Pennsylvania uses an income shares model combining both parents’ net incomes. A basic support obligation is determined from a schedule. Each parent pays a pro rata share. A custody offset of 10–20% applies when the obligor has 40%+ overnights (146+ nights). Above $30,000/month combined, the Melzer v. Witsberger deviation formula applies.
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Pennsylvania calculates child support using the Income shares model established under Pa.R.C.P. 1910.16-3. This is a statutory formula that leaves limited room for judicial discretion on the base calculation amount, ensuring consistency and predictability for families across the state.
Basic obligation from schedule based on combined net income and children. Each parent's share = pro rata of combined income. Net income = gross minus federal/state/local taxes (PA 3.07% + local EIT up to 3.5%), FICA, mandatory retirement, health insurance (self), union dues, prior support.
The calculation begins with determining each parent's net disposable income, which includes virtually all sources of income minus taxes, mandatory payroll deductions, and certain hardship deductions. The court then applies the statutory formula using the time each parent has primary physical responsibility for the children and the applicable income allocation brackets.
Beyond the base formula amount, Pennsylvaniarequires additional contributions for mandatory add-on expenses. These typically include childcare costs necessary for the custodial parent's employment or education, uninsured healthcare expenses for the children, and in some cases, educational and travel costs. These add-ons are split between parents in proportion to their respective incomes.
Primary statute: Pa.R.C.P. 1910.16-3
Approximate percentages of combined net: 1 child ~17%, 2 ~25%, 3 ~30%, 4 ~33.5%, 5+ ~36.5%.
40%+ overnight custody threshold (146+ nights) triggers 10–20% offset.
Self-support reserve: $1,255/month (updated January 2026).
High-income cases: above $30,000/month combined = Melzer v. Witsberger deviation formula.
Add-ons: childcare, children's health insurance, unreimbursed medical, private school (if agreed or ordered).
PA state pensions (SERS/PSERS) require ADRO (Approved Domestic Relations Order), not QDRO.
Guidelines updated January 1, 2026 with new self-support reserve and schedule amounts.
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Residency Requirement
6 months state residency
Mandatory Waiting Period
No mandatory waiting period for mutual consent (§3301(c)); 1-year separation for no-fault §3301(d)
No-Fault Ground
Mutual consent (90-day cooling off) or 1-year separation (§3301(c)/(d))
State Income Tax
Flat 3.07% (plus local earned income tax of 1–3.5% depending on municipality)
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Pennsylvania uses the Income shares model under Pa.R.C.P. 1910.16-3. Pennsylvania uses an income shares model combining both parents’ net incomes. A basic support obligation is determined from a schedule. Each parent pays a pro rata share. A custody offset of 10–20% applies when the obligor has 40%+ overnights (146+ nights). Above $30,000/month combined, the Melzer v. Witsberger deviation formula applies.
Key factors include both parents' income, the number of children, custodial time share, mandatory add-on expenses (childcare, health insurance), and any applicable deductions. Approximate percentages of combined net: 1 child ~17%, 2 ~25%, 3 ~30%, 4 ~33.5%, 5+ ~36.5%.
Yes. Either parent can request a modification if there has been a material change in circumstances, such as a significant change in income, custody arrangements, or the needs of the child. The court will recalculate support using the same statutory formula.
Basic obligation from schedule based on combined net income and children. Each parent's share = pro rata of combined income. Net income = gross minus federal/state/local taxes (PA 3.07% + local EIT up to 3.5%), FICA, mandatory retirement, health insurance (self), union dues, prior support.
Get a personalized child support calculation based on Pennsylvania's actual statutory formula.
Start My Free PennsylvaniaEstimate →This tool provides educational estimates based on Pennsylvania family law and does not constitute legal advice. Child support calculations are approximations of the statutory formula and may differ from court-ordered amounts. Consult a licensed Pennsylvania family law attorney before making decisions. Primary statute: Pa.R.C.P. 1910.16-3.