Family Law · Child Support and Custody

Child Support in Pennsylvania: How It Is Calculated, Modified, and Enforced

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Child support in Pennsylvania is determined by a statewide formula, not by what either parent thinks is fair. The formula is based on both parents’ incomes, the number of children, the custody arrangement, and certain additional expenses. The guidelines were updated effective January 1, 2026 — the first revision in four years — and basic support obligations increased by roughly 3 to 10 percent across most income levels. Parents operating under orders entered before 2026 are not automatically entitled to a modification; a petition must be filed.

Understanding how Pennsylvania calculates child support — what income counts, how custody time affects the amount, and what costs are added on top of the basic obligation — is essential for any parent navigating a support proceeding, whether at the initial order stage or seeking a modification. For broader guidance on child custody and family law matters, see our Family Law page.

At Lebovitz & Lebovitz, P.A., we represent parents in child support proceedings throughout Allegheny County and Western Pennsylvania. We handle initial support orders, modifications, enforcement actions, and the coordination of support with custody arrangements.

The Income Shares Model

Pennsylvania calculates child support under the Income Shares Model, governed by Pa. R.C.P. 1910.16-1 through 1910.16-4. The model is based on the principle that a child should receive the same proportion of combined parental income that the child would have received if the parents had remained together. The starting point is the combined monthly net income of both parents, which is matched against the Basic Child Support Schedule to determine the total basic support obligation for the number of children involved. For a detailed walkthrough of how Pennsylvania calculates support, see that page. That obligation is then divided between the parents in proportion to each parent’s share of the combined income. To see how support is calculated in real scenarios at a specific income level, see our page on child support at $1,000 per week.

The parent with less physical custody time pays their proportional share to the other parent. If the parents share custody equally and one parent earns more, the higher-earning parent pays the difference between their respective calculated obligations. The formula produces a baseline figure that is then adjusted for custody time and additional expenses.

What Counts as Income for Child Support Purposes

Pennsylvania child support is calculated on net income — gross income after allowable deductions. Gross income includes wages, salary, overtime, bonuses, commissions, self-employment income, rental income, investment income, Social Security benefits, unemployment compensation, workers’ compensation, and pension or retirement income. The guidelines cast a wide net on what counts as income.

From gross income, the following are deducted to arrive at net income: federal, state, and local income taxes; FICA contributions; mandatory union dues; mandatory retirement contributions required as a condition of employment; and existing court-ordered support obligations for other children. Health insurance premiums for the children are handled separately as an add-on expense rather than a deduction from net income.

A parent who is voluntarily unemployed or underemployed — meaning earning less than their demonstrated earning capacity — may have income assigned to them based on that earning capacity. For cases involving business owners or independent contractors, see our page on calculating income for self-employed parents. Courts consider education, work history, job market conditions, and the availability of suitable employment. A parent cannot reduce their support obligation by voluntarily taking a lower-paying position or leaving the workforce without good cause.

How Custody Time Affects the Support Calculation

The custody arrangement directly affects the support amount. In a primary custody arrangement where one parent has the majority of overnights, the non-custodial parent pays their proportional share of the basic support obligation to the custodial parent without a custody-time adjustment.

When a parent has 40 percent or more of the annual overnights — approximately 146 or more nights per year — a shared physical custody adjustment applies under Pa. R.C.P. 1910.16-4(c). The adjustment accounts for the fact that both parents are directly providing for the child’s needs during their respective parenting time, which reduces the amount transferred between households. The 2026 guidelines updated the Basic Child Support Schedule to remove the prior 30 percent custody presumption that had previously been built into the schedule, making the custody adjustment more accurate and fact-specific.

In split custody arrangements — where multiple children are divided between the parents — a separate calculation is performed for each household and the resulting obligations are offset against each other.

Additional Expenses Added to the Basic Obligation

The basic support obligation covers the child’s food, clothing, and shelter. Several additional expenses are allocated on top of the basic obligation, divided between the parents in proportion to their respective incomes. For a full breakdown of what child support is expected to cover, see that page.

Health insurance premiums for the children are added to the support calculation and allocated proportionally. Work-related childcare costs are treated the same way. Unreimbursed medical expenses above a threshold are typically divided proportionally. Private school tuition, when ordered, is divided proportionally. Effective January 1, 2026, unreimbursed expenses for psychiatric and psychological services and orthodontia are now included as reasonable medical expenses — a change from the prior guidelines, which excluded those categories unless the parties agreed otherwise.

