How to calculate Alimony Child Support in Tennessee

Quick takeaways

• In Tennessee, DocketMath’s alimony-child-support calculator is designed to compute child support under Tenn. Code § 36-5-101 and alimony under Tenn. Code § 36-5-121, using the Tennessee child support guidelines rules in Tenn. Comp. R. & Regs. 1240-02-04.
• You’ll start by entering net monthly incomes for each parent. DocketMath then uses combined monthly net income to locate the appropriate position in the Tennessee income-shares guideline schedule (as implemented in the rules set).
• Tennessee’s guidelines apply an income cap (presumptive) when combined monthly net reaches the schedule’s top threshold ($28,250).
• Tennessee also uses a minimum support order rule, which DocketMath enforces so modeled child support outputs don’t fall below $100.
• On the “alimony” side, DocketMath is structured to let you model alimony in a way that distinguishes timing/duration concepts (including short/mid/long marriage duration tiers used in the rules pack), rather than blending alimony and child support into one indistinct number.

Inputs you need

Before you use DocketMath, collect these items. Doing this up front prevents “garbage in, garbage out” results.

1) Children and what the order covers

• Child(ren) count covered by the order you’re calculating
• Whether your scenario includes alimony in addition to child support
• If you’re modeling alimony, the alimony “type” you want the calculator to apply (for example, the kinds of awards referenced in the statute)

2) Income inputs (net monthly income)

DocketMath’s Tennessee child support computation is schedule-driven, so use consistent definitions for each parent’s “net monthly income”:

• Parent A net monthly income
• Parent B net monthly income
• Make sure you’re applying the same net concept to both parents (so the combined number lands in the right schedule range)

3) Combined monthly net income (for schedule lookup)

The Tennessee guideline schedule is keyed by combined monthly net income:

• Combined monthly net = Parent A net + Parent B net
• DocketMath uses your combined number to determine the schedule position, including whether you’re within the table or at/above the $28,250 threshold.

4) Rule-aware thresholds and floors (what DocketMath will apply)

The Tennessee jurisdiction pack includes these key values:

• Income cap type: presumptive
• Income cap (max combined monthly net): $28,250
• Minimum support order: $100
• Marital duration tiers (used for alimony-related logic in the rules pack):

  • long tier: min 20 years
  • mid tier: 10 to 20 years (max 20, min 10)
  • short tier: max 10 years
• Modification model time period: 3 years

Quick checklist

• Child(ren) count entered
• Parent A net monthly income entered
• Parent B net monthly income entered
• Combined monthly net is within the guideline schedule range—or at/above $28,250
• If alimony is included, marriage duration supports the correct short/mid/long tier selection

How the calculation works

DocketMath’s alimony-child-support calculator for Tennessee (US-TN) uses a two-track structure: (1) child support computed from the Tennessee guidelines schedule rules, and (2) an alimony component computed from Tennessee alimony concepts and the jurisdiction rules pack.

Step 1: Compute combined monthly net

DocketMath starts by totaling the two parents’ net monthly incomes to get the figure used for the guideline schedule:

• Combined monthly net = Parent A net + Parent B net

Then it checks how that combined net compares to the guideline schedule breakpoints, including whether it reaches the top threshold.

Step 2: Look up child support guideline values in the Tennessee schedule

Once combined monthly net is determined, DocketMath maps the number to the appropriate position in the Tennessee child support guideline table implemented under Tenn. Comp. R. & Regs. 1240-02-04.

In practice, you may see schedule breakpoints such as:

• $1,000, $1,500
• $2,000, $2,500, $3,000
• Mid-to-high ranges such as $6,000 through $12,000, then continuing upward
• Higher breakpoints such as $15,000, $18,000, and so on
• Up to the schedule cap threshold at $28,250

From the matching schedule position, DocketMath calculates the guideline child support amount based on the number of children you entered.

Step 3: Apply the minimum support order rule

After computing the guideline child support figure, DocketMath enforces Tennessee’s guideline minimum:

• Minimum support order: $100

So even if the schedule math would suggest a lower output, the calculator ensures the modeled child support doesn’t go below $100 under the tool’s assumptions.

Step 4: Apply the presumptive income cap logic at $28,250

If your combined monthly net is at or above $28,250, DocketMath uses the income cap (presumptive) behavior from the rules pack:

• Income cap type: presumptive
• Income cap threshold: $28,250

This matters most in higher-income scenarios: the guideline amount won’t continue to increase beyond what the rules pack treats as the top threshold behavior.

Step 5: Compute the alimony component using Tennessee alimony framework logic

For the alimony side, DocketMath uses Tennessee alimony concepts under Tenn. Code § 36-5-121, combined with the calculator’s Tennessee-specific rules pack.

A key driver is marriage duration tiering, using the thresholds included in the rules pack:

• Short: max 10 years
• Mid: 10 to 20 years
• Long: min 20 years

If you enter a marriage duration that changes the tier selection, you should expect the alimony output to change accordingly.

Step 6: Keep child support and alimony separated in outputs

DocketMath is set up to help you keep the numbers distinct so you can draft more clearly:

• Child support guideline amount (schedule-based under the Tennessee guideline framework)
• Alimony amount (tier- and type-driven per the Tennessee alimony framework logic)

If the tool also provides a combined monthly total, it’s intended to help with cash flow planning without losing traceability between the two components.

Common pitfalls

These are the mistakes that most often skew Tennessee calculations in tools like DocketMath.

1. Using inconsistent “net income” definitions

• If one parent’s net includes deductions that aren’t applied to the other parent, the combined monthly net can land in the wrong schedule band.

1. Forgetting the $100 minimum support order

• A low-income scenario may look like it should produce a smaller number, but the calculator will enforce the minimum support order ($100).

1. Not noticing you hit the $28,250 presumptive income cap

• If combined monthly net reaches $28,250, the guideline behavior follows the presumptive income cap logic rather than continuing to scale upward.

1. Incorrect marriage duration tier selection

• Alimony tiering uses thresholds in the rules pack:

  • short = max 10
  • mid = 10 to 20
  • long = min 20
• If your input is near a boundary, small entry differences can move the tier and change the alimony output.

1. Trying to compare scenarios without controlling inputs

• When comparing outcomes (e.g., “increase income by $200”), make only one change at a time—otherwise it’s easy to misread whether the schedule position, the cap behavior, or the alimony tier drove the result.

Sources and references

• Tenn. Code § 36-5-101 (child support); Tenn. Code § 36-5-121 (alimony)
• Tenn. Comp. R. & Regs. 1240-02-04
• Tennessee child support guidelines page: https://www.tn.gov/humanservices/for-families/child-support-services/child-support-guidelines.html

Next steps

1. Open DocketMath and start with a baseline run using your best available net monthly incomes.

   • Primary CTA: /tools/alimony-child-support

2. Do a quick sensitivity check:

   • Adjust Parent A net monthly income slightly and confirm whether the combined monthly net crosses into a different schedule position.
   • Update marriage duration to see which short/mid/long tier the calculator uses for the alimony portion.

3. Sanity-check the rule-driven guardrails:

   • Confirm whether your combined monthly net is approaching or exceeding $28,250 (income cap behavior).
   • Confirm whether outputs are affected by the $100 minimum support order.

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 — Worked example with real statute citations