Pennsylvania Child Support Guidelines: Income, Obligation, and Adjustments

The Pennsylvania child support guidelines use an Income Shares Model: the court adds both parents’ monthly net incomes together, finds the total support obligation on a standardized schedule, and makes each parent responsible for the share that matches their percentage of the combined income. The schedule amount carries a rebuttable presumption that it is correct, so the calculation itself is what determines nearly every order.¹

How Monthly Net Income Is Calculated

Every number in a Pennsylvania support order starts with each parent’s monthly net income. The court begins with gross income from all sources. The statutory definition is broad: wages, salaries, bonuses, commissions, business income, interest, rents, royalties, dividends, retirement and pension benefits, Social Security, disability benefits, workers’ compensation, unemployment compensation, lottery winnings, insurance settlements, and essentially any other form of payment regardless of source.²

Gross income is ordinarily based on at least a six-month average of earnings, which smooths out seasonal work and one-time payments.³ To get to net income, the court subtracts:

Federal, state, and local income taxes based on the parent’s actual filing status and exemptions.
FICA: Social Security tax (6.2% of earnings up to the $184,500 wage base in 2026) and Medicare tax (1.45% on all earnings), for a combined employee rate of 7.65%.⁴
Mandatory (non-voluntary) retirement contributions required as a condition of employment.
Union dues.
Alimony or support payments already owed to a former spouse.

For self-employed parents, the court looks at Schedule C to separate real business expenses from personal draws. Tax-exempt income, like municipal bond interest or certain disability payments, is treated as more valuable than the same dollar amount of taxable wages because the parent keeps all of it.

Imputed Income for Voluntary Unemployment or Underemployment

A parent cannot cut their support obligation by quitting a job or taking a lower-paying one without good reason. When the court finds a parent voluntarily unemployed or underemployed, it imputes income equal to that parent’s earning capacity.³

Earning capacity is assessed from employment and earnings history, job skills, education, literacy, age, health, criminal record, the local job market, prevailing wage levels, and the parent’s record of actually looking for work. Imputed income cannot exceed what the parent could earn from one full-time position, and the court must state its reasons in writing or on the record.³

Imputation does not apply in every case. A parent caring for a very young child, dealing with a documented medical condition, or genuinely searching after an involuntary layoff may avoid it. Switching to lower-paid work without explanation, starting a business that conveniently shows little income, or having bank deposits that don’t match reported earnings are the patterns that invite closer scrutiny.

Looking Up the Basic Support Obligation

Once each parent’s monthly net income is set, the court adds them together and finds the combined figure on the basic child support schedule in Rule 1910.16-3. The schedule is a grid with combined monthly net income on the vertical axis (from $1,300 to $30,000) and the number of children on the horizontal axis. The dollar amount at the intersection is the total support both parents owe together, based on what intact families at that income level typically spend on their children.⁵

The base figure covers standard expenses like food, clothing, and shelter. Health insurance premiums, work-related childcare, and extraordinary medical costs are handled as separate adjustments on top of the schedule amount.

When Combined Income Exceeds $30,000 a Month

Above $30,000 in combined monthly net income the schedule stops, and Rule 1910.16-3.1 provides a formula. The base amounts and marginal percentages are:

One child: $3,749 plus 4.0% of combined monthly net income above $30,000.
Two children: $4,981 plus 4.0% of the excess.
Three children: $5,803 plus 4.7% of the excess.
Four children: $6,482 plus 5.3% of the excess.
Five children: $7,130 plus 5.8% of the excess.
Six children: $7,750 plus 6.3% of the excess.

The result cannot be lower than the order the court would have entered at exactly $30,000 of combined income. The court can adjust the preliminary figure up or down based on the child’s reasonable needs, the deviation factors described below, and the parents’ expense statements.⁶

Splitting the Obligation Between Parents

The schedule gives one combined total. The next step is dividing it. Each parent is responsible for the percentage of that total that matches their share of the combined net income. If one parent earns 60% of the combined income, that parent owes 60% of the basic obligation; the other parent owes 40%.⁷

In practice, the receiving parent is treated as spending their share directly on the child, and the paying parent transfers their share each month. Everything after this point either adds to or subtracts from that transfer amount.

Adjustments That Change the Final Number

Health Insurance Premiums

The paying parent has the initial responsibility to provide health insurance for the child when coverage is available at a reasonable cost. Reasonable cost means the paying parent’s share does not exceed 5% of their monthly net income and, combined with the basic support obligation and other additional expenses, does not exceed 50% of their monthly net income.⁸

If the paying parent carries the insurance, the other parent’s share of the premium is deducted from the monthly support payment. If the receiving parent carries it, the paying parent’s share is added. The court only allocates premiums for people who are parties to or subjects of the support order, and coverage paid entirely by an employer is not allocated at all.

