Delaware Child Support Laws (2026): Melson Formula Guide

Delaware calculates child support using the Melson Formula, one of only three states in the country to do so under Title 13, Chapter 5 of the Delaware Code. The formula weighs each parent's income, a self-support allowance, the children's primary needs, and a Standard of Living Adjustment to set the final obligation. Use the Delaware child support calculator below to estimate a guideline amount, or open the Delaware child support calculator for the full step-by-step tool.

What Are Delaware's Child Support Laws?

Delaware requires both parents to financially support their children under Title 13, Chapter 5 of the Delaware Code. The state uses a distinctive calculation method called the Melson Formula, which sets it apart from the majority of states that rely on simpler income shares or percentage-of-income models.

The Delaware Family Court oversees all child support matters. The Division of Child Support Services (DCSS), a division of the Delaware Department of Health and Social Services, assists parents with establishing, modifying, and enforcing child support orders.

Quick Reference Table

Understanding the Melson Formula

The Melson Formula, named after retired Delaware Family Court Judge Elwood F. Melson Jr., is one of the most detailed child support calculation methods in the United States. Only Delaware, Hawaii, and Montana use this approach. It builds on the Income Shares model but adds layers of protection for both parents and children.

The formula rests on three core principles:

1. Children's needs come first. A child's basic needs must be met before either parent keeps income beyond their own essentials.
2. Parents deserve self-support. Both the custodial and noncustodial parent are entitled to retain a minimum amount of income to cover their own basic living expenses.
3. Children share in prosperity. After both parents' basic needs and the children's primary needs are covered, any remaining income is shared with the children through a Standard of Living Adjustment.

This three-step structure ensures that low-income parents are not pushed below the poverty line while still prioritizing adequate support for their children.

How Is Child Support Calculated in Delaware?

The Melson Formula follows a structured, multi-step process. Each parent's obligation is calculated based on their proportional share of the combined household income.

Step 1: Determine Net Income

The court starts with each parent's gross income from all sources. This includes wages, salaries, commissions, bonuses, pensions, Social Security benefits, rental income, and investment returns. The court then subtracts allowable deductions:

• Mandatory pension or retirement contributions (voluntary contributions to a 401(k) or similar plan count too, up to 5% of gross income including mandatory ones)
• Union dues
• Court-ordered alimony paid
• Disability insurance premiums purchased for income replacement
• Health insurance premiums for a policy that does not cover the children of this union
• Other mandatory unreimbursed business expenses required by the employer

Two items parents commonly expect on this list are not there. Taxes are not deducted. Rule 502(b)(1) states that taxes, actual or estimated, shall not be deducted in determining available income; the only tax-related adjustment is a 7% reduction for a self-employed parent who documents actual payment of self-employment tax. And a health insurance premium that covers the children of this union is not a deduction either. Under Rule 502(c)(1) and Rule 503(b)(3), that premium is counted later as an element of the children's primary need, at 75% of the out-of-pocket cost (or 50% if the parent has other minor children to support). Support for other dependent children is likewise not a line-item deduction: Rule 502(e) recognizes it by multiplying net income after the self-support allowance by 70%.

Rule 502 calls the result of these subtractions the parent's net income. Delaware's own term "net available income" is what remains after the self-support allowance in Step 2 comes off; the rule never uses the phrase "adjusted gross income."

Step 2: Apply the Self-Support Allowance

Each parent receives a self-support allowance. For 2026, this amount is $1,600 per month per parent, set by Family Court Civil Rule 502(d) at 120% of the HHS Federal Poverty Guideline for a one-person household, rounded to the nearest $10, and adjusted every year by February 1 based on updated HHS poverty guidelines. The allowance ensures neither parent falls below a basic subsistence level.

Step 3: Calculate the Primary Support Obligation

After the self-support allowance is subtracted, the remaining income is used to determine each parent's share of the children's basic needs. The primary support allowance is calculated using a formula based on the number of children. For 2026, the calculation is:

Number of children x $420 + $380 = Primary Support Allowance

Those two components are not arbitrary. Rule 503(b)(1) derives them from the self-support allowance: the per-child component is 25% of the self-support allowance plus $20, and the per-household component is 25% of the self-support allowance minus $25, each rounded to the nearest $10. On the 2026 allowance of $1,600 that produces $420 per child and $380 per household, which is why Form 509i (Rev. 2/26) lists $800 for one child and $420 for each additional child. Where a child spends more than 163 overnights in both homes, the child counts as ".5" in each household and a half-child allowance of $590 plus $210 for each additional half child applies.

Each parent pays their proportional share of this amount based on their percentage of combined adjusted income.

