Co-Parenting Expense Rules in Pennsylvania (2026)

How Pennsylvania Handles Shared Child Expenses

Pennsylvania uses the Income Shares Model for child support. The core idea is straightforward: a child of separated or divorced parents should receive the same proportion of parental income that they would have received if the family were still intact. Both parents' incomes are combined, a basic support obligation is read from a statewide schedule, and that obligation is then divided between the parents in proportion to their respective incomes.

The rules governing this system are found primarily in Pa.R.C.P. 1910.16-1 through 1910.16-7 (Title 231 of the Pennsylvania Code, Chapter 1910). These rules were most recently updated effective January 1, 2026, marking the first revision in four years. The 2026 amendments generally increase support amounts across the board to reflect rising costs of living.

Pennsylvania's approach is structured in layers. First, a basic support obligation is determined from the guidelines schedule. Then, specific additional expenses — childcare, health insurance premiums, and unreimbursed medical costs exceeding a statutory threshold — are allocated on top of basic support. Finally, the court may deviate from the calculated amount if specific factors warrant an adjustment. Understanding each layer is essential for co-parents trying to figure out who owes what.

What Basic Support Covers — The Guidelines Schedule

The foundation of Pennsylvania child support is the Basic Child Support Schedule found at Pa.R.C.P. 1910.16-3. This schedule is a large table: combined monthly net income runs down the left side, and the number of children runs across the top. The intersection gives the total basic support obligation for the family.

What counts as "monthly net income"

Under Pa.R.C.P. 1910.16-2, monthly net income includes wages, salaries, bonuses, commissions, self-employment income, interest, dividends, pension and retirement payments, Social Security benefits, and most other forms of recurring income. From gross income, the court deducts federal, state, and local income taxes, FICA contributions, mandatory union dues, and alimony paid to the other party.

Notably, income from a new spouse or live-in partner is not included in the parent's net income for guideline purposes (though it may be relevant as a deviation factor — more on that below).

What basic support is meant to cover

The basic support amount encompasses the child's ordinary, recurring living expenses: housing, food, clothing, basic transportation, and standard educational costs associated with public school. The schedule is constructed using economic data about what intact families at various income levels typically spend on their children. When you look up an amount on the schedule, it already accounts for these everyday costs.

This means that routine expenses you incur during your parenting time — groceries, school supplies, everyday clothing — are considered covered by the basic support obligation. You generally cannot seek separate reimbursement for them.

The 30% parenting-time assumption

An important built-in assumption: the basic schedule presumes that the obligor (the parent paying support) has the children approximately 30% of the time and makes direct expenditures on their behalf during those periods. Variable costs like food and entertainment that fluctuate with parenting time are already adjusted into the schedule amounts based on this 30% assumption, as stated in the commentary to Pa.R.C.P. 1910.16-4.

If the obligor has substantially more parenting time — 40% or above — a custody adjustment applies. At 40% parenting time the obligor receives a 10% reduction in support owed, increasing incrementally to a 20% reduction at 50% parenting time. This adjustment is codified in Pa.R.C.P. 1910.16-4(c).

Even with a 50/50 custody arrangement, it is still possible for one parent to owe support to the other. The rule provides a maximum obligation cap so that the obligee does not receive a larger share of the combined income than the obligor retains.

Additional Expenses Beyond Basic Support

On top of the basic support obligation, Pennsylvania law requires certain expenses to be allocated separately between the parents. These are governed by Pa.R.C.P. 1910.16-6 and are added to (or, in some cases, offset against) the basic support amount.

The three primary categories of additional expenses are:

1. Childcare costs necessary for a parent to maintain employment or pursue education/training for employment
2. Health insurance premiums for the child
3. Unreimbursed medical expenses exceeding $250 per child per year

Each of these is allocated between the parents in proportion to their respective monthly net incomes — the same proportional split used for the basic support obligation itself. This means if Parent A earns 60% of the combined income and Parent B earns 40%, additional expenses are split 60/40.

