How Tennessee Calculates Child Support
Tennessee uses the Income Shares model for child support. The governing law is Tennessee Code Annotated Section 36-5-101, along with the Tennessee Child Support Guidelines. Tennessee adopted the Income Shares model in 2005 and uses gross income as the basis for its calculation. Both parents' gross monthly incomes are combined to determine the total obligation, and each parent contributes their proportional share.
One notable feature of Tennessee for income calculations: Tennessee has no general state income tax on wages or salaries. The Hall Income Tax on dividends and interest was fully eliminated in 2021. Tennessee workers pay only federal income tax and FICA on their wages, which means take-home pay in Tennessee is higher relative to gross income than in most states, though the child support formula uses gross income directly, so the no-tax status does not change the formula input.
The Tennessee Child Support Formula
Tennessee's calculation follows four steps.
Step one is determining each parent's monthly gross income. Step two is combining both gross incomes to produce the combined monthly gross income. Step three is finding the Basic Child Support Obligation in Tennessee's schedule using the combined income and number of children. Step four is calculating each parent's income share percentage and applying it to the obligation.
A practical example: Parent A earns $4,500 per month. Parent B earns $2,000 per month. Combined income is $6,500. Parent A's income share is 69.2 percent. If Tennessee's schedule sets the Basic Child Support Obligation at $1,100 for two children at $6,500 combined income, Parent A's base obligation is $761 per month before parenting time adjustments and add-ons.
Tennessee also has a self-support reserve. When a paying parent's income is low enough that the standard formula would leave them below a minimum self-support threshold, the court adjusts the obligation to prevent that outcome.
What Counts as Income in Tennessee
Tennessee uses a comprehensive income definition. Courts include wages, salaries, commissions, bonuses, overtime, self-employment income, rental income, pension and retirement distributions, Social Security benefits, SSDI payments, unemployment compensation, workers' compensation, and income from any other regular source.
Courts can impute income to a parent who is voluntarily unemployed or underemployed. Tennessee courts evaluate work history, education, skills, and the local job market when setting an imputed income level.
Tennessee allows deductions from gross income before combining incomes: court-ordered child support currently being paid for children from other relationships and court-ordered alimony from prior orders. These deductions reduce each parent's adjusted gross income before the proportional shares are calculated.
Step-by-Step: How to Use This Calculator
Step 1. Get your gross monthly income. Include wages, self-employment income, rental income, and any other regular source. Gross means before federal taxes and FICA. No Tennessee state income tax applies to wages.
Step 2. Subtract existing court-ordered obligations (child support or alimony from prior orders) from your gross income.
Step 3. Estimate the other parent's adjusted gross monthly income using the same method.
Step 4. Enter the number of children covered by this order.
Step 5. Enter your parenting time percentage. Tennessee measures parenting time in days per year rather than just overnights in some contexts. Count your actual days of physical custody, including overnights, per year. Divide by 365 to get your percentage. Tennessee applies a parenting time credit when the paying parent has 92 or more days per year of parenting time, approximately 25 percent of the year.
Step 6. Add healthcare costs. Enter the monthly premium for the children's health insurance.
Step 7. Add childcare costs. Enter monthly work-related childcare expenses.
Step 8. Review the full breakdown before accepting the result.
Parenting Time Adjustments in Tennessee
Tennessee applies a parenting time credit when the paying parent has 92 or more days per year with the children. Below 92 days, the standard Income Shares formula applies with no reduction.
At 92 days and above, Tennessee reduces the paying parent's obligation to reflect the direct costs they bear during their parenting time. The credit scales as days increase toward 183 days, equal parenting time. At 183 or more days per year, Tennessee applies an equal parenting calculation where both parents' obligations are evaluated and the higher earner pays the net difference.
Tennessee's 92-day threshold is a firm line. Moving from 91 to 92 days triggers the credit. If your parenting time is close to that mark, an accurate count matters. Count each day of physical custody, days that include an overnight as well as any extended daytime periods that qualify under your court order.
Add-On Expenses in Tennessee
Tennessee adds healthcare premiums and work-related childcare costs to the base obligation, allocated proportionally by income share. Courts may also address extraordinary medical expenses and educational costs on a case-by-case basis.
Reading Your Results
The results display shows each parent's adjusted gross income, combined gross income, the Basic Child Support Obligation from Tennessee's schedule, income share percentages, the parenting time credit if applicable, add-on costs, and the final monthly obligation.
Confirm that the parenting time credit applied correctly based on your day count. If your result looks unexpectedly high, verify that your parenting time days are accurately entered and that prior support obligation deductions were applied.
After You Get Your Estimate
Tennessee courts follow the guidelines in all standard cases. Deviation is allowed when the guideline amount would be unjust or inappropriate based on written findings. Courts consider both parents' financial resources, the child's specific needs, and any special circumstances.
Modification in Tennessee requires a significant variance from the current order. Tennessee's threshold is a 15 percent or more change in the calculated obligation or a minimum dollar change set by the guidelines. Income changes, shifts in parenting time past the 92-day or 183-day thresholds, and changes in healthcare or childcare costs are the most common grounds.
A licensed Tennessee family law attorney can review your calculation and advise on parenting time credits or modifications. Many offer a free initial consultation.