Step 4: Apply the Standard of Living Adjustment (SOLA)

If either parent has income remaining after covering their self-support allowance and primary support obligation, the SOLA kicks in. This ensures children benefit from their parents' higher earnings. The current SOLA percentages are:

A high-income offset applies when either parent's net income available for SOLA (Line 15) reaches $16,000 per month. For each parent above that threshold, the court subtracts $16,000, combines the excess amounts, and applies a 30% reduction to the total, reducing the SOLA obligation for high earners.

Minimum Support Orders

Delaware imposes a minimum support obligation regardless of parental income:

• $160 per month for one child
• $240 per month for two or more children

These minimums do not apply when the child resides in shared placement or when the obligated parent is disabled.

Imputed Income

If a parent is voluntarily unemployed, underemployed, or fails to provide adequate financial information, the court may impute income based on earning capacity. The presumptive minimum income for imputation purposes is $2,390 per month, based on Delaware Department of Labor statewide entry-level wage data at 150 hours per month (updated annually).

Delaware courts may find a parent's earning capacity diminished, rather than impute full earning capacity, in situations including:

• Continuous confinement exceeding 180 days, which Rule 501(k) treats as evidence of diminished earning capacity unless the parent has independent income, resources, or assets to pay at the pre-incarceration level
• Medical limitations, or a determination of eligibility for SSDI or SSI (a parent receiving SSI is not imputed income unless they have earning capacity independent of that entitlement)
• A child of the union with profound special needs that inhibit the support recipient's ability to maintain employment (Rule 501(c)(4))

The Delaware Department of Labor wage survey data helps courts estimate earning capability for underemployed parents.

Use the Official Calculator

The Delaware Family Court provides a free online Child Support Calculator that walks you through the Melson Formula step by step. Both parents can also download the official Form 509 to calculate support manually.

Shared and Equal Placement

Delaware recognizes shared placement when a child spends at least 164 overnights per year with each parent. This threshold triggers a different calculation under the Melson Formula.

In shared placement situations, the formula assumes roughly equal parenting time. Each parent enters 0.5 for the number of children in their household. The higher-earning parent typically pays support to the lower-earning parent to ensure the children maintain a similar standard of living in both homes.

Key Rules for Shared Placement

• Both parents must have at least 164 overnights annually to qualify.
• The court considers the actual overnight schedule, not the theoretical one.
• Failure to contribute to shared incidental expenses (clothing, school supplies, extracurricular activities) may result in denial of shared placement status for calculation purposes.
• Transportation costs between households may also factor into the calculation.

Military Parents

For active-duty military members stationed in or connected to Delaware, certain allowances are excluded from income calculations:

• Cost of living stipends for high-cost assignment locations
• Clothing allowances
• Combat zone pay (in some circumstances)

Basic Allowance for Housing (BAH) and Basic Allowance for Subsistence (BAS) may still be considered as income depending on the circumstances.

How to File for Child Support in Delaware

Parents can pursue child support through two main paths:

Through DCSS

The Division of Child Support Services provides free assistance including:

• Locating absent parents
• Establishing paternity through genetic testing
• Obtaining court orders for support
• Collecting and disbursing payments
• Enforcing existing orders

DCSS contact numbers:

• New Castle County: (302) 577-7171
• Kent County: (302) 739-8299
• Sussex County: (302) 856-5386

All three offices are open Monday through Friday, 8:00 a.m. to 4:30 p.m.

Directly Through Family Court

A parent can also file a Petition for Support directly with the Delaware Family Court. The process typically follows these steps:

1. The custodial parent files a petition for support.
2. The respondent must be served within 20 days.
3. Both parties attend a mandatory mediation conference where a mediator uses the Delaware formula to calculate support.
4. If no agreement is reached, the case proceeds to a hearing before a Family Court Commissioner.
5. The Commissioner issues an order, which usually includes wage attachment.

How to Modify Child Support in Delaware

Delaware law allows modification of child support orders, but with specific restrictions outlined in the Family Court rules.

The 2.5-Year Rule

A parent cannot file a petition for modification within 2.5 years of the last current support order unless a substantial change in circumstances has occurred. After 2.5 years, the waiting period and the substantial change requirements no longer apply.

What Counts as a Substantial Change?

For petitions filed within the 2.5-year window, the change must:

• Be alleged "with particularity" in the petition
• Not result from the petitioner's voluntary or wrongful conduct
• Produce a new calculation that changes the support amount (upward or downward) by more than 10%

Common qualifying changes include:

• Involuntary job loss or significant income change
• Changes in health insurance cost or availability
• Changes in daycare or private school tuition
• A change in the number of minor children being supported
• Serious medical emergency affecting a parent or child

The Modification Process

1. Contact DCSS or file a Petition for Modification with Family Court.
2. Provide documentation of changed circumstances.
3. Attend a mediation conference.
4. If mediation fails, a Commissioner holds a hearing and issues a decision.

