# Child Support Cost-sharing Worksheet — United States

> Allocate an already determined guideline obligation in a simple income-shares scenario. It is not a 50-state child-support calculator and does not supply a court schedule. USD planning view; stated limitations apply.

Page: https://askcalculators.com/us/child-support/
Definition: https://askcalculators.com/us/child-support/definition.json
JSON Schema: https://askcalculators.com/us/child-support/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/child-support/?parentA=4000&parentB=3000&baseObligation=1000&childcare=300&health=100&aDirect=0&aAdjustment=0&rulesConfirmed=0

## Inputs
- parentA: Parent A monthly guideline-adjusted income; type=money; required; default=4000; min=0; max=1000000000000
- parentB: Parent B monthly guideline-adjusted income; type=money; required; default=3000; min=0; max=1000000000000
- baseObligation: Combined obligation from the verified state guideline; type=money; required; default=1000; min=0; max=1000000000000
- childcare: Eligible monthly childcare; type=money; required; default=300; min=0; max=1000000000000
- health: Eligible child health-insurance cost; type=money; required; default=100; min=0; max=1000000000000
- aDirect: Eligible credit for Parent A direct payments; type=money; required; default=0; min=0; max=1000000000000
- aAdjustment: Verified reduction/credit from custody adjustment; type=money; required; default=0; min=0; max=1000000000000
- rulesConfirmed: Applicable jurisdiction rules and entered amounts independently verified; type=checkbox; optional; default=false

## Outputs
- aShare: Parent A income share; format=percent
- bShare: Parent B income share; format=percent
- combined: Combined entered support costs; format=currency
- aContribution: Parent A modeled contribution after entered credits; format=currency; primary

## Formula
A share = A adjusted income / combined adjusted income. A contribution = max(0, combined eligible costs × A share − verified direct credits − verified adjustment).

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.