Unreimbursed Medical Expenses

The first $250 per person per year in unreimbursed medical costs is already built into the basic schedule, so it is not accounted for separately. Annual unreimbursed medical expenses above $250 per person are split between the parents in proportion to their income shares.⁸

Work-Related Childcare

Childcare costs necessary for employment or vocational training are added to the total obligation and shared proportionally between both parents, so the custodial parent is not left absorbing the entire cost of working.

Substantial Shared Custody

If the paying parent has the child for at least 40% of overnights in a year (146 or more nights), a rebuttable presumption applies that the basic obligation should be reduced to reflect the direct costs that parent carries during their time.⁷

The reduction formula takes the paying parent’s percentage of overnights, subtracts 30 percentage points, and lowers that parent’s income share by the difference. If the paying parent has the child 45% of overnights and earns 65% of combined income, the 65% share drops by 15 percentage points (45 minus 30), leaving an adjusted share of 50%. The monthly transfer payment falls accordingly.

Deviating From the Guideline Amount

The guideline figure is presumed correct, but a court can deviate when applying it would be unjust or inappropriate. Any deviation must be documented on the record with the original calculated amount, the reason for the deviation, the factual findings supporting it, and the deviation amount.⁹

Grounds that commonly justify a deviation include payments for children from a different relationship that cut into the parent’s available income, extraordinary needs of the child such as private school tuition or specialized therapy, significant non-income assets like real estate or investment portfolios that don’t produce monthly cash flow, and unusual fixed expenses that make the standard figure genuinely unmanageable.

The parent seeking the deviation carries the burden. Vague claims of hardship rarely work. Courts expect documented evidence: actual expense records, medical bills, school invoices, or asset valuations.¹

How Long Support Lasts

Pennsylvania parents are liable for the support of unemancipated children who are 18 or younger.² Support continues until the child turns 18 or graduates from high school, whichever comes later. A child who graduates at 17 still receives support until their 18th birthday; a child who turns 18 during senior year continues to receive support through graduation.

Support can end earlier if the child becomes emancipated by marriage, military enlistment, or moving out to live independently. Arrears stop accruing on the date of emancipation.²

Support can also extend past 18 in narrow situations. A parent may remain liable for an adult child with a severe physical or mental disability that prevents self-support. Separately, a court may order one or both parents to contribute to postsecondary educational costs, but that obligation generally cannot extend past the student’s 23rd birthday, and the court must consider whether the order would cause the parent undue financial hardship.²

Changing an Existing Order

Support orders don’t adjust automatically when circumstances change. To change the amount, a parent files a petition for modification with the Domestic Relations Section in the county that issued the order. The petition must specifically describe the material and substantial change in circumstances that justifies recalculating.¹⁰

Qualifying changes include a significant increase or decrease in either parent’s income, a change in custody, new or revised guidelines, and the discovery of previously unknown income or assets. Informal agreements between the parents to pay a different amount are not enforceable, and skipping the formal process lets arrears pile up under the old order.

Timing matters. A modification is effective from the date the petition is filed, not from the date circumstances actually changed and not from the date the court finally rules. If your income drops in January but you wait until April to file, you owe the original amount through April. A narrow exception allows retroactivity to a date before filing if the petitioner was prevented from filing by a significant physical or mental disability, misrepresentation by the other party, or another compelling reason, and filed promptly once the obstacle was removed.¹¹

Once a petition is on file, it cannot be withdrawn without both parties’ consent or court approval, and the court can modify or terminate the order regardless of which parent filed, based on whatever the current evidence shows.¹⁰

1
Unified Judicial System of Pennsylvania. Pennsylvania Rules of Civil Procedure Rule 1910.16-1 – Amount of Support, Support Guidelines
2
Pennsylvania General Assembly. Pennsylvania Consolidated Statutes Title 23 Chapter 43 – Support Matters
3
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-2 – Support Guidelines, Calculation of Monthly Net Income
4
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
5
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-3 – Support Guidelines, Basic Child Support Schedule
6
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-3.1 – Support Guidelines, High-Income Cases
7
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-4 – Support Guidelines, Calculation of Support Obligation, Formula
8
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-6 – Support Guidelines, Major Financial Issues
9
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.16-5 – Support Guidelines, Deviation
10
Pennsylvania Code. Pennsylvania Code 231 Rule 1910.19 – Support, Modification, Termination
11
Legal Information Institute. Pennsylvania Code 231 Rule 1910.17 – Support Order, Effective Date, Change of Circumstances