How additional expenses work in practice

Unlike the basic support amount (which is a single monthly figure read from a schedule), additional expenses are calculated based on actual costs incurred. This creates a need for ongoing tracking and communication between co-parents. One parent pays the expense, documents it, and the other parent reimburses their proportional share. This is where many co-parenting disputes originate — not over the legal framework, but over the practical challenge of tracking, reporting, and settling up.

Medical and Health Expenses

Pennsylvania's treatment of medical expenses has two distinct components: health insurance premiums and unreimbursed medical costs.

Health insurance premiums

Under Pa.R.C.P. 1910.16-6(b), the cost of health insurance premiums attributable to the child is allocated between the parents proportionally. If a parent carries a family plan through their employer, the relevant cost is the difference between the individual plan premium (or self-only coverage) and the plan that includes the child. Only this incremental cost is subject to allocation — not the full family plan premium.

When the obligee (the parent receiving support) pays the child's health insurance premium, the obligor's share of that premium is added to the basic support obligation. Conversely, when the obligor carries the insurance, the obligee's share is deducted from the basic support obligation. This ensures that whichever parent pays the premium up front is credited appropriately.

Unreimbursed medical expenses — the $250 threshold

This is one of the most commonly misunderstood aspects of Pennsylvania child support. Under Pa.R.C.P. 1910.16-6(c), the first $250 per year per child of unreimbursed medical expenses is considered built into the basic support schedule. This means the parent incurring those expenses absorbs them without reimbursement from the other parent.

Only unreimbursed medical expenses exceeding $250 per year per child are subject to proportional allocation. In the year a support order is initially entered, or any period covering less than a full year, the $250 threshold is pro-rated.

What counts as a medical expense

The definition under the rule includes:

• Insurance co-payments and deductibles
• Orthodontia
• Prescription medications
• Dental care
• Vision care
• Mental health treatment and therapy
• Medical equipment and supplies

The rule explicitly excludes chiropractic services from the definition of allocable medical expenses.

Unreasonable medical expenses

Not every medical expense is automatically reimbursable. Under the rule, an unreimbursed medical expense may be deemed unreasonable if it was avoidable and incurred solely by the party requesting reimbursement. Examples cited in the rule include:

• Charges for missed office visits
• Purchasing name-brand medications when suitable generic alternatives are available
• Denial of insurance coverage due to failure to comply with plan requirements
• Non-emergency out-of-network expenses when in-network options were available
• Excessive supplies beyond what is medically necessary

This "unreasonable expense" provision is an important safeguard. It means co-parents cannot run up medical costs carelessly and expect automatic reimbursement. The expense must be reasonable and necessary.

Childcare Expenses

Under Pa.R.C.P. 1910.16-6(a), reasonable childcare expenses incurred by either parent due to employment or education/training for employment are added to the basic support obligation and allocated proportionally between the parents.

What qualifies

The childcare must be work-related. Babysitting for a social event or occasional convenience generally does not qualify. The expense must be tied to the parent's need to work or pursue education that enhances their employment prospects. Common qualifying expenses include:

• Daycare center fees
• After-school care programs
• Before-school care programs
• Summer childcare or day camp (when work-related)
• Nanny or in-home childcare costs

Summer camp

Summer camp expenses often fall into a gray area. If the camp serves primarily as childcare while a parent works, it is more likely to qualify as an allocable expense under Rule 1910.16-6(a). If the camp is more recreational or educational in nature — a specialized sports camp, arts program, or sleepaway camp — it may be treated as a discretionary expense and would need to be addressed through agreement between the parents or as a deviation factor.

The net cost rule

When calculating childcare expenses for allocation, courts look at the net cost after accounting for any tax benefits. Federal and state childcare tax credits can reduce the effective cost of childcare, and the allocated amount should reflect what the parent actually pays after those credits.

Education and Extracurricular Activities

Pennsylvania's guidelines do not automatically include private school tuition or extracurricular activity costs in the basic support obligation or the standard additional expenses. These are handled differently.

