PA Child Support Guidelines Calculator

Pennsylvania child support follows a statutory formula under Pa.R.Civ.P. 1910.16-1 through 1910.16-7. Courts start from the guideline amount and may deviate after weighing the factors in the rule, and they must explain any deviation. Knowing how the calculation works tells you what to expect and what you owe or can claim.

This page walks through the guidelines step by step. For our site's interactive legal calculators, see Legal Calculators.

How Pennsylvania Calculates Support

Pennsylvania uses an income shares model. The logic is straightforward: the child's support obligation is proportional to each parent's income. If both parents earn equally, they share support equally. If one parent earns much more, they pay more.

Here is the framework:

Step 1: Determine each parent's gross income. This includes salary, wages, bonuses, self-employment income, rental income, Social Security retirement and disability benefits, and various other sources, as defined in 23 Pa.C.S. § 4302. Gross income is the starting point before deductions.

Step 2: Calculate monthly net income. Pennsylvania's guidelines are based on each parent's monthly net income, not gross. Pa.R.Civ.P. 1910.16-2(c) sets the list of deductions from gross income, and the court deducts only those items unless the rules provide otherwise: federal, state, and local income taxes; FICA (Social Security and Medicare) and self-employment taxes; unemployment compensation taxes and local services taxes; mandatory union dues; non-voluntary retirement contributions; and alimony actually paid to the other party. The result is the combined monthly net income used for the guideline calculation.

Step 3: Look up the guidelines schedule. Pennsylvania's rules include a basic child support schedule (Pa.R.Civ.P. 1910.16-3) that lists a dollar obligation indexed by the parents' combined monthly net income and the number of children. It is not a flat percentage of income. The obligation rises with income, but at a declining rate, so the effective percentage falls as income climbs. For two children at $10,000 combined monthly net income, for example, the schedule sets the basic obligation at $2,452 per month (about 24.5 percent), not a fixed 30 percent.

Step 4: Calculate each parent's proportional share. Each parent owes a share of the basic obligation in proportion to their share of combined net income. If Dad's net income is 60 percent of the combined total and Mom's is 40 percent, Dad is responsible for 60 percent of the support obligation and Mom for 40 percent. This proportional split applies whether one parent has primary custody or custody is shared.

Step 5: Account for custody time and health insurance. If one parent has primary custody, the non-custodial parent pays cash support to the custodial parent. If custody is shared, support may be offset. Health insurance costs are factored in separately.

The Guidelines Schedule

Here is how the schedule works with a real example.

Combined monthly net income: $10,000. Two children. The basic child support schedule in Pa.R.Civ.P. 1910.16-3 sets the basic obligation at $2,452 per month for this income level. The schedule is a dollar table, not a flat percentage; this $2,452 figure happens to work out to about 24.5 percent of combined net income, and that percentage shrinks at higher incomes.

If Dad's net income is $7,000 and Mom's is $3,000 (Dad is 70 percent of combined net income), Dad's share of the $2,452 obligation is $1,716.40. Mom's share is $735.60.

If Dad has primary custody, Mom pays Dad $735.60 per month. If custody is shared (let us say Dad has the kids 40 percent of the time), the obligation is adjusted under Pa.R.Civ.P. 1910.16-4 because Dad is already spending money on the kids when he has them.

For higher incomes (combined monthly net income above $30,000), the basic schedule stops and the court applies the separate formula in Pa.R.Civ.P. 1910.16-3.1, which adds a percentage of the income above $30,000 to a fixed base amount. These cases can be less predictable because support above the schedule turns more on the parties' specific circumstances, but the formula is the starting point. The court may then adjust the result up or down based on the child's reasonable needs, subject to a presumptive minimum (Pa.R.Civ.P. 1910.16-3.1(a)(2)(iii)).

What Counts as Income

Income includes obvious sources: W-2 wages, 1099 self-employment income, business income. It also includes bonuses, overtime, tips, rental income, interest and dividend income, capital gains, and distributions from business interests.

Whether a gift or inheritance counts as income depends on the facts. Income from an interest in an estate or trust counts. Under 23 Pa.C.S. § 4302 and Pa.R.Civ.P. 1910.16-2(a)(8), other entitlements to money or lump sum awards count as income without regard to source, including lottery winnings, income tax refunds, insurance compensation or settlements, and awards or verdicts. Ongoing payments (like disability benefits, workers' compensation, or spousal support) also count.

If someone is voluntarily unemployed or underemployed (meaning they could earn more but choose not to), a court can impute income based on earning capacity. If a parent quits a $80,000 job to avoid child support, the court may order support based on the $80,000 they could still earn.

This gets contentious where one parent changes jobs for reasons unrelated to support avoidance. For an existing order, the court does not reduce support because a parent voluntarily takes a lower paying job or leaves work (Pa.R.Civ.P. 1910.16-2(d)(1)). For an initial order or a modification, the court imputes earning capacity when a parent fails to obtain or maintain appropriate employment, after weighing factors such as child care responsibilities, health, and the local job market (Pa.R.Civ.P. 1910.16-2(d)(4)).

Adjustments and Deviations

Healthcare costs: If one parent carries health insurance for the children, that premium is factored in. If neither carries insurance, the cost of independent coverage is split. Uninsured medical expenses are typically split based on the same income proportions.

