How Child Support Amounts Are Calculated in Pennsylvania

Pennsylvania uses a formula based on both parents' income and custody time

Pennsylvania does not set a flat dollar amount for child support. Instead, the state uses the Income Shares Model, which calculates support based on what percentage of household income each parent contributes and how much time the child spends with each parent. The same calculation applies whether you are the parent paying support or receiving it.

The formula starts with the combined gross income of both parents, subtracts certain costs (like existing child support obligations and health insurance premiums), and then divides the remaining amount between parents based on their income percentages and custody arrangement. A parent with higher income or less custody time typically pays more.

Because the calculation depends on individual circumstances — income level, number of children, custody split, and other factors — two families in Pennsylvania will rarely have the same support amount, even if their children are the same age.

Key Takeaways

• Pennsylvania calculates child support using each parent's gross income, the number of children, and the percentage of time each parent has custody.
• The state publishes income guidelines each year that show the combined income level at which the formula caps out; amounts above that level are calculated differently.
• Child support continues until the child turns 18 or graduates high school, whichever is later, unless the child is still in high school after turning 18.
• Either parent can request a modification if income changes by 10 percent or more, or if custody arrangements change significantly.
• The Pennsylvania Domestic Relations Section publishes worksheets and guidelines that show how the calculation works for different income and custody scenarios.

How the income calculation works

The first step is determining gross income for each parent. Gross income includes wages, salary, bonuses, self-employment income, rental income, Social Security benefits, unemployment compensation, and certain other sources. It does not include means-tested benefits like TANF (Temporary information for Needy Families) or SNAP (food information).

From gross income, the calculation subtracts specific costs: existing child support obligations to other children, spousal support (alimony) paid to an ex-spouse, and the cost of health insurance for the child in question. The result is the net income used in the formula.

Both parents' net incomes are added together to get combined parental income. Pennsylvania then looks up this combined income on the state's current Child Support Guidelines table to find the base support amount. This table is updated each year and published by the Pennsylvania Supreme Court.

Once the base amount is found, it is divided between parents based on each parent's percentage of the combined income. The parent with less custody time typically pays their percentage of the base amount to the other parent.

What happens when income exceeds the guideline cap

Pennsylvania's income guidelines table only goes up to a certain combined income level, which changes yearly. In 2024, that cap is $163,000 combined gross income, but this figure increases annually based on wage index data.

When combined income exceeds the cap, the court does not stop calculating support. Instead, the judge considers additional factors: the standard of living the child would have had if the parents remained together, the financial resources of each parent, the time each parent spends with the child, and any other relevant circumstances. The judge has discretion to order support above the guideline amount or to order no additional support beyond what the guideline amount would have been.

This means high-income cases are less predictable than cases where combined income falls within the guideline range, because the judge weighs multiple factors rather than following a single formula.

How custody time affects the amount

Pennsylvania recognizes that the parent with whom the child spends more time has direct expenses (food, utilities, activities) that the other parent does not. The calculation accounts for this by adjusting the support obligation based on parenting time percentage.

If one parent has the child 100 percent of the time and the other has no overnight custody, the paying parent's obligation is higher than if they split time 50-50. If parents share custody equally (roughly 50-50), the parent with higher income still pays support, but the amount is lower than it would be in a sole-custody scenario.

The percentage of time is usually calculated as the number of overnights each parent has per year. A parent who has the child every other weekend plus one weeknight typically has around 30 percent of overnights. A parent with every other weekend only has roughly 26 percent.

Support amounts for multiple children

When parents have more than one child together, Pennsylvania calculates support for all children as a group, not individually. The formula produces a total support amount, which is then divided among the children if the parents later separate or if one child ages out of support.

If a parent has child support obligations to children from different relationships, those existing obligations reduce the income available for calculating new support. For example, if a parent already pays $400 per month for a child from a previous relationship, that $400 is subtracted from gross income before calculating support for a second child.

The order in which support obligations are established can matter in high-income cases, because earlier obligations are protected and later ones may be reduced to account for the earlier payments.

Pennsylvania's 2024 income guidelines table

Combined Parental Income	One Child	Two Children	Three Children	Four Children	Five or More Children
$1,000	$163	$263	$330	$380	$415
$2,000	$325	$525	$660	$760	$830
$3,000	$488	$788	$990	$1,140	$1,245
$5,000	$813	$1,313	$1,650	$1,900	$2,075
$10,000	$1,625	$2,625	$3,300	$3,800	$4,150

This table shows the base support obligation before adjustment for parenting time. The actual amount one parent pays depends on dividing this base by income percentage and adjusting for custody. The table is updated annually by the Pennsylvania Supreme Court and published in the Pennsylvania Bulletin.

When support ends and how to request a change

Child support continues until the child turns 18, unless the child is still enrolled in high school. If a child is still in high school after turning 18, support continues until the child graduates or turns 19, whichever comes first. Support also ends if the child becomes emancipated (legally independent) before age 18, though this is uncommon.

Either parent can request a modification of the support amount if circumstances change. Pennsylvania law allows modification if income changes by 10 percent or more, if custody time changes significantly, if health insurance costs change, or if other material circumstances change. A modification does not happen automatically — the parent seeking the change must file a request with the court.

The court will not modify support retroactively to the date of the income change unless the requesting parent filed the modification request within a reasonable time. If you wait years to request a modification, the court may only adjust support going forward, not reimburse you for the overpayment during the waiting period.

Frequently Asked Questions

Does Pennsylvania have a minimum child support amount?

Pennsylvania does not set a flat minimum, but the guideline table starts at very low combined income levels. If both parents have minimal income, the calculated support amount may be very small — sometimes $25 to $50 per month — but it is not automatically waived. A judge can order no support only if both parents' combined income falls below the lowest guideline level and the judge finds that support would be unjust or inappropriate.

What counts as income for child support purposes?

Gross income includes wages, salary, bonuses, self-employment income, rental income, Social Security, unemployment benefits, workers' compensation, disability benefits, and pension income. It does not include TANF, SNAP, SSI (Supplemental Security Income), or other means-tested information. If you are self-employed, income is calculated as gross receipts minus ordinary business expenses.

Can child support be modified if a parent loses their job?

Yes, but only if you file a modification request with the court. Support does not automatically decrease when income drops. If you lose your job, you should file a modification petition promptly and bring documentation of the job loss. The court will not usually reduce support retroactively unless you filed the request within a reasonable time after the income change.

How is child support enforced if a parent does not pay?

Pennsylvania's Domestic Relations Section can intercept tax refunds, garnish wages, suspend driver's licenses, and file liens against property. The state also operates a child support enforcement agency that pursues unpaid support on behalf of the receiving parent. If support is ordered through the court, the paying parent must make payments through the state's payment system, which creates a record of all payments.

Does child support change if parents share custody 50-50?

Yes, but the amount is lower than in a sole-custody case. The parent with higher income still pays support to the parent with lower income, but the base amount is adjusted downward because both parents have direct expenses. The exact reduction depends on how the 50-50 time is structured and each parent's income percentage.