Private school tuition

Private school tuition is not a presumptive expense in Pennsylvania child support. However, courts can order one or both parents to contribute to private school costs if it is in the best interests of the child. Factors courts consider include:

• Whether the child was already enrolled in private school before the separation
• The family's standard of living during the marriage
• Whether the parents previously agreed to private schooling
• Whether the child has special educational needs that are better served by a private institution
• The parents' ability to pay

Private school tuition can be addressed as a deviation factor under Pa.R.C.P. 1910.16-5 or as an additional expense allocated by agreement or court order. If both parents agree to private school, the tuition is typically allocated proportionally based on income. If they disagree, the parent seeking private school enrollment generally bears the burden of convincing the court that it is appropriate.

Note that Pennsylvania eliminated mandatory child support for post-secondary education (college tuition) through the holding in Blue v. Blue, 616 A.2d 628 (Pa. 1992), and subsequently through legislative action. Support obligations extend only through high school.

Extracurricular activities

Extracurricular activities — sports leagues, music lessons, dance classes, art programs, academic tutoring — are generally considered discretionary expenses in Pennsylvania. They are not automatically covered by the basic support obligation, nor are they mandatory additional expenses under Rule 1910.16-6.

For extracurriculars to become a shared expense, parents typically need either:

1. Mutual agreement — both parents agree to the activity and to split the cost proportionally
2. A court order — one parent petitions the court to include the expense, arguing it serves the child's best interests, and the court may order it as a deviation or as part of the overall support order

Courts consider whether the activity is in the child's best interest and whether it is reasonable given the parents' combined financial resources. A parent who unilaterally enrolls a child in an expensive activity without the other parent's agreement risks being solely responsible for the cost.

Best practice: Before enrolling your child in any activity that costs more than a trivial amount, send your co-parent a written message (text or email) outlining the activity, the cost, and the proposed split. Get their agreement in writing. This protects both parents and avoids disputes down the road.

Deviation Factors Under Rule 1910.16-5

The guidelines produce a presumptive support obligation, but Pennsylvania courts recognize that no formula can perfectly account for every family's circumstances. Pa.R.C.P. 1910.16-5 authorizes the trier of fact (judge or hearing officer) to deviate from the calculated guideline amount — either upward or downward — based on specific factors.

The complete list of deviation factors under Rule 1910.16-5 is:

1. Unusual needs and unusual fixed obligations — This is the broadest factor and can encompass a wide range of circumstances: a child with a disability requiring specialized care, a parent with extraordinary debt obligations arising from the marriage, or other atypical financial demands.

2. A party's other support obligations — If a parent also pays support for children from another relationship, this may warrant a downward deviation (though multiple-family situations also have their own specific rules under Pa.R.C.P. 1910.16-7).

3. Other household income — Income from a new spouse or live-in partner is not included in the parent's own net income for guideline calculations, but it may be considered as a deviation factor. If one parent now lives with a high-earning partner who contributes substantially to household expenses, the court may consider this in adjusting the support obligation.

4. The child's age — Older children generally cost more (higher food consumption, more expensive clothing, increased activity costs), which may justify an upward deviation.

5. The parties' relative assets and liabilities — If one parent has substantially greater assets (investments, real estate, inheritance) or substantially greater liabilities, the court may adjust accordingly.

6. Medical expenses not covered by insurance — While unreimbursed medical expenses above $250 are already allocated under Rule 1910.16-6, truly extraordinary medical costs (e.g., ongoing treatment for a serious illness or disability) may warrant additional deviation.

7. The parties' and the child's standard of living — The court aims to allow the child to share in the standard of living of both parents. If one parent's lifestyle is substantially different from what the guideline amount would support, deviation may be appropriate.

8. Duration of the marriage — This factor applies primarily in spousal support or alimony pendente lite cases, measured from the date of marriage to the date of final separation.

9. Other relevant and appropriate factors, including the child's best interest — This catch-all provision gives courts flexibility to consider anything that does not fit neatly into the other categories. Private school tuition, extraordinary extracurricular costs, and unique family circumstances can all fall under this factor.