Childcare costs: If the custodial parent incurs childcare expenses to work, the court must allocate reasonable child care expenses that the parties pay to maintain employment or appropriate education, generally in proportion to their net incomes (Pa.R.Civ.P. 1910.16-6(a)(1)).

Shared custody offsets: When a child spends 40 percent or more of the annual overnights with the paying parent, a rebuttable presumption arises that the paying parent is entitled to a reduction, because that parent is directly supporting the children during that time. Equal shared custody has its own rule in Pa.R.Civ.P. 1910.16-4.

Extraordinary expenses: Private school, specialized medical or dental care, camps, or activities beyond typical childhood expenses may be added on top of the guideline support.

Deviations from guidelines: A judge may deviate from the guideline amount and must state the reasons and findings on the record or in writing (Pa.R.Civ.P. 1910.16-5(a)). The rule lists the reasons the court may consider (Pa.R.Civ.P. 1910.16-5(b)), including unusual needs and unusual fixed obligations, the parent's other support obligations, other household income, the child's age, the parties' assets and liabilities, medical expenses not covered by insurance, the standard of living of the parties and the child, and other relevant factors. Very high incomes are handled under the separate rule in Pa.R.Civ.P. 1910.16-3.1, and a low-income obligor is protected by the self-support reserve.

Duration of Support

Child support continues until the later of two events: the child turning 18 or the child graduating from high school. If the child is still in high school after turning 18, support continues until the child graduates from high school (or the child is otherwise emancipated). There is no automatic age-19 cutoff. So if your child turns 18 but is still a junior in high school, you continue paying until graduation, even if the child is still in high school at 19. If the child graduates from high school before turning 18, support still runs until the child turns 18.

Support does not automatically extend to college. If parents want to agree to college support, they can, but Pennsylvania does not require it unless the order specifically includes it. Support can also end earlier on the child's marriage or emancipation.

As a general rule, support ends at 18 or high-school graduation, whichever is later. There is no separate age-19 ceiling. Beyond that general rule, under 23 Pa.C.S. § 4321(3), parents may be liable for the support of children who are 18 or older, so a court can order continued support of an adult child in limited circumstances (for example, a physical or mental condition that prevents the child from being self-supporting).

Modification: When Circumstances Change

Child support can be modified if there has been a substantial and continuing change in circumstances. This includes a significant change in either parent's income, a change in custody, loss of employment, or a new child by either parent.

The standard under Pa.R.Civ.P. 1910.19 is a material and substantial change in circumstances, and the change must be continuing rather than temporary. There is no fixed statutory percentage, but as a practical matter an income change that moves the guideline amount meaningfully is what tends to support a modification. Normal or temporary earnings fluctuations do not support an adjustment. A substantial continuing involuntary loss of income, such as a lay-off or termination, may (Pa.R.Civ.P. 1910.16-2(d)(2)).

Either parent can petition for modification. If the payor's income dropped 15 percent due to an industry downturn and that change is expected to be long-term, a court will likely modify downward. If the payor's income fell because of a voluntary choice, such as taking a lower paying job or quitting, the court does not adjust the order for it (Pa.R.Civ.P. 1910.16-2(d)(1)).

A modification is ordinarily effective from the date the modification petition is filed, not from when circumstances actually changed. So file promptly if your situation changes. Under Pa.R.Civ.P. 1910.17(a) and 23 Pa.C.S. § 4352(e), a court may reach back to a date before the filing in one narrow situation: the petitioner was precluded from filing by a significant physical or mental disability, a misrepresentation by another party, or other compelling reason, and filed promptly once no longer precluded.

Enforcement

If someone does not pay child support, enforcement mechanisms are serious. Contempt of court carries jail time. Wage attachments (garnishment) can be ordered on the obligor's paycheck. Professional licenses can be suspended. State and federal tax refunds can be intercepted and applied to arrears. If arrears become substantial, a warrant for arrest can be issued.

Pennsylvania's child support enforcement agency is aggressive. They pursue collections on behalf of custodial parents who apply for services. If you have court-ordered support and the other parent is not paying, you can file a petition for contempt with the judge or let the enforcement agency pursue it.

Conversely, if you owe support and fall behind, addressing it quickly is crucial. You can seek modification if your circumstances genuinely changed, or work out a payment plan. Contempt judgments and license suspensions are serious consequences.

Calculating Your Own Obligation

If you know both parents' gross income and the number of children, you can estimate support using the guideline percentage and table. For precise calculation, you need actual deductions, healthcare costs, custody percentage, and any extraordinary expenses. An attorney can run the numbers and tell you what Pennsylvania guidelines require.

Many custody agreements include child support language that deviates from guidelines if both parents agree and the court approves. If you are negotiating a settlement, understanding guidelines gives you a baseline. You can agree to more or less, but the court will scrutinize substantial deviations and may reject them if they appear contrary to the child's best interest.

For more on how support and custody interact, see Child Support and Spousal Support (Alimony). If your circumstances have changed since an order was entered, Modifying Custody and Support Orders When Circumstances Change walks through the modification process.

Legal and factual content on this page was last verified: Sep. 2026. If you are reading this significantly after that date, confirm key provisions with current statute text or contact our office.