ons

After the base obligation, virtually every state layers on two mandatory add-ons:

Health insurance — the incremental cost of adding the child to a policy
Work-related childcare — daycare, after-school care, summer camp

Both are split proportionally by income. A $600/mo daycare + $250/mo insurance premium can add $400+ to the noncustodial parent's total. These are separate line items and cannot be waived in most states.

When Income Exceeds the Schedule

Every guideline has a ceiling. Above it, the judge exercises discretion:

•Texas: $9,200/mo net resources (~$175K gross)
•New York: $183K combined income
•Ohio: $336,467 combined gross

Above the cap, judges weigh the child's lifestyle, education, extracurriculars, and travel. Detailed documentation (tuition invoices, receipts) is what drives higher-than-guideline orders.

The Overnight Count: Where Custody and Dollars Intersect

Every additional overnight shifts spending from a transfer payment to direct expenditure — and most state formulas reduce the support order accordingly.

Why Courts Count Nights, Not Hours

An overnight means a bed, meals, utilities, and morning routines — fixed costs regardless of the child's age. A Tuesday afternoon pickup ending at 7 PM doesn't carry the same expense. That's why 42 states use overnight counts, not total hours.

What Each Schedule Means in Dollars

~52 nightsEvery-other-weekend — below most adjustment thresholds, full guideline amount

~104 nights+ Wednesday overnight — crosses CO (93) and VA (91) thresholds, meaningful reduction

130–140+ alternating summer weeks — cuts base obligation 20–30% in most states

182.5True 50/50 — steepest reduction (40–60%), but higher earner still pays to equalize

The difference between 88 and 94 overnights can be the difference between a full guideline order and a shared-custody discount. Our parenting schedule calculator maps any arrangement to an exact overnight count.

How Long Child Support Lasts — and How to Change It

A child support order is a snapshot of two incomes at a single point in time. Life changes. The law accounts for that — but only if you take the right steps.

Termination Age by State

•Default: Child's 18th birthday in most states
•High school extension: ~25 states extend through graduation (cap: age 19)
•New York: Courts can order support until age 21
•College coverage: IN, IA, MO permit orders covering a bachelor's degree
•Early termination: Marriage, active-duty military, full-time self-supporting employment

Triggering a Modification

Every state requires a “substantial change in circumstances.” What counts as “substantial” varies:

•Missouri: 20% change in amount OR $50/month difference
•Texas: 3 years since last order OR 20%/$100 difference
•AR & NH: Either parent can request review every 36 months — no threshold

Qualifying events: Involuntary job loss, disability, custody changes, child's special needs. Voluntary underemployment does not qualify.

What Happens When Payments Stop

Unpaid child support triggers an escalating enforcement toolkit:

Wage withholding — automatic in most new orders
Tax refund intercept — federal and state
License suspension — driver's, professional certifications
Passport denial — federal law triggers at $2,500 in arrears
Credit reporting — debt reported to bureaus
Contempt of court — potential jail time

Arrears survive bankruptcy — they cannot be discharged. Courts cannot retroactively forgive amounts that piled up before a modification was filed. Delaying is one of the costliest mistakes a payor can make.

Frequently Asked Questions

How close will this estimate be to my actual order?

•Percentage-of-income states (TX, WI, NV): typically within 5–10% of the official worksheet
•Income-shares states: wider margin because this tool doesn't capture insurance/childcare add-ons

Treat the result as a planning baseline, then consult an attorney for a figure you can rely on in negotiations.

What counts as “income” for child support?

Courts cast a wide net:

•W-2 wages, 1099 freelance, bonuses, commissions
•Rental income, dividends, trust distributions, recurring gifts
•Imputed income: If a parent is underemployed by choice, courts can assign a higher earning capacity

We split custody 50/50 — do I still owe support?

Almost certainly yes, unless both parents earn identical incomes. Equal time eliminates the custody imbalance but not the earnings gap. Most states calculate each parent's obligation, then offset — the higher earner pays the difference. The amount is typically 40–60% less than a traditional arrangement, but rarely zero.

Can a judge order more than the guideline amount?

Yes. Deviation is permitted in every state. Common upward triggers:

•Extraordinary medical expenses
•Private school tuition, competitive sports, performing arts
•High-income situations where the schedule caps out

My ex is hiding income — what can I do?

File a motion for discovery. Courts can subpoena tax returns, bank statements, brokerage accounts, and business records. Judges also examine lifestyle evidence — claiming $40K/year while driving a new BMW invites scrutiny. Deliberate concealment can result in imputed income, attorney fees awarded to you, and contempt charges.

How soon after a job change can I request a modification?

Immediately after an involuntary job loss — no waiting period. But the change must be “substantial and continuing,” not temporary. A two-week gap won't qualify; a layoff with six months of lower-salary job searching will. Some states (TX, AR, NH) also allow automatic review every 3 years.

This Estimate Is a Starting Point. Get the Complete Picture.

Our full application models custody scenarios side by side, factors in insurance and childcare add-ons, and generates a report you can bring to mediation or your attorney.

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