A deviation must be supported by specific findings on the record. The court cannot simply decide the guideline amount "feels wrong" — it must identify which factor or factors justify the adjustment and explain the reasoning.

Practical Calculation Example

To make this concrete, here is a step-by-step example of how Pennsylvania child support works for a family with two children.

The scenario

• Parent A (non-custodial parent / obligor): Gross annual income of $75,000
• Parent B (custodial parent / obligee): Gross annual income of $50,000
• Two children, ages 8 and 12
• Parent A has the children approximately 30% of the time (standard assumption)
• Parent B pays health insurance for the children: incremental premium of $200/month
• Monthly childcare (after-school program): $600/month
• Unreimbursed medical expenses last year: $900 total for both children

Step 1: Calculate monthly net income

After deducting federal, state, and local taxes, FICA, and other mandatory deductions under Pa.R.C.P. 1910.16-2:

• Parent A monthly net income: approximately $4,688 (estimated)
• Parent B monthly net income: approximately $3,333 (estimated)
• Combined monthly net income: $8,021

Step 2: Determine income shares

• Parent A's share: $4,688 / $8,021 = 58.4%
• Parent B's share: $3,333 / $8,021 = 41.6%

Step 3: Look up basic support obligation

Using the Basic Child Support Schedule under Pa.R.C.P. 1910.16-3, for a combined monthly net income of approximately $8,021 with two children, the basic support obligation is approximately $1,818/month (based on the 2026 updated schedule; actual amount depends on the precise income bracket).

Step 4: Allocate basic support

Since Parent B is the custodial parent and Parent A is the obligor:

• Parent A's share of basic support: $1,818 x 58.4% = $1,062/month

This is the base amount Parent A owes to Parent B each month.

Step 5: Add childcare expenses

Monthly childcare of $600 is allocated proportionally:

• Parent A's share: $600 x 58.4% = $350
• Parent B's share: $600 x 41.6% = $250

Parent A's share ($350) is added to the support obligation.

Step 6: Adjust for health insurance

Parent B pays $200/month in incremental health insurance premiums for the children. Parent A's proportional share:

• Parent A's share: $200 x 58.4% = $117

This is also added to the support obligation.

Step 7: Allocate unreimbursed medical expenses

Total unreimbursed medical expenses: $900 for the year for two children. The $250/child/year threshold applies:

• Threshold for two children: 2 x $250 = $500
• Allocable amount: $900 - $500 = $400/year, or approximately $33/month

Parent A's share: $33 x 58.4% = $19/month

Step 8: Total monthly obligation

Parent B handles the remaining shares of additional expenses (childcare, medical) since they are the parent incurring those costs directly.

Important notes about this example

• These are estimates. Actual amounts depend on the precise income figures, the current schedule amounts, and individual tax situations.
• If Parent A had 40% or more parenting time, the custody adjustment under Rule 1910.16-4(c) would reduce the basic support amount.
• Either parent can request a deviation under Rule 1910.16-5 if circumstances warrant it.
• The unreimbursed medical allocation is ongoing — expenses fluctuate month to month, so the actual monthly amount will vary.

Modification of Support Orders

Pennsylvania child support orders are not permanent. They can be modified when circumstances change, governed by 23 Pa.C.S. Section 4352 and Pa.R.C.P. 1910.17.

Substantial change in circumstances

Either parent can file a petition to modify a support order at any time by demonstrating a substantial change in circumstances. Common qualifying changes include:

• Significant income change — job loss, promotion, career change, disability
• Change in custody arrangement — a shift in the percentage of parenting time
• Change in the child's needs — new medical condition, educational needs, aging into more expensive life stages
• Change in childcare costs — starting or ending daycare, changes in after-school care needs
• Remarriage or cohabitation — while a new partner's income is not directly included in the calculation, it may affect the deviation analysis
• Incarceration — under 23 Pa.C.S. Section 4352, incarceration (except for nonpayment of support) constitutes a material and substantial change that may warrant modification or termination of a support order

Automatic three-year review

Under 23 Pa.C.S. Section 4352, upon request of either parent, the support order must be reviewed at least once every three years. During this review, the court applies the current statewide guidelines without requiring proof of a change in circumstances. This is particularly relevant now, given the 2026 guideline update — parents with orders calculated under the 2022 schedule may benefit from requesting a review.

