Delaware Child Support Calculator

Estimate your child support obligations in Delaware using the income shares model. Understand how support is calculated, what factors matter, and what to expect. Updated for 2026.

Income shares Model

Delaware uses the Melson Formula, a variation of the Income Shares model, for calculating child support. The Melson Formula is unique to Delaware and accounts for: (1) a self-support allowance for each parent before determining income available for support; (2) the children's primary support needs based on both parents' combined adjusted income; and (3) a Standard of Living Adjustment (SOLA) that allows children to benefit from parents' higher income after basic needs are met. Form 509 is the official worksheet. The formula considers both parents' net incomes after allowable deductions, health insurance premiums, and childcare costs.

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What Goes Into the Delaware Calculation?

Income

Both parents' gross income from all sources:

Wages and salary
Bonuses and commissions
Self-employment income
Investment income
Rental income
Social Security benefits
Unemployment benefits
Pension / retirement income

Deductions

Allowable deductions that may reduce gross income:

Federal and state income taxes
FICA / Social Security tax
Mandatory retirement contributions
Union dues
Health insurance premiums
Existing child support orders

Adjustments

Additional factors that can adjust the base support amount:

Number of children
Parenting time / custody split
Childcare costs
Health insurance for children
Extraordinary medical expenses
Special needs of the child
Travel costs for visitation
Extracurricular activities

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How the Income shares Model Works

1

Determine Combined Income

Add both parents' adjusted gross income together to get the combined income figure.

2

Look Up Base Obligation

Using Delaware's guidelines table, find the base child support amount for your combined income and number of children.

3

Prorate Between Parents

Each parent's share is proportional to their income. If Parent A earns 60% of the combined income, they are responsible for 60% of the obligation.

4

Apply Adjustments

Add or subtract adjustments for healthcare, childcare, shared parenting time, and extraordinary expenses.

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Modifying Child Support in Delaware

Child support orders are not permanent. You can request a modification when there is a substantial change in circumstances. Common reasons include:

Job loss or income reduction: Involuntary loss of employment or significant pay cut
Increase in income: Either parent receives a substantial raise or new income source
Custody changes: Significant change in the parenting time arrangement
Child's needs change: New medical needs, educational requirements, or special needs
Healthcare cost changes: Significant increase or decrease in health insurance or medical costs
New children: Birth of additional children (in some states)

Frequently Asked Questions

How is child support calculated in Delaware?
Delaware uses the income shares model. Delaware uses the Melson Formula, a variation of the Income Shares model, for calculating child support. The Melson Formula is unique to Delaware and accounts for: (1) a self-support allowance for each parent before determining income available for support; (2) the children's primary support needs based on both parents' combined adjusted income; and (3) a Standard of Living Adjustment (SOLA) that allows children to benefit from parents' higher income after basic needs are met. Form 509 is the official worksheet. The formula considers both parents' net incomes after allowable deductions, health insurance premiums, and childcare costs.
What income is used to calculate Delaware child support?
Gross income from all sources is typically used, including wages, salary, bonuses, commissions, self-employment income, rental income, investment income, Social Security benefits, unemployment benefits, and disability benefits. Courts may also impute income if a parent is voluntarily unemployed or underemployed.
How long does child support last in Delaware?
Child support in Delaware generally continues until the child turns 18, or through high school graduation if the child is still in school. Some orders extend to age 19 or 21 depending on the state and circumstances (college support, special needs).
Can Delaware child support be modified?
Yes, child support orders in Delaware can be modified when there is a substantial change in circumstances. Common reasons include significant income changes (job loss, promotion), changes in custody arrangement, changes in the child's needs, or changes in healthcare costs.
What if a parent doesn't pay child support in Delaware?
Delaware has enforcement mechanisms including wage garnishment, tax refund interception, license suspension (driver's and professional), bank account levies, contempt of court charges, and reporting to credit bureaus. Failure to pay can result in fines and jail time.

Related Delaware Guides

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