Does 50/50 custody mean no child support?

Not necessarily. Even with equal custody time, if there is a significant income disparity, the higher-earning parent typically pays child support to ensure the children maintain a similar standard of living in both homes.

Child Support Calculator

Q: How much is child support per child?

Guidelines vary by state. Using the income shares model with $11,500 combined monthly income: approximately $1,955/month for 1 child, $2,875/month for 2, and $3,335/month for 3.

Q: How long does child support last?

Until the child turns 18 in most states (19 in some states). It may extend through college in certain states or if the child has special needs.

Q: Can child support be modified?

Yes. Either parent can request modification when there is a significant change in income (typically 15-20% change), custody arrangement, or the child needs.

Free child support calculator. Estimate child support payments based on both parents income, custody arrangement, and number of children.

Built by Abiot Y. Derbie, PhD — Postdoctoral Research Fellow. Quantitative researcher specializing in statistical modeling and data-driven decision systems.

Enter Your Details

Parent 1 Monthly Income (gross)

Parent 2 Monthly Income (gross)

Number of Children

Custody Arrangement

Monthly Childcare Costs

Monthly Health Insurance (children)

What This Means For You

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This calculator is for informational and educational purposes only. Results are estimates based on the information you provide and standard financial formulas. This is not financial advice. Consult a qualified financial advisor for decisions specific to your situation. Full Disclaimer

Things to Know

Essential concepts for understanding your results

Calculation

How is child support calculated?

Two models: Income Shares (used by most states): combines both parents' incomes, determines total child cost, splits proportionally by income. Percentage of Income (used by some states): flat percentage of the non-custodial parent's income (17-25% for one child, up to 50% for 5+). Factors: number of children, custody arrangement, healthcare costs, childcare, and special needs. Online calculators provide estimates but court orders may differ based on specific circumstances.

Enforcement

What happens if child support is not paid?

Enforcement tools: wage garnishment (automatic deduction from paycheck), tax refund interception, license suspension (driver's, professional), bank account levy, credit reporting, passport denial (for arrears above $2,500), and contempt of court (potential jail). Child support obligations survive bankruptcy — they cannot be discharged. Most enforcement is handled through state Child Support Enforcement agencies at no cost to the custodial parent.

Modification

When can child support be modified?

Either parent can request modification for substantial change in circumstances: significant income increase or decrease (job loss, promotion), change in custody arrangement, child's changing needs (medical, educational), or new children. Most states require a 15-25% change in calculated amount to warrant modification. Never stop paying based on informal agreements — only court-ordered modifications are legally binding. Continue paying the ordered amount until a new order is issued.

Child Support Calculator: Estimate Your Monthly Obligation

A child support calculator estimates the monthly payment a non-custodial parent owes based on income, number of children, custody arrangement, and state guidelines. Unlike alimony (which varies by judicial discretion), child support in every US state follows a specific statutory formula — making it more predictable to calculate.

Enter both parents' incomes, number of children, custody percentage, and state above to estimate your child support obligation under your state's guidelines.

How Child Support Is Calculated

States use one of three models to calculate child support. The formula structure determines which parent's income is used and how custody time affects the amount:

Income Shares Model (used by 41 states + DC): Both parents' incomes are combined to determine the total child support obligation (based on a table reflecting what intact families spend on children at that income). Each parent's share is proportional to their income. The non-custodial parent pays their share to the custodial parent.

Formula: Combined Parental Income → Lookup Table (state-specific) → Total Obligation → Non-Custodial Parent's % of Combined Income × Total = Payment.

Percentage of Income Model (used by 9 states including TX, WI, MS): Only the non-custodial parent's income is used. A flat percentage applies per number of children.

Children	Texas % of Net Income	At $5,000/mo Net
1 child	20%	$1,000/mo
2 children	25%	$1,250/mo
3 children	30%	$1,500/mo
4 children	35%	$1,750/mo
5+ children	40%	$2,000/mo

Melson Formula (used by DE, HI, MT): Similar to Income Shares but first deducts a self-support reserve (basic needs) from each parent's income before calculating the obligation. This protects against reducing either parent below subsistence level.