Because daycare and childcare expenses and medical expenses in Pennsylvania child support cases are allocated separately from the base obligation, disputes over whether a particular cost qualifies and how it should be divided are common in Allegheny County support proceedings.

Deviating from the Guidelines

The guidelines create a rebuttable presumption — the calculated amount is presumed correct, but either party can seek a deviation. Courts may deviate from the guidelines where application of the formula would be unjust or inappropriate in a particular case. Grounds for deviation include the child’s unusual needs or extraordinary expenses, significant assets of the child, a very high combined parental income that results in an obligation exceeding the child’s actual needs, the reasonable needs of a parent’s other dependents, and other factors that make strict application inequitable.

Any deviation must be supported by specific findings on the record. A judge cannot simply reduce or increase support based on general equitable concerns — the departure from the guidelines must be justified by identified facts.

When Child Support Ends in Pennsylvania

Pennsylvania child support terminates when the child reaches age 18 and graduates from high school, or when the child turns 18 if they are not enrolled in high school. If the child turns 18 while still in high school, support continues until graduation or age 19, whichever comes first. Support does not automatically extend to cover college expenses — Pennsylvania courts generally do not order post-secondary educational support absent agreement between the parents, though the parties can agree to include college costs in a support agreement.

Support also terminates upon the child’s emancipation, marriage, military service, or death. A parent who believes support should terminate must petition the court — the obligation does not end automatically based on changed circumstances unless a court order reflects that change. For a full discussion of the age threshold, graduation extension, emancipation, and how to file a termination petition, see our page on when child support ends in Pennsylvania.

Modifying a Child Support Order in Pennsylvania

A child support order can be modified when there is a substantial and material change in circumstances — a significant change in either parent’s income, a change in the custody arrangement, a change in the child’s needs, or the availability of updated guidelines. The 2026 guideline update constitutes grounds for modification, but the modification is not automatic. A petition to modify the existing order must be filed with the domestic relations section of the court. The modified amount is effective from the date of filing, not from the date the guidelines changed. A parent who delays filing permanently loses the ability to recover the adjusted amount for prior months — Pennsylvania courts do not apply modifications retroactively beyond the filing date, and that lost time cannot be recaptured.

Enforcing Child Support in Pennsylvania

Pennsylvania has a robust enforcement mechanism for unpaid child support. Wage attachment — withholding support directly from the obligor’s paycheck — is standard in most support orders and does not require a separate enforcement action. Additional enforcement tools available under Pennsylvania law include interception of state and federal tax refunds, suspension of driver’s licenses and professional licenses, liens on real and personal property, bank account levies, reporting to credit bureaus, and contempt of court proceedings that can result in fines or incarceration. The Pennsylvania State Collection and Disbursement Unit processes and tracks payments in most cases.

A parent who is owed back child support — called arrears — may pursue enforcement independently or through the domestic relations section. Arrears do not disappear when the child reaches emancipation; the obligation to pay accumulated arrears continues until they are satisfied.

How the Child Support Process Works in Allegheny County

In Allegheny County, child support actions are handled through the Domestic Relations Section of the Court of Common Pleas. A support action begins when one party files a support complaint. Both parties receive notice and are required to submit financial disclosure documents — pay stubs, tax returns, and documentation of income and expenses — before the conference date.

The first proceeding is a conference before a conference officer. The conference officer reviews both parties’ income information, applies the guidelines, and calculates the presumptive support amount. If both parties accept the conference officer’s recommendation, a consent order is entered and the case is resolved. If either party disputes the recommended amount — because of a claimed deviation, a dispute over income, or a custody arrangement that affects the calculation — the matter is scheduled for a hearing before a hearing officer.

At the hearing, both parties can present evidence and testimony. The hearing officer issues a recommended order, which is subject to exceptions filed with the Court of Common Pleas judge. In most cases the matter is resolved at the conference stage. Complex cases involving self-employment income, business ownership, imputed income disputes, or significant custody disagreements are more likely to proceed to hearing. Orders are typically entered within 60 to 90 days of the initial filing in uncontested matters.