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Child Support Payment Calculator
Calculate payments from an already established monthly child-support amount and the unpaid balance over a period.
- Unpaid balance (+) or excess payments (−), $
- 1,000
- Total due including opening arrears, $
- 6,000
How the calculation works
Amount due = monthly obligation × full months + opening arrears. Balance = amount due − payments made.
Inputs
- Established monthly amount, $
- Full months
- Opening arrears, $
- Payments made in the period, $
Calculation details
Federal law requires state child-support guidelines; there is no single federal award formula. Enter the amount from the applicable order or agreement.
This does not determine legal liability, interest, penalties, indexing, or credit for overpayments. Partial months and changed orders require separate calculation.
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Updated: 2026-10-02