Updated for 2026 guidelines
Pennsylvania Child Support Arrears Calculator 2026
Unpaid support in Pennsylvania stays exactly what it is: the missed payments. No interest rate quietly runs on the balance, and this page is honest about the one narrow path where a rate could attach.
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
Check a Pennsylvania arrears balance
Estimated arrears with interest: $5,000.00
Interest of $0.00 under 42 Pa.C.S. 8101; 41 P.S. 202.
| Line item | Amount |
|---|---|
| Arrears principal42 Pa.C.S. 8101 (interest on judgments at the lawful rate from verdict/award or judgment date) (PA General Assembly (palegis.us)) | $5,000.00 |
| Interest not computed: no verified numeric rate (42 Pa.C.S. 8101; 41 P.S. 202)Support arrears do not automatically accrue interest. The 6% legal rate (41 P.S. 202) attaches as post-judgment interest under 42 Pa.C.S. 8101 when arrears are reduced to a money judgment; application to support arrearages is discretionary and official-confirmation-required (confirm 23 Pa.C.S. ch. 43 enforcement provisions before publishing any PA interest calculation).42 Pa.C.S. 8101 (interest on judgments at the lawful rate from verdict/award or judgment date) (PA General Assembly (palegis.us)) | $0.00 |
| Arrears principal plus interest42 Pa.C.S. 8101 (interest on judgments at the lawful rate from verdict/award or judgment date) (PA General Assembly (palegis.us)) | $5,000.00 |
Assumptions
- Accrual period expressed as 12 month(s); partial months prorate.
- No verified numeric interest rate for this state; interest shown as 0 and the result is an estimate of principal only.
Estimate only. The court or state agency calculation controls.
Pennsylvania arrears interest under 42 Pa.C.S. 8101; 41 P.S. 202; rules last reviewed 2026-08-06.
How arrears work in Pennsylvania
Arrears are support payments that came due and were not paid. In Pennsylvania every payment becomes a fixed debt on its due date, tracked on the state PACSES system through the county domestic relations section that runs the case.
Here is the part most calculators get wrong: Pennsylvania support arrears do not automatically accrue interest. The support rules add no rate to the balance while it sits with domestic relations. A parent who owes $10,000 in missed payments owes $10,000, plus whatever new payments keep coming due.
Pennsylvania does have a legal rate of 6 percent a year, and 42 Pa.C.S. section 8101 applies it to money judgments. So if support arrears were reduced to a money judgment, that judgment could bear the 6 percent rate. Whether courts actually apply it to support arrearages is discretionary and enforcement-dependent, and we have not been able to confirm the practice against an official source. Until that is confirmed, this tool will not pretend to compute it.
The balance is firm in the other direction too. Under 23 Pa.C.S. section 4352, overdue support becomes a lien, and arrears cannot be modified retroactively: a court can change support going forward from the filing date of a petition, but it cannot erase payments that already came due.
- Automatic interest on arrears
- None; the support rules add no rate to the balancesource
- Legal rate on money judgments
- 6% per year (42 Pa.C.S. § 8101; 41 P.S. § 202)source
- Application to support arrears
- Discretionary and not officially confirmed; not computed by this toolsource
- Retroactive modification
- Barred; arrears cannot be wiped out for past periods (23 Pa.C.S. § 4352)source
How to use this estimate
Enter the arrears principal and the period. Because Pennsylvania adds no automatic interest, the tool reports the principal back with a zero-interest line and the reason why. That is the honest arithmetic, and it doubles as a check on any calculator that shows a Pennsylvania balance growing on its own.
If a court has entered a money judgment on your arrears and ordered interest, the 6 percent legal rate would apply to that judgment. That is a case-specific court decision; read your judgment paperwork rather than assuming it happened.
The county domestic relations section keeps the ledger that counts. Payments through income withholding, tax refund offsets, and direct payments all move the PACSES balance in ways a single-number estimate cannot track.
What this estimate includes
- The arrears principal you enter, unchanged
- A zero-interest line stating that Pennsylvania adds no automatic rate
- The statutory citations for the legal rate, in case a judgment applies to you
What it leaves out
- Any invented interest on arrears; no rate runs automatically in Pennsylvania
- Judgment interest a court may have ordered in your specific case
- Partial payments, offsets, and the running PACSES ledger
- New support that keeps accruing under the current order
Pennsylvania arrears FAQs
Do Pennsylvania child support arrears earn interest?
Not automatically. The support rules add no interest to an arrears balance while the county domestic relations section collects it. This is different from states like New York or many others that publish an arrears interest rate. The balance grows only when new payments are missed.
What is the 6 percent rate people mention?
Pennsylvania’s legal rate of interest, set at 6 percent a year by 41 P.S. § 202 and applied to money judgments by 42 Pa.C.S. § 8101. It belongs to judgments generally, not to support ledgers. It could touch support arrears only if a court reduces them to a money judgment, and applying it there is a discretionary, case-specific step we have not confirmed as routine practice.
Can old arrears be reduced or forgiven?
A court cannot rewrite the past. Under 23 Pa.C.S. § 4352, support can be modified only from the date a modification petition was filed, so payments that already came due stay owed. The person owed the money can agree to compromise arrears owed to them, and the state has separate processes for arrears assigned to it, but no judge can retroactively lower a past-due balance.
Is unpaid support a lien in Pennsylvania?
Yes. Overdue support becomes a lien by operation of law under 23 Pa.C.S. § 4352, which means it can attach to real estate and follow the paying parent until resolved. That is one reason the balance matters even when no interest runs on it.
Why does this calculator show zero interest?
Because that is the verified answer. Our data pack for Pennsylvania records no numeric arrears rate, and the tool is built to refuse to invent one. A calculator that shows Pennsylvania arrears compounding is applying another state’s rule or making the number up.
Where do I find my real arrears balance?
From the county domestic relations section handling your case or through the Pennsylvania child support program’s online portal. The PACSES ledger reflects every charge, payment, and adjustment, and it is the figure courts and enforcement actions use.
Official sources
Official sources last verified: .
- 42 Pa.C.S. 8101 (interest on judgments at the lawful rate from verdict/award or judgment date)
PA General Assembly (palegis.us) Last checked
- 23 Pa.C.S. 4352 (continuing jurisdiction over support orders; liens for overdue support; (e) no retroactive modification of arrears)
PA General Assembly (palegis.us) Last checked
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
Changelog: page first published with the no-automatic-interest rule and the money judgment nuance. Material changes are dated in the update log.