How to calculate Alimony Child Support in Utah

Quick takeaways

• Utah child support starts with Utah Code § 78B-12-301 et seq. using the base combined child support obligation table tied to the parents’ combined adjusted gross income (AGI).
• Utah “alimony” (spousal support) is addressed separately under Utah Code § 30-3-5(8), and DocketMath’s alimony-child-support calculator helps you run child support and alimony together in one place.
• A single universal “claim-type” variation rule was not found in the materials provided, so this guide uses the general/default workflow:

  • Base child support table first (combined AGI under § 78B-12-301)
  • Then apply adjustments supported by the calculator inputs (e.g., parenting-time/time-share)
• Use DocketMath to keep your assumptions consistent—small changes to AGI, parenting time, or health/child-care adjustments (if applicable in the tool) can noticeably change the output.

Inputs you need

Before you start in DocketMath (tool: /tools/alimony-child-support), gather the items that let the calculator apply Utah’s US-UT rules to your scenario.

A. Income inputs (for the child support table)

Utah’s statutory child support formula begins with parents’ combined adjusted gross income:

• Your adjusted gross income (AGI)
• Your ex-spouse/partner’s adjusted gross income (AGI)
• Any income components you’re treating as part of AGI for your case

Statute anchor (Utah Code): Utah’s child support rule requires that the base child support award be determined using the base combined child support obligation table in § 78B-12-301 based on the parents’ combined adjusted gross income.

B. Parenting-time / custody-related inputs (if your scenario uses them)

Utah child support calculations often use parenting-time to allocate shared costs and determine adjustments from the base obligation.

Common inputs DocketMath may ask you to provide include:

• Estimated number of overnights (or another time-share measure)
• Any schedule assumptions you’re using for the run

C. Alimony inputs (spousal support)

Utah spousal support is governed by Utah Code § 30-3-5(8).

DocketMath’s combined workflow typically expects alimony-related figures such as:

• The alimony amount you want to model (or inputs that produce an alimony estimate, depending on the scenario configuration inside the tool)
• Any alimony parameters the tool lets you set

Because alimony is highly fact-specific, treat the calculator as a scenario engine: change an input and observe how the output shifts.

D. Outputs you want

Decide what you want to compare before you run the tool:

• Monthly child support amount
• Monthly alimony amount (or how alimony changes the combined monthly picture)
• Any totals or combined figures the tool displays

How the calculation works

Think of DocketMath’s alimony-child-support process for Utah (US-UT) as two related parts running together:

1. Child support: built from the Utah statutory base table
2. Alimony: handled under Utah’s separate spousal support statute

Step 1: Calculate base child support using Utah’s table rule

Under Utah’s child support framework:

• The base combined child support obligation table in Utah Code § 78B-12-301 determines the starting point.
• Table selection is driven by the parents’ combined adjusted gross income.
• Utah’s statutory instruction (as provided) is clear:
  “The base combined child support obligation table in Section 78B-12-301 shall be used to determine the base child support award based on the parents' combined adjusted gross income.”
  Source: Utah Legislature (Title 78B, Chapter 12, § 78B-12-301)

In practice, your workflow in DocketMath is essentially:

1. Enter each parent’s AGI
2. Combine them to create combined AGI
3. Let the tool select the correct table band/row for the base obligation
4. Apply any further calculator-supported adjustments that depend on the other inputs you provided

Step 2: Apply parenting-time / schedule adjustments (when included)

After the base table provides a starting point, parenting-time can adjust the obligation depending on how the worksheet is designed.

In the DocketMath interface, parenting-time inputs may appear as:

• overnights / time share
• time-share assumptions tied to custody schedule selection

Operationally, the logic is:

• Start with the table-based base obligation
• Then apply a directional adjustment based on the parenting-time inputs you select

Step 3: Model the alimony component under Utah Code § 30-3-5(8)

Utah handles alimony separately from child support. The governing statute referenced here is:

• Utah Code § 30-3-5(8)

DocketMath’s combined tool is useful because it lets you:

• Estimate alimony for a set of assumptions
• Compare scenarios to see how changes in alimony assumptions affect the overall monthly support picture

Step 4: Use the general/default period workflow (no claim-type-specific variation identified)

A key point for how this guide frames the workflow:

• No claim-type-specific sub-rule was found in the provided materials.

• Therefore, this guide describes the general/default approach:

  • Base child support table first under § 78B-12-301 using combined AGI
  • Then incorporate calculator-supported adjustments based on your inputs

If your case involves unusual circumstances or a specialized worksheet path not represented in the tool, DocketMath can still be helpful for baseline numbers—but you should align the tool’s assumptions with your facts.

Step 5: Interpret outputs as estimates, not guaranteed court outcomes

DocketMath output is best treated as a calculation snapshot for comparison and planning:

• Change combined AGI → base table lookup changes → child support output changes.
• Change parenting-time assumptions → post-table adjustment changes → child support output changes.
• Change alimony assumptions/inputs → alimony output changes → combined monthly picture changes.

A simple “what moves what” map:

Common pitfalls

These issues commonly lead to confusion when people compare calculator results to expectations.

• Mixing definitions of income

  • Enter AGI consistently for both parents, because the combined AGI is what drives the base table under § 78B-12-301.
• Using parenting-time numbers that don’t match your facts

  • If your schedule fluctuates, choose a reasonable baseline and clearly understand what assumptions your run reflects.
• Treating alimony and child support as one blended number

  • Utah treats them separately:

    • Child support: built from § 78B-12-301 table mechanics
    • Alimony: governed under § 30-3-5(8)
• Forgetting the base table is the foundation

  • A table “band” shift from a small AGI change can cascade through the worksheet and create a large difference.
• Assuming a special claim-type variation automatically applies

  • Based on the materials provided here, no claim-type-specific sub-rule was identified—so this guide reflects the general/default period method.

Pitfall reminder: The base table is a lookup driven by combined AGI. If that number is off, the rest of the calculation will be off too.

Sources and references

• Utah Code Title 78B, Chapter 12 (Child Support), including § 78B-12-301 et seq.
  Source (statute): https://le.utah.gov/xcode/Title78B/Chapter12/78B-12-S301.html
  Provided statutory excerpt:
  “The base combined child support obligation table in Section 78B-12-301 shall be used to determine the base child support award based on the parents' combined adjusted gross income.”
• Utah Code § 30-3-5(8) (Alimony/Spousal support)

Next steps

1. Open DocketMath here: /tools/alimony-child-support
2. Enter both parents’ best-estimate AGI figures and compute a realistic combined AGI scenario.
3. Add your parenting-time inputs (or the closest approximation you can justify for the run).
4. Run an alimony scenario using the tool’s settings tied to Utah Code § 30-3-5(8).
5. Compare at least two scenarios:

   • Baseline (your best estimate of AGI + time share)
   • Sensitivity run (e.g., adjust AGI slightly or change time-share assumptions to see how outputs move)

Related reading

• How Alimony Child Support rules vary in New York — What varies by jurisdiction
• How to calculate Alimony Child Support in Philippines — Full how-to guide with jurisdiction-specific rules
• [Worked example: Alimony Child Support in Philippines](/blog/example-al