How is child support calculated in Pennsylvania?

Using the income shares model under Rule 1910.16-1: the parents' monthly net incomes are combined to determine the basic child support obligation from a statutory schedule, then apportioned based on each parent's percentage share of that combined income.

How does the apportionment work in practice?

If one parent's share of combined monthly net income is 60% and the other's is 40%, they're each responsible for that same percentage of the basic support obligation, calculated using either the chart or the schedule in Rule 1910.16-3.

What counts as net income for the calculation?

Monthly net income is calculated under Rule 1910.16-2, generally gross income minus mandatory deductions like taxes, FICA, and existing support obligations for other children, similar in concept to how other income-shares states define it.

How do I request a modification in Pennsylvania?

A petition for modification or termination must specifically state the material and substantial change in circumstances the request is based on. You can request review by contacting Domestic Relations directly with your case or docket number.

How is child support enforced in Pennsylvania?

Through PACSES, the statewide computer system Domestic Relations Sections use to track payments and enforce orders. PACSES is linked to government and private data sources to locate an obligor's income and assets, and can increase wage attachments, intercept tax refunds, place property liens, or suspend licenses for arrears.

Pennsylvania, United States

Pennsylvania Child Support: A Parent's Guide

How child support works in Pennsylvania, in plain English: the income shares guidelines, modification, and PACSES enforcement.

Legal sources reviewed: August 10, 2026

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In short: Pennsylvania uses the income shares model, combining both parents' net monthly incomes and apportioning the resulting obligation by each parent's percentage share. Modifications require showing a material and substantial change in circumstances, and enforcement runs through PACSES, the state's centralized child support tracking and enforcement system.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed Pennsylvania family law attorney.

What Pennsylvania generally provides

Under 231 Pa. Code Rule 1910.16-1, Pennsylvania's child support guidelines use the income shares model: the concept that a child of separated, divorced, or never-married parents should receive the same proportion of parental income they would have received had the parents lived together.

Important terminology

Monthly net income: the base figure for the calculation under Rule 1910.16-2, generally gross income minus mandatory deductions.
Basic child support schedule: the chart in Rule 1910.16-3 reflecting typical spending on children in intact families by combined income and number of children.
PACSES: the Pennsylvania Child Support Enforcement System, the statewide computer system used to track and enforce orders.

How the calculation works

The parents' monthly net incomes are combined to determine the basic child support obligation, then that obligation is apportioned based on each parent's respective share of the combined income. For example, if one parent's share of combined monthly net income is 60% and the other's is 40%, their obligations are calculated proportionally on that same basis.

The schedule or the chart

Pennsylvania retained a basic child support schedule alongside the chart format, either one can be used to find the parties' combined basic child support obligation for their combined income and number of persons being supported, both appearing together in Rule 1910.16-3.

Requesting or defending a modification

A petition for modification or termination must specifically state the material and substantial change in circumstances the request relies on, a general assertion that things have changed isn't enough on its own. You can contact your local Domestic Relations Section, or in some counties email PACSES directly with your Case ID or docket number, to start the review. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

PACSES is the statewide system Domestic Relations Sections use to monitor payments and enforce support orders, maintaining case, personal, and payment information, and electronically linked to government and private data sources to help locate an obligor's income and assets. Where arrears exist, PACSES can increase the wage attachment, intercept IRS tax refunds, establish a lien against property, or suspend a driver's, hunting, fishing, or professional license.

Common questions

What if my income has changed since the order was entered? File a modification petition specifically identifying the material and substantial change, rather than adjusting payments on your own, which can create arrears even if the change is real.

How quickly does PACSES act on a missed payment? Enforcement escalation generally follows the arrears building up rather than a single missed payment, but PACSES has broad data access to identify income sources quickly once enforcement is triggered.

What if my co-parent isn't paying? Contact your county's Domestic Relations Section, which works through PACSES to pursue wage attachment, tax refund interception, liens, or license suspension.

Practical considerations

Because Pennsylvania's modification standard specifically requires identifying the change in circumstances in the petition itself, gather documentation (pay stubs, termination notices, medical records) before filing rather than after, and confirm the specific requirements with a Pennsylvania family law attorney or your county's Domestic Relations Section. For the custody and relocation rules that often intersect with support, see the Pennsylvania custody guide.

Official Pennsylvania resources

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.