Example Child Support Calculation

Scenario (Income Shares state): Parent A earns $75,000/year ($6,250/month gross). Parent B earns $45,000/year ($3,750/month). Two children. Parent A has 30% parenting time; Parent B has 70% (primary custody).

Step 1: Combined gross income: $10,000/month.

Step 2: State guideline table for $10,000 combined income, 2 children: approximately $1,800/month total obligation.

Step 3: Parent A's income share: $6,250 ÷ $10,000 = 62.5%. Parent A's obligation: $1,800 × 62.5% = $1,125/month.

Step 4: Custody adjustment (varies by state — some reduce obligation based on parenting time above a threshold, typically 30-40%). With 30% parenting time, some states apply a modest reduction: adjusted obligation approximately $950-$1,050/month.

Actual amounts vary significantly by state even with identical incomes and custody arrangements. Enter your specific situation above for a state-adjusted estimate.

Key Factors That Affect Child Support

Income definition: Most states use gross income from all sources: wages, bonuses, commissions, self-employment, rental income, dividends, Social Security, disability, unemployment, and pension. Some states use net income (after taxes and mandatory deductions). Self-employed parents: courts typically impute income based on tax returns, business revenue, and industry norms — aggressive deductions that reduce reported income do not necessarily reduce support obligations.

Custody and parenting time: According to the US Census Bureau (2022), 80% of custodial parents are mothers. The non-custodial parent typically pays support. In shared custody arrangements (50/50), the higher-earning parent usually pays the difference between what each would owe the other. More parenting time generally reduces the obligation — the exact threshold varies by state (some start reductions at 90+ overnights/year, others at 110+).

Healthcare and childcare add-ons: Most states add healthcare premium costs and childcare/daycare expenses to the base support amount, split proportionally by income. These add-ons can significantly increase the total obligation. Average childcare cost in the US: $14,760/year per child (Child Care Aware of America, 2024). In some states, this is the largest component of the support order.

Imputed income: If a parent is voluntarily unemployed or underemployed (working below their earning capacity to reduce support), courts can "impute" income based on earning potential — education, work history, industry rates, and local job market. A parent with an MBA and 10-year management career who takes a part-time retail job may have full-time management salary imputed for support calculations.

Frequently Asked Questions

How much is child support per child?

Varies dramatically by state, income, and custody. General range: 15-25% of the non-custodial parent's net income for one child (in percentage-of-income states). In income-shares states, the amount depends on both parents' combined income. At $6,000/month non-custodial income, 1 child: approximately $800-$1,200/month in most states. Enter your specific details above for a state-adjusted estimate.

How long does child support last?

Until the child turns 18 in most states (19 in some, 21 in NY and a few others). Support may continue through college in some states (not all — only about 15 states can order college support). Support may end earlier if the child is emancipated, joins the military, or marries. Disabled adult children may receive support indefinitely if unable to be self-supporting.

Can child support be modified?

Yes — either parent can petition for modification when there is a "substantial change in circumstances": significant income change (typically 15-20%+), job loss, new children, change in custody arrangement, or change in the child's needs (medical expenses, educational needs). Most states allow modification reviews every 2-3 years. Until a court modifies the order, the original amount remains enforceable — do not unilaterally reduce payments.

Is child support tax deductible?

No — child support is neither deductible by the payer nor taxable income for the recipient. This applies regardless of when the divorce or support order was issued. The child tax credit ($2,000/child) is claimed by the custodial parent unless the custodial parent signs Form 8332 releasing the claim. This differs from alimony, which had different tax treatment before 2019.

What happens if I don't pay child support?

Enforcement consequences escalate: wage garnishment (automatic in most states — up to 50-65% of disposable income), tax refund interception, driver's license suspension, passport denial (for arrears over $2,500), bank account levy, credit reporting, contempt of court (potential jail time), and professional license suspension. As of 2023, total US child support arrears exceeded $113 billion (OCSE federal data). Contact your state child support agency immediately if you cannot pay — modification is available, but only prospectively.

Does custody percentage affect child support?

Yes — in most states, increased parenting time reduces the child support obligation because the non-custodial parent is directly covering more of the child's expenses. The threshold and reduction formula vary by state. Moving from 20% to 40% parenting time can reduce support by 15-30% in many jurisdictions. In 50/50 custody, the higher earner typically pays the difference between the two parents' calculated obligations.

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