Calculation is client-side, income figures are never transmitted or stored.
How Utah Child Support Is Calculated
- Add both parents' monthly adjusted gross income to get combined income.
- If the paying parent's OWN individual income is at or below a per-child-count threshold (about $1,960/month for one child, up to about $2,450 for six), Utah's Low-Income Table (81-6-305) applies directly using that parent's income alone -- this is the full obligation, not prorated.
- Otherwise, look up the combined income in the Base Combined Child Support Obligation Table (81-6-304), and each parent's share is their percentage of combined income.
- This calculator models the standard sole-custody case only. Joint physical custody and split custody use different worksheets and are not modeled here.
- Above $100,000/month combined income, Utah's tables do not extend automatically -- courts determine the amount case-by-case.
Utah Child Support Worksheet Walkthrough
Example: Parent A earns $4,000/month, Parent B earns $2,000/month (combined $6,000). There are two children, who live primarily with Parent B.
- Parent A's own income ($4,000) is above the $2,250 Low-Income Table threshold for 2 children, so the combined-income table applies.
- Combined monthly income: $4,000 + $2,000 = $6,000.
- Base Combined Child Support Obligation Table at $6,000 combined, two children: about $745.
- Parent A's income share: $4,000 / $6,000 = 66.7%.
- Parent A pays: $745 x 66.7% = $497/month.
How This Calculator Works — Formula & Constants
Source: Utah State Legislature — Utah Code Title 81, Chapter 6, Part 3 (Child Support Tables) · Calcul déterministe — no AI, no arbitrary estimate.
Constants used
| Constant | Value | Source |
|---|
Formula
base_obligation = schedule_lookup(combined_income, children)
share_B = parentB_income / combined_income
total_obligation = base_obligation + childcare_cost + health_insurance_cost
obligation_B = total_obligation × share_B
Deterministic calculation based on Utah's official guideline schedule table. Verify against Utah's official calculator for a court-ready figure.
FAQ
How is child support calculated in Utah?
Add both parents' monthly adjusted gross income to get combined income. If the paying parent's OWN individual income is at or below a per-child-count threshold (about $1,960/month for one child, up to about $2,450 for six), Utah's Low-Income Table (81-6-305) applies directly using that parent's income alone -- this is the full obligation, not prorated. Otherwise, look up the combined income in the Base Combined Child Support Obligation Table (81-6-304), and each parent's share is their percentage of combined income. This calculator models the standard sole-custody case only. Joint physical custody and split custody use different worksheets and are not modeled here. Above $100,000/month combined income, Utah's tables do not extend automatically -- courts determine the amount case-by-case.
What is Utah's Low-Income Table?
Utah Code 81-6-305 sets a separate schedule based on the paying parent's OWN individual income (not combined with the other parent's) when that income is below a per-child-count threshold -- roughly $1,960/month for one child up to $2,450/month for six. Below that threshold, the Low-Income Table amount is the full obligation directly; above it, the standard combined-income table (81-6-304) applies instead.
What is the minimum child support amount in Utah?
$30/month, which applies at the very lowest individual income levels under the Low-Income Table (81-6-305).
Does joint physical custody change Utah child support?
Yes -- when parents share physical custody, Utah uses a different worksheet that factors in each parent's overnights, rather than the standard sole-custody calculation this calculator uses.
Methodology & Source
Formula model: ut low income or shares. Effective 2023-01-01, guideline version 2023-UT-v1, last reviewed 2026-07-13.
Official source: Utah State Legislature — Utah Code Title 81, Chapter 6, Part 3 (Child Support Tables) (Utah Code §§ 81-6-304, 81-6-305).
This calculator models Utah's standard sole-custody calculation (81-6-304/305) only. It does not model joint physical custody (a worksheet using each parent's overnights, Utah Code 81-6-201 et seq.) or split custody. Above $100,000/month combined adjusted gross income, Utah's tables do not extend automatically -- courts determine the amount case-by-case.
Guideline figures transcribed from the primary source above and cross-checked against Utah's official calculator/worksheet for multiple test scenarios — see our verification methodology.