Pennsylvania Child Support Estimator
The Pennsylvania Child Support Program website provides a free child support estimator that can give you an approximate idea of what the guideline support amount might be in your case. This is a useful starting point — but it has significant limitations that are worth understanding before you rely on it.
What the Estimator Cannot Tell You
The PA Child Support Estimator is a reasonable starting point but will not account for:
- Proper income determination — Net income for support purposes is more complex than what most people enter. Self-employment income, business expenses, bonuses, commissions, stock compensation, rental income, investment income, and imputed earning capacity all require specific analysis. The free calculator does not walk you through these.
- The 2026 guideline changes — The new schedule effective January 1, 2026 removed the 30% custody assumption built into the prior schedule. Depending on the custody arrangement, the interaction between the new schedule and custody time may produce results that differ significantly from the estimator.
- Deviation arguments — There are statutory grounds for deviating from the guideline amount in either direction. A lawyer knows what those grounds are and how to document and argue them effectively.
- Additional expenses — Childcare, unreimbursed medical expenses, and extracurricular activities are added to the basic support obligation during calculation. The estimator may not fully account for these.
- Spousal support interaction — When both child support and spousal support/APL are involved, the calculation uses a different percentage (30% vs. 40%) for spousal support. The interaction between both types of support requires coordinated calculation.
- High-income cases — For combined net monthly income above $30,000, a separate formula applies. The estimator has limits.
The firm uses the most current court-equivalent software — the same type used by Allegheny County domestic relations officers — which produces detailed reports reflecting the new 2026 guidelines, specific deviation arguments, and all income sources. The output is substantially more reliable than a free online estimator for planning purposes.
Filing for Child Support in Allegheny County
Filing for child support is free. You do not need a lawyer to file. The complaint can be filed online through the PA Child Support website, in person at the main support office (Manor Building, 564 Forbes Avenue, Fifth Floor, Monday–Friday 8:00 AM–2:00 PM), at the Mt. Lebanon satellite office (250 Mt. Lebanon Blvd), or at the Penn Hills satellite office (12000 Frankstown Road).
Support begins accruing from the date the complaint is filed. If you have a basis for support and have been waiting to file, that delay costs you — support is not awarded retroactively before the filing date.
Requesting a Modification Online
If you have a substantial change in circumstances — job loss, reduction in hours, disability, significant income change — and need to modify an existing support order, modification petitions can be filed online using Form OM-501 through the PA Child Support website.
Reminder: a support modification takes effect from the date the petition is filed, not the date the circumstances changed. Delay in filing has a direct financial cost.