Pennsylvania child support is calculated using a formula based on both parents' income, the number of children, and custody time

Pennsylvania uses the Income Shares Model to calculate child support. This means the state adds both parents' incomes together, finds what percentage of that combined income goes to child support based on the number of children, then divides that amount between the parents based on how much each one earns. A parent with 60% of the combined income pays 60% of the support obligation.

The calculation starts with net monthly income — gross income minus taxes, Social Security, and certain other deductions. Income includes wages, self-employment earnings, rental income, unemployment benefits, and some other sources. The court can also count income a parent is capable of earning if they are unemployed or underemployed without good reason.

Once the court knows both parents' net incomes, it looks up the combined income in Pennsylvania's Child Support Guidelines table to find the base support amount. That amount is then split between the parents based on their income percentages. The parent with primary custody (or the parent who spends fewer overnight hours with the child) typically receives the payment from the other parent.

Key Takeaways

  • Pennsylvania calculates child support by combining both parents' net monthly income, looking up the base amount in the state's guidelines table, and splitting that amount based on each parent's percentage of the combined income.
  • The calculation includes wages, self-employment income, rental income, and unemployment benefits, and the court can count income a parent could earn even if they are not currently working.
  • Custody time affects the calculation — the parent with fewer overnight hours with the child typically pays support to the other parent.
  • Child support orders can be changed if there is a substantial and continuing change in circumstances, such as a job loss or significant income increase.
  • The Pennsylvania Domestic Relations Section of the Court of Common Pleas handles child support cases, and the state has an enforcement agency called the Pennsylvania Child Support Enforcement Program.

How income is counted and what gets excluded

Pennsylvania counts most forms of income in the child support calculation. This includes W-2 wages, self-employment income, bonuses, commissions, overtime, rental income, interest and dividend income, Social Security benefits (for the child, not the parent), workers' compensation, unemployment compensation, and disability benefits. Income from new jobs is typically counted after 30 days of employment.

The state excludes certain items: child support or spousal support the parent is already paying to someone else, income taxes and Social Security taxes, health insurance premiums, and unreimbursed work-related expenses. Some courts also exclude court-ordered restitution or fines, though this varies by judge.

If a parent is self-employed, the court uses net self-employment income (business income minus business expenses). If a parent owns a business, the court may look at business tax returns, profit-and-loss statements, and bank records to determine actual income. A parent cannot artificially lower income by taking unnecessary business losses or transferring money to someone else.

How custody time changes the amount owed

Pennsylvania's guidelines assume one parent has primary custody and the other has visitation. If the parents split custody more evenly — typically defined as each parent having at least 40% of overnight hours per year — the calculation changes. The parent with fewer overnights still pays, but the amount is reduced because that parent is covering some costs directly (food, housing, activities) when the child is with them.

The state counts overnights, not daytime hours. If a child spends every weekend with one parent but weekdays with the other, the weekend parent's overnight count determines their custody percentage. A 50-50 split means roughly 182 overnights per year with each parent.

If neither parent has primary custody — for example, if the child lives with a grandparent — both parents may still owe support. The calculation then depends on the specific custody arrangement and what the court orders.

When and how child support payments are made

Child support is typically ordered to begin on the first day of the month following the court order, though a judge can order it to start earlier. Payments are usually made monthly, and the paying parent sends money to the Pennsylvania Child Support Enforcement Program or directly to the receiving parent, depending on the court order.

Many child support orders include an income withholding order, which means the paying parent's employer deducts the support amount from their paycheck automatically. This is the most common method and protects both parents — the paying parent has proof of payment, and the receiving parent knows the money is coming regularly.

If the paying parent is self-employed or does not have a regular employer, they may be ordered to pay by check, money order, or electronic transfer. Some parents use the state's online payment system. Late payments can result in interest charges, and repeated non-payment can lead to contempt of court charges, driver's license suspension, or wage garnishment.

How long child support lasts and when it can end

In Pennsylvania, child support continues until the child turns 18, or until they graduate from high school, whichever is later — but not beyond age 19. If the child is still in high school after turning 18, support continues through the end of that school year or until they turn 19, whichever comes first.

Support can end earlier if the child is emancipated (legally recognized as self-supporting), joins the military, or is adopted by someone other than the paying parent's spouse. It does not automatically end when a child turns 18 if they are still in high school.

Support can also be extended beyond age 18 if the child has a disability that prevents them from being self-supporting. The paying parent can request this extension, and the court decides based on the child's condition and the parents' ability to pay.

Changing a child support order

A child support order can be changed if there is a substantial and continuing change in circumstances. This means the change must be significant enough and likely to last long enough to affect the calculation. Examples include a job loss, a major increase or decrease in income, a change in custody time, or a change in health insurance costs.

Either parent can file a petition to modify the order with the Domestic Relations Section of the Court of Common Pleas in the county where the order was issued. The parent requesting the change must show the new circumstances and provide recent income documentation, such as pay stubs, tax returns, or a letter from an employer.

The court can also review child support orders on its own every three years, or more often if requested. If the calculated amount under current guidelines differs by 10% or more from the current order, the court may modify it without waiting for a parent to request a change.

Enforcement and what happens if support is not paid

The Pennsylvania Child Support Enforcement Program handles collection and enforcement. If a parent falls behind on payments, the program can take several actions: intercept tax refunds, place a lien on property, suspend a driver's license, report the debt to credit agencies, or seek contempt of court charges.

A parent who owes back child support (called arrears) can face wage garnishment, where the court orders the employer to send a portion of the paycheck directly to the state program. The amount garnished cannot exceed 50% of disposable income if the parent is supporting another family, or 60% if they are not.

If a parent is incarcerated for non-payment, they can petition the court to reduce or suspend the obligation based on their inability to pay. However, arrears continue to accumulate during incarceration unless the court specifically suspends them. Once released, the parent is responsible for both current support and the back payments owed.

Frequently Asked Questions

Does Pennsylvania count child support I am already paying to another child?

Yes. If you are paying child support for another child, that amount is deducted from your net income before the court calculates what you owe for the current case. You must provide proof of the existing order and documentation that you are actually paying it.

What if the paying parent is unemployed or in prison?

The court can still order child support based on the parent's earning capacity — what they could earn if they were working. If a parent is incarcerated, the court may suspend the obligation temporarily, but arrears continue to build unless the judge specifically stops them. Once released, the parent owes both current support and back payments.

Can child support be ordered retroactively to before the court case started?

Yes. Pennsylvania allows child support to be ordered back to the date the case was filed, or sometimes earlier if the court finds it appropriate. This is called retroactive support and is separate from the ongoing monthly obligation that begins after the order is signed.

What if both parents have equal custody time?

The calculation changes when each parent has at least 40% of overnight hours. The parent with the higher income still pays, but the amount is reduced to account for the direct costs each parent covers when the child is with them. The exact reduction depends on both parents' incomes and the specific overnight split.

Can child support be waived or forgiven?

Parents cannot straightforward agree to waive child support on their own. Any agreement to reduce, suspend, or eliminate support must be approved by the court. The judge will review the agreement to make sure it is in the child's best interest before allowing it.