Delaware Melson Formula: How Child Support Is Calculated in Delaware

Delaware is one of only a few states that uses the Melson Formula for child support — a three-step calculation that's more complex than the flat-percentage models most states use, but also more protective of both parents' basic living needs. If you're going through a custody case in Delaware, understanding this formula is essential because your parenting schedule directly determines your child support obligation.

Step 1: The Self-Support Allowance

Before any support obligation is calculated, the Melson Formula reserves a basic monthly living allowance for each parent. For 2025–2026, the court-mandated Self-Support Allowance (SSA) is $1,570 per month per parent.

The formula starts with each parent's gross income, subtracts the SSA and mandatory deductions (taxes, union dues), and arrives at each parent's Net Available Income. This ensures neither parent's support obligation pushes them below subsistence.

Child support is capped at 50% of Net Available Income when children reside in one or two households, or 35% when children are spread across three or more households.

Step 2: Primary Support

This step covers the child's basic living expenses. The current allowances are:

• One child: $780 per month
• Each additional child: $410 per month

Two add-ons stack on top of the basic allowance: actual work-related childcare costs and the child's portion of health insurance premiums. Currently, 75% of the health insurance premium a parent pays is treated as a primary support expense (reduced to 50% if that parent also supports children in other households).

Uncovered medical expenses get split based on each parent's proportional share of net available income, rounded to the nearest 10%. When a parent's share falls between 41% and 59%, the split defaults to 50/50.

Step 3: Standard of Living Adjustment (SOLA)

After subtracting the SSA and primary support from each parent's income, any remaining income gets a percentage applied so children share in their parents' financial success:

• 1 child: 12% of remaining income
• 2 children: 17%
• 3 children: 21%
• Each additional child: +2%

A high-income offset triggers when a parent has more than $15,700 of monthly income available for SOLA, moderating extreme obligations.

The Overnight Credit System (Where Custody Meets Money)

This is where custody schedules and child support collide. Delaware applies a non-linear parenting-time credit based on the number of overnights in your custody order:

These brackets create sharp financial "cliffs." Going from 79 to 80 overnights triggers an immediate 10% drop in support. Dropping from 164 to 163 overnights strips the favorable shared placement formula entirely, reverting to a 30% credit model. The difference at each cliff can be hundreds of dollars per month.

Minimum Support Orders

Unless parents share equal placement or the obligated parent is disabled, Delaware imposes minimum support obligations:

• One child: $160/month
• Two or more children: $240/month
• Incarcerated parents: $80 (one child) or $120 (two or more)

Back support or arrears are repaid at 20% of the current support amount, with a floor of $20 per month.

Imputed Income: When a Parent Isn't Working

If a parent is voluntarily unemployed or underemployed, the court will impute income — treating them as if they earn what they reasonably could. A parent working at least 35 hours per week in a role aligned with their training is presumed to meet their earning capacity. Income imputation uses Delaware Department of Labor wage surveys or minimum wage standards.

Converting Weekly Pay to Monthly

The Melson Formula requires monthly figures. Delaware mandates a 4.333 multiplier to convert weekly income: Weekly Gross × 4.333 = Monthly Gross. Don't use 4.0 or 4.5 — the formula requires this specific multiplier.

Why the Overnight Count Matters More Than You Think

Parents often negotiate parenting schedules based on what feels fair or practical without realizing they're a single overnight away from a major financial shift. The 164-overnight threshold is especially consequential: it transforms the entire child support calculation from a credit-based reduction to a shared-placement formula where each household is treated as supporting 0.5 of the child.

The Delaware Child Custody & Parenting Plan Guide includes an overnight calculator worksheet and schedule templates that map directly to Delaware's credit brackets, so you can see exactly where your proposed schedule lands before you sit down at mediation.

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