Melson Formula: Self-Support Reserve, SOLA, and Shared Parenting

The Melson Formula is a child support calculation method used in Delaware, Hawaii, and Montana that guarantees each parent enough income to cover basic living costs before any support obligation is set, funds the child’s basic needs next, and then directs a percentage of whatever income remains toward the child’s standard of living.¹ Judge Elwood F. Melson, Jr. of the Delaware Family Court developed it, and the Delaware Supreme Court formally adopted it in Dalton v. Clanton in 1989.²

How It Differs From the Income Shares Model

Most states use Income Shares, which estimates what parents would have spent on a child in an intact household and divides that amount by each parent’s share of combined income. The Melson Formula builds on the same income-sharing idea but adds two structural protections the standard model leaves out.¹

The first is a subsistence carve-out for each parent before any obligation is calculated. Standard Income Shares guidelines may include a low-income adjustment, but Melson treats self-support as a built-in step rather than an exception. The second is a standard-of-living adjustment that captures a percentage of surplus income above basic needs, so a child’s support rises automatically as a parent earns more without waiting for the other parent to file a modification. The Delaware Supreme Court put the philosophy this way: parents keep enough income to meet their most basic needs, the child’s basic needs are funded next, and any remaining income is shared so the child benefits from the parent’s higher standard of living.²

The Three Steps

Step One: The Self-Support Reserve

Each parent’s income is reduced by a self-support reserve covering food, shelter, and basic necessities. Under Delaware’s Rule 502, the reserve is set at 120 percent of the federal poverty guideline for a one-person household, rounded to the nearest ten dollars and updated every January.³ For 2026, Delaware’s self-support allowance is $1,600 per month.⁴

The reserve applies to both parents. The reasoning is practical: a parent pushed below subsistence will eventually stop paying altogether. If income falls below the reserve, the obligation does not automatically drop to zero. Delaware imposes a minimum order of $160 per month for one child or $240 for two or more children even when a parent’s income doesn’t clear the self-support threshold.⁴

Step Two: Primary Child Support

After the reserve is subtracted, the formula calculates the child’s basic needs. The Delaware Supreme Court described this tier as “the minimum amount required to maintain a child at a subsistence level,” with childcare costs and extraordinary medical expenses added on top.² Health insurance premiums for the child and work-related childcare are factored in at this step.

Each parent’s share is based on their percentage of combined income remaining after both self-support reserves come out. If one parent accounts for 65 percent of the combined available income, that parent covers 65 percent of the primary support.

Step Three: The Standard-of-Living Adjustment

Whatever income remains after both reserves and the child’s primary needs are funded gets multiplied by a set percentage. This Standard-of-Living Adjustment, or SOLA, is what makes the formula distinctive. It keeps the child from being capped at a bare subsistence level and lets support rise with a parent’s earnings.

Delaware’s 2026 SOLA rates are 12 percent of remaining income for one child, 17 percent for two children, 21 percent for three, and an additional 2 percent for each child beyond that.⁴ Hawaii and Montana apply their own rates, which may differ.

A quick illustration: a parent with $3,000 left after the self-support reserve and primary support obligations would owe an additional $360 per month for one child ($3,000 × 12%). As that parent’s income grows, the figure grows with it.

Running the Numbers

The sequence matters, because each step feeds the next.

The calculation starts with gross income and converts it to a net figure. Delaware’s worksheet subtracts a self-employment adjustment of 7 percent of documented self-employment income, mandatory deductions such as pension contributions and union dues, and the self-support allowance.⁴ Nontaxable income receives a 25 percent upward adjustment to put it on roughly equal footing with taxable earnings. The result is each parent’s net income available for primary support.

The child’s total primary support needs are then prorated between the parents by their shares of combined available income. If combined available income is $4,000 and one parent accounts for $2,800 of that, they carry 70 percent of the primary obligation.²

Finally, any income still left after primary support is multiplied by the SOLA percentage, and that dollar amount is added to the parent’s share of primary support. The sum becomes the monthly order, enforceable like any other child support judgment.⁴

How Income Is Counted

Most disputes under the formula come down to the income figure. The net is wide: wages, salaries, commissions, bonuses, investment income, rental income, and most other recurring sources count. Need-based public assistance like Supplemental Security Income and SNAP is generally excluded.

When a parent is voluntarily unemployed or underemployed, the court can impute income based on what that parent could reasonably earn. Imputation isn’t automatic. Courts typically require a finding that the parent is deliberately suppressing income to avoid support, not that they simply took a lower-paying job. A parent who loses a job involuntarily may be imputed at a reduced level, such as half their prior earnings, rather than their full previous salary. The burden falls on the parent seeking imputation to show bad faith, and the court must make a specific finding before substituting earning capacity for actual income.

When a Parent Has Other Children

Parents with children from more than one relationship could, in theory, see the formula consume all of their income if each obligation were calculated in isolation. Two mechanisms prevent that.

When a parent supports other dependent children not covered by the current order, their available income is reduced to 70 percent before the primary support calculation. The 30 percent reduction acknowledges the competing duty without wiping out the current child’s support.⁴ Stepchildren are generally excluded from this adjustment.

A self-support protection cap also limits total obligations to a percentage of net available income. Under Delaware’s 2026 worksheet, the cap is 50 percent when the parent has children in fewer than three households, and 35 percent when children span three or more households.⁴ The final order is the lesser of the calculated amount or the cap.

Shared Parenting Time

The standard calculation assumes the custodial parent bears nearly all direct expenses, which overstates the non-custodial parent’s share when parenting time is split more evenly. Melson states, like all states, adjust for substantial shared time.

The specifics vary. Most set an overnight threshold, commonly somewhere between 90 and 128 overnights per year, above which the formula adjusts. Below that threshold, the standard calculation applies. Above it, the adjustment may offset one parent’s obligation against the other’s, reduce the non-custodial parent’s share based on time percentage, or use a multiplier so a small increase in overnights doesn’t produce a dramatic drop in support. The details depend on which state’s version of the formula governs the case.

Changing an Order Later

Child support orders can be modified when circumstances change. The threshold varies by state. In Delaware, if the petition is filed within two and a half years of the last order, the court will only impose a modification if the recalculated amount differs by more than 10 percent from the current order.⁵ Thresholds across the country generally range from 10 to 20 percent depending on the jurisdiction.⁶

Common triggers include job loss, a significant raise, a change in the child’s medical needs, or a shift in the parenting schedule. The SOLA step means income increases are partially self-adjusting, but a major change still warrants a formal recalculation.

If Payments Stop

A Melson Formula order carries the same legal weight as any other child support judgment. Federal law caps wage garnishment for child support at 50 percent of disposable earnings if the parent is supporting another spouse or child, and 60 percent if they are not. An additional 5 percent can be garnished when payments are more than 12 weeks overdue.⁷ Beyond wage withholding, enforcement tools include tax refund intercepts, license suspensions, passport denial, and contempt proceedings that can result in fines or jail time.

1
National Conference of State Legislatures. Child Support Guideline Models
2
Justia Law. Dalton v Clanton – 1989 – Delaware Supreme Court Decisions
3
Delaware Courts. Family Court Rules of Civil Procedure – Rule 502
4
Delaware Courts. 2026 Delaware Child Support Formula
5
Delaware Courts. Family Court of the State of Delaware
6
Administration for Children and Families. Essentials for Attorneys in Child Support Enforcement – Modification of Child Support Obligations
7
U.S. Department of Labor. Fact Sheet 30 – Wage Garnishment Protections of the Consumer Credit Protection Act