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Child Support Calculator

Estimate monthly child support payments based on income and expenses

Additional Information and Definitions

Your Annual Income

Include salary, bonuses, overtime, self-employment, rental income, and investment returns. Do not subtract taxes or deductions.

Other Parent's Annual Income

If exact income is unknown, you can estimate based on their occupation or lifestyle. Court proceedings can help determine actual income.

Number of Children

Only include children from this relationship who are under 18 or still in high school. Special needs children may have extended support periods.

Your Other Dependent Children

Only include children from other relationships that you are legally required to support through court orders or proven paternity.

Your Custody Percentage

Calculate based on overnight stays per year. For example, alternate weekends (4 nights/month) equals roughly 13%. Equal custody is 50%.

Monthly Healthcare Costs

Include only the children's portion of insurance premiums, plus their medications, appointments, and medical procedures. Do not include parents' healthcare costs.

Monthly Childcare Costs

Include daycare, after-school programs, or nanny services needed for work-related childcare. Summer camps may be included if they enable parents to work.

Monthly Education Costs

Include only the children's private school tuition, tutoring, required school supplies, and educational programs. Do not include parents' education costs.

Children's Monthly Food

Include only the children's portion of groceries, school lunches, and meals. Do not include food expenses for parents or other household members.

Other Monthly Expenses

Include only the children's clothing, activities, entertainment, and other regular expenses. Do not include parents' personal expenses or household costs not specific to the children.

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Frequently Asked Questions and Answers

Click on any question to see the answer

Understanding Child Support Calculations

Key terms and concepts in child support determination

Base Support Amount

The foundational support amount calculated from combined parental income and number of children, before adjusting for expenses and custody time. This uses a progressive percentage model that increases with more children.

Additional Dependents

Children from other relationships that you're legally obligated to support. Courts recognise these existing obligations by reducing your available income, typically 10% per child up to 40% maximum.

Income Shares Model

A calculation method where support is based on the combined income of both parents, ensuring children receive the same proportion of parental income they would have received if the parents lived together.

Income Imputation

When a parent is voluntarily unemployed, underemployed, or not reporting full income, courts can assign a higher income based on their earning capacity, education, and work history. This prevents intentional income reduction to avoid support obligations.

Custody Adjustment

Support amounts are adjusted based on physical custody time, recognising that the parent with more custody time is already providing direct support through daily expenses and care.

Additional Expenses

Healthcare, childcare, and education costs are shared proportionally based on parents' incomes. These are added to the base support amount to determine total support obligation.

5 Important Facts About Child Support That Could Save You Thousands

Child support calculations are more complex than most people realise. Understanding these surprising facts could significantly impact your financial planning.

1.The Income Documentation Impact

Providing detailed income documentation, including overtime, bonuses, and side income, leads to more accurate support calculations. Courts can impute higher income if they believe income is being underreported.

2.The Custody Calendar Effect

Small changes in custody time can significantly impact support amounts. Keeping a detailed custody calendar and tracking overnight stays is crucial for accurate calculations.

3.The Healthcare Modification Rule

Support orders can be modified when healthcare costs change significantly. Track all medical expenses and insurance changes to ensure fair cost sharing.

4.The Education Cost Factor

Private school tuition and enrichment programs can be included in support calculations if they align with the family's historical practices or agreed-upon educational plans.

5.The Regular Review Benefit

Support orders should be reviewed every 2-3 years or when either parent's income changes by 15% or more. Regular reviews ensure support amounts remain fair and adequate.