Yes: When There Is a Substantial Change in Circumstances
Support orders are modifiable under Rule 1910.19(a) when there is a material and substantial change in circumstances — a significant change in either party's income, a significant change in the custody schedule, or other changes affecting the support obligation. Support orders are designed to be adjustable as life circumstances change.
Critical rule: A modification is effective from the date the petition is filed — not the date the circumstances changed. If your income dropped three months ago and you haven't filed, you are still obligated at the old amount for those three months. File promptly when circumstances change.
Common Reasons for Filing
- Job loss or significant reduction in income (involuntary)
- Significant income increase by either party
- Substantial change in the custody schedule (affecting the custody adjustment)
- Child's emancipation approaching
- Change in health insurance obligations
- Significant change in childcare costs
- The 2026 guidelines change itself — may constitute a material and substantial change when the new guideline amount differs significantly from the current order
Rule 1910.19(c): What Filing Can Do
Under Rule 1910.19(c), when a modification petition is filed, the court can modify the order in any direction regardless of who filed. If you file to reduce what you pay, the order can be increased at the hearing depending on the evidence. If you file to increase what you receive, the award can go lower. This cuts both ways — and it has surprised clients on both sides.
Before filing a modification petition, analyze what the likely outcome would be given both parties' current income and circumstances. If you are uncertain, understanding the potential outcome before you file is more valuable than learning it at the hearing.
How to File
Support modifications can be filed online through the Pennsylvania Child Support website, in person at the main support office (Manor Building, 564 Forbes Avenue), or at the satellite offices. The petition describes the changed circumstances. A new conference is scheduled, followed by a hearing if the parties do not agree at the conference level. The same Allegheny County procedures apply — conference by phone, then in-person hearing if needed.
Want your number reviewed by an attorney? A calculator applies the guideline. It cannot weigh earning capacity, self-employment or cash income, deviations, the date of separation, or how custody overnights shift the result. A focused session runs your figures, reviews them as an attorney rather than a formula, and frames your next step.
See how your number is decided →