How Mississippi Calculates Child Support
Mississippi uses the Percentage of Income model for child support. The governing law is Mississippi Code Section 43-19-101. This model is simpler than the Income Shares approach used by most states. Mississippi bases the obligation on a fixed percentage of the paying parent's adjusted gross income, determined by the number of children in the order.
The receiving parent's income is not part of the base calculation in Mississippi. The formula focuses entirely on what the paying parent earns. This makes Mississippi's calculation more straightforward to understand, but it also means the result does not automatically account for income differences between the two parents the way an Income Shares model does.
The Mississippi Child Support Formula
Mississippi's calculation follows three steps.
Step one is calculating the paying parent's adjusted gross income. Step two is identifying the applicable percentage based on the number of children. Step three is multiplying the adjusted gross income by that percentage to produce the monthly obligation.
Mississippi's percentages under Section 43-19-101 are fixed:
- 1 child: 14 percent
- 2 children: 20 percent
- 3 children: 22 percent
- 4 children: 24 percent
- 5 or more children: 26 percent
A practical example: the paying parent has an adjusted gross income of $4,500 per month. There are two children. The obligation is 20 percent of $4,500, which is $900 per month. The receiving parent's income plays no role in producing that number under the base formula.
Calculating Adjusted Gross Income in Mississippi
Mississippi's "adjusted gross income" is not the same as take-home pay, and it is not the same as raw gross income either. Mississippi defines it as gross income minus mandatory payroll deductions, specifically federal income taxes, Mississippi state income taxes, Social Security, and Medicare.
Start with gross monthly income from all sources. Subtract federal income tax based on your filing status and actual withholding. Subtract Mississippi state income tax (Mississippi applies rates of 0 percent on the first $10,000, 5 percent on income above that in 2026). Subtract Social Security at 6.2 percent of wages up to $176,100 annually. Subtract Medicare at 1.45 percent of all wages. The result is your Mississippi adjusted gross income for child support purposes.
Voluntary deductions, health insurance, retirement contributions, and similar, are not subtracted. Only the mandatory tax and FICA deductions come out before the percentage is applied.
For self-employed paying parents, Mississippi uses net business profit after legitimate business expenses as the starting gross income before the adjusted gross income calculation is applied.
What Counts as Income in Mississippi
Mississippi 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 paying parent who is voluntarily unemployed or working below their capacity. Mississippi courts evaluate work history, education, and local employment conditions when setting an imputed income figure.
Step-by-Step: How to Use This Calculator
Step 1. Calculate the paying parent's adjusted gross income. Start with gross monthly income. Subtract federal income tax, Mississippi state income tax, Social Security, and Medicare. Do not subtract health insurance, retirement contributions, or other voluntary deductions.
Step 2. Identify the number of children covered by this order. The applicable percentage is determined by that number alone.
Step 3. Multiply adjusted gross income by the applicable percentage. This produces the base monthly obligation.
Step 4. Add healthcare costs. Mississippi courts typically add the children's health insurance premium on top of the base percentage amount.
Step 5. Note the receiving parent's income if you are considering whether a deviation from the guideline might apply. Their income does not affect the base calculation but may be relevant to a deviation request.
Step 6. Review the result and confirm the adjusted gross income figure looks accurate before accepting the final number.
Parenting Time Adjustments in Mississippi
Mississippi's Percentage of Income model does not include an automatic parenting time credit built into the formula. The base obligation is calculated purely from the paying parent's adjusted gross income and the number of children.
Courts do have discretion to deviate from the guideline when the paying parent has significant parenting time, particularly arrangements approaching equal time. A deviation is not automatic and requires a specific court finding. If you have substantial custody time, present it as a ground for a downward deviation with supporting evidence of the direct costs you bear during that time.
Add-On Expenses in Mississippi
Mississippi courts typically add healthcare premiums for the children on top of the base percentage obligation. Work-related childcare costs may also be allocated between the parents. Courts address extraordinary medical expenses and other child-specific costs on a case-by-case basis.
Reading Your Results
The results show the paying parent's adjusted gross income, the applicable percentage, the base monthly obligation, healthcare and childcare add-ons, and the final monthly total. The receiving parent's income does not appear in the base calculation.
If both parents have similar incomes, the result may feel asymmetric compared to what an Income Shares state would produce. This is a known characteristic of the Percentage of Income model. It focuses on the paying parent's ability to contribute rather than both parents' proportional shares.
After You Get Your Estimate
Mississippi courts follow Section 43-19-101 in all standard cases. Deviation is allowed when the guideline amount is manifestly unjust or inappropriate. Courts can consider both parents' incomes, the children's needs, significant parenting time, and extraordinary circumstances when evaluating a deviation.
Modification requires a material change in circumstances. A 15 percent or more change in the calculated obligation is a commonly referenced threshold. Income changes for the paying parent, changes in the children's needs, and changes in custody arrangements are the most frequent grounds.
A licensed Mississippi family law attorney can help you understand the deviation process and advise on modification options. Many offer a free initial consultation.