Pennsylvania child support guidelines
Pennsylvania uses the income-shares model, built on both parents’ net incomes and a statewide support schedule, with a distinctive shared-custody adjustment. This page explains the rules and links Pennsylvania’s official Child Support Estimator; it doesn’t compute your figure.
How the Pennsylvania guideline works
- Combine both parents’ monthly net incomes — gross minus allowable deductions (taxes, mandatory retirement, union dues, certain support obligations);
- Find the basic support obligation for that combined income and the number of children in the statewide schedule (Pa.R.C.P. 1910.16);
- Divide it between the parents in proportion to income;
- Add each parent’s share of child-care, health-insurance premiums, and unreimbursed medical expenses.
Because the schedule and adjustments interact, Pennsylvania provides an official estimator rather than a single percentage.
The 40% shared-custody rule
Pennsylvania’s most consequential adjustment is parenting-time-based and unusually precise. Once the paying parent reaches 40% or more of the annual overnights, a shared-custody adjustment under Rule 1910.16-4 reduces the basic obligation — at exactly 40% it falls to about 58% of the standard amount, and it keeps dropping as overnights increase, with a further offset when the higher earner also has the majority of custody time. This cliff at 40% is why custody-schedule details can swing a Pennsylvania number sharply.
The 2026 update, low-income floor, and modification
Pennsylvania updated its guidelines effective January 1, 2026 and raised the self-support reserve — the income a low-earning parent keeps for basic needs before support is calculated. That update is a material and substantial change, but orders don’t adjust automatically: a parent must file to modify. Support generally runs until the child turns 18 or graduates high school, whichever is later (longer for a child with a disability).
Use the official estimator
The Pennsylvania Child Support Program (Department of Human Services) publishes the official Estimator (linked above). The state calls it an estimate — the actual order is set by the court — but it applies the current guideline. This page only explains the model.
For a real case
The guideline amount is presumed correct but can be deviated from under the rules. For advice on your circumstances, consult a Pennsylvania family-law attorney.
Reviewed by Aqil Abbas Khan, Founder & Editor of ToolsNexus
This page is general information, not legal advice. Child support in Pennsylvania is set by Pennsylvania’s official guidelines, and the amount in any real case is determined by the court or the state child-support agency using the official worksheet — not by this page. Guideline figures, schedules, and adjustments change over time and depend on facts specific to your situation (each parent’s income, parenting time, health-insurance and childcare costs, and other factors a court may consider). Use the official Pennsylvania calculator for an actual estimate, and consult a licensed family-law attorney in Pennsylvania for advice about your circumstances. ToolsNexus is not a law firm and does not provide legal representation.
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Frequently asked questions
- How is child support calculated in Pennsylvania?
- Pennsylvania uses the income-shares model. It combines both parents' monthly net incomes, finds the basic child support obligation for that combined income and the number of children in the statewide support schedule (Pa.R.C.P. 1910.16), then divides it between the parents in proportion to their incomes. Child-care, health-insurance, and other expenses are added and shared the same way.
- Does Pennsylvania use net or gross income?
- Net income. Pennsylvania starts from monthly gross income from most sources and subtracts allowable deductions (taxes, mandatory retirement, union dues, and certain support obligations) to reach net income, which drives the guideline. It is not the same as your take-home pay figure.
- Does shared custody lower support in Pennsylvania?
- Yes, and the threshold is specific: when the paying parent has 40% or more of the annual overnights, a shared-custody adjustment under Rule 1910.16-4 reduces the basic obligation — at 40% it drops to roughly 58% of the standard amount, and it falls further as overnights rise. A small change in a custody schedule can move a Pennsylvania order more than a raise would.
- Were the Pennsylvania guidelines updated for 2026?
- Yes. Pennsylvania updated its support guidelines and raised the self-support reserve (the income a low-earning parent keeps for basic needs) effective January 1, 2026. The update itself counts as a material and substantial change, but orders do not adjust automatically — a parent must file a petition to modify.
- Until what age is support paid in Pennsylvania?
- Support generally continues until the child turns 18 or graduates from high school, whichever is later, and can continue for a child with a disability. It can end sooner if the child is emancipated. Use the official estimator for a figure and consult a Pennsylvania family-law attorney for a real case.