The 2026 update does not apply automatically

This is a critical point many parents miss: the January 2026 guideline updates do not automatically change existing support orders. To benefit from the updated schedule amounts (which generally increased), you must file a petition to modify your order. The court will then recalculate using the current schedule.

Retroactive modification

Modification is generally prospective — it takes effect from the date the petition is filed, not retroactively. However, under 23 Pa.C.S. Section 4352, retroactive modification may be granted if the petitioner was prevented from filing earlier due to significant physical or mental disability, misrepresentation by the other party, or other compelling reasons, and the petitioner filed promptly once the impediment was removed.

Documentation and Tracking Best Practices

Pennsylvania courts expect parents to maintain clear records of shared expenses. When disputes arise — and they frequently do — the parent with organized documentation has a significant advantage. Key documentation practices include:

• Keep every receipt for childcare, medical expenses, and any other costs you expect to share
• Maintain a running log of unreimbursed medical expenses to track when you cross the $250/child annual threshold
• Save communication records — texts, emails, or app messages where expenses are discussed or agreed upon
• Track health insurance premiums and keep records of the incremental cost attributable to covering your children
• Document parenting time accurately, especially if you are near the 40% threshold where the custody adjustment applies

Spreadsheets and text message chains become unwieldy quickly, particularly when expenses accumulate over months. Missing a receipt or losing track of the running medical expense total can mean losing out on reimbursement you are legally entitled to.

What to Do When Your Co-Parent Won't Pay

If your co-parent refuses to pay their proportional share of allocable expenses, Pennsylvania law provides escalating remedies:

1. Written demand — Start with a clear, documented request. Include the receipt, the amount owed, the proportional calculation, and a reference to the applicable rule (Pa.R.C.P. 1910.16-6). Many disputes arise from misunderstanding rather than willful refusal.

2. Domestic Relations Section — Most Pennsylvania counties have a Domestic Relations Section within the Court of Common Pleas that handles support matters. You can file a petition through this office. The process typically begins with a conference before a conference officer or hearing officer, which functions similarly to mediation.

3. Petition for contempt — If there is an existing court order specifying expense-sharing obligations and your co-parent violates it, you can file a petition for civil contempt. The court may impose sanctions including fines, attorney fee awards, and in extreme cases, incarceration.

4. Wage attachment — Pennsylvania permits income withholding for support obligations. If your co-parent consistently fails to pay, the court can order their employer to deduct support payments directly from their wages under 23 Pa.C.S. Section 4348.

Key Statutes and Resources

• Pa.R.C.P. 1910.16-1 — Support Guidelines Overview — The foundational rule establishing the income-shares model
• Pa.R.C.P. 1910.16-2 — Calculation of Monthly Net Income — Defines what counts as income and allowable deductions
• Pa.R.C.P. 1910.16-3 — Basic Child Support Schedule — The schedule table used to determine basic support amounts
• Pa.R.C.P. 1910.16-4 — Calculation of Support Obligation Formula — The formula including custody time adjustments
• Pa.R.C.P. 1910.16-5 — Deviation — Factors authorizing departure from guideline amounts
• Pa.R.C.P. 1910.16-6 — Additional Expenses Allocation — Rules for childcare, health insurance, and unreimbursed medical expenses
• Pa.R.C.P. 1910.16-7 — Multiple Family Obligations — Rules when a parent has support obligations for children from multiple relationships
• 23 Pa.C.S. Section 4352 — Continuing Jurisdiction Over Support Orders — Modification, three-year review, and retroactive adjustment provisions
• Pennsylvania Courts — Self-Help: Support — Free resources and forms from the Pennsylvania court system
• PA DHS Child Support Program — Pennsylvania Department of Human Services child support enforcement portal