Important: Delaware does provide automatic relief for incarcerated parents. Under Family Court Civil Rule 506(c)(1), every prospective current support obligation established or modified after January 31, 2019 automatically decreases to one-half of the applicable minimum order after 180 days of continuous incarceration, and Form 509i (Rev. 2/26) states the adjustment takes effect on the 181st day of continuous confinement. The presumption is rebutted if the obligated parent has independent income, resources, or assets sufficient to keep paying at the pre-incarceration level, and a petition may be filed to fix the exact date of adjustment. The obligation does not revert automatically on release, but release is itself a substantial change of circumstances for modification purposes. For orders issued before February 1, 2019, the reduction is not automatic and requires a Petition for Support Modification.

What Happens if You Do Not Pay Child Support in Delaware?

Delaware takes child support enforcement seriously. The state uses both civil and criminal tools to collect unpaid support. Under Title 13, Chapter 22 of the Delaware Code, the Division of Child Support Services has broad enforcement authority.

Civil Enforcement Actions

Criminal Enforcement

Willful failure to pay child support can lead to criminal charges:

• Unpaid support of more than $5,000, or unpaid for more than 1 year, can result in a federal misdemeanor charge under 18 U.S.C. Section 228
• Unpaid support of more than $10,000, or unpaid for more than 2 years (or interstate travel to evade payment), can result in a federal felony charge, punishable by up to 2 years in federal prison
• Contempt of court findings can result in fines and jail time

Employer Obligations

Under Title 13 Section 513, employers who receive income withholding orders become primarily liable for compliance. Employers with 50 or more employees must remit payments by electronic funds transfer. An employer who fails to comply or retaliates against an employee for having a wage attachment faces:

• First offense: Fine up to $1,000 and/or up to 90 days imprisonment
• Subsequent offenses: Fine up to $5,000 and/or up to 1 year imprisonment

DCSS uses the State Directory of New Hires, financial institution data matching, and tax return information to locate and track delinquent parents.

When Does Child Support End in Delaware?

Under Title 13 Section 517, child support in Delaware terminates by operation of law when:

• All minor children subject to the order reach 18. Support does not continue past 18 by default.
• If a child over 18 is still enrolled in high school, current support runs until the child receives a high school diploma or turns 19, whichever happens first.
• Custody of all children subject to the order is transferred to the obligated parent, either by court order or by the written voluntary agreement of the parents.

Section 517 does not list emancipation, marriage, or military enlistment as events that terminate support by operation of law. A parent who believes one of those events should end an order needs to raise it with the Family Court rather than assume the obligation has lapsed.

Separately, section 517(c) provides that the obligation to pay arrears or past due support terminates by operation of law once all arrears have been paid.

Disabled Adult Children

If a child is mentally or physically disabled and unable to support themselves, the court may order support to continue indefinitely. This requires a separate court order and medical documentation.

Emancipation in Delaware

Delaware does not have a general emancipation statute, and emancipation is not one of the events that terminates a support order by operation of law under section 517. A parent or minor raising emancipation should expect the Family Court to decide the question on the facts of the individual case, and should not treat a child's independence as ending an existing order on its own.

Arrears After Termination

Even after current support ends, any unpaid arrears remain fully collectible. There is no statute of limitations on collecting child support arrears in Delaware. Payments continue until all arrears are satisfied.

Payment Methods in Delaware

Delaware offers multiple ways to make child support payments:

• Wage attachment (most common, ordered in nearly all cases)
• iPayOnline (electronic payment portal)
• Check or money order (mailed to DCSS)
• TouchPay kiosks (in-person payment locations)
• Direct deposit through employer
• U.S. Bank ReliaCard (prepaid debit card for receiving payments)

Visit the DCSS publications page for current payment addresses and instructions.

2026 Formula Values

Delaware's child support formula undergoes annual review. The monetary values within the formula (self-support allowance, primary support amounts, imputed minimum income) are updated every year by February 1 based on HHS poverty guidelines and Delaware Department of Labor wage data. The February 2026 update (Form 509 Rev. 2/26) set the self-support allowance at $1,600 per month and the presumptive imputed income at $2,390 per month. These annual adjustments do not automatically modify existing orders. A formal petition for modification is still required to change a current order based on updated formula values.

More Delaware Laws

• Delaware Alimony Laws
• Delaware Child Custody Laws
• Delaware Divorce Laws