Correct income definition
Prompts you to use W-2 Box 5 (Medicare wages), not Box 1. Catches the most common income input error in TN child support cases.
Rule .04(3)
Tenn. Comp. R. & Regs. 1240-02-04
Tennessee child support,
calculated right.
An open-source implementation of the Tennessee Income Shares Model — accurate to the rule, fast to change, and ready to output an official-style worksheet for negotiation or filing.
What you get
Official-format TN worksheet
- • Schedule + above-cap BCSO lookup
- • Standard, 50/50, and custom parenting bands
- • Health, childcare, private-school, and special-expense add-ons
- • Self-Support Reserve and PCSO statutory-cap checks
- • Imputed vs. actual income comparison
- • Shareable URL and printable PDF
Validated against the official TN DHS Excel worksheet.
What this calculator gets right that others get wrong
Full above-cap formula
Properly handles combined AGI above $28,250/mo with the verified percentages (incl. the 8.05% / 4-child correction).
Rule .09(2)(d)
50/50 cross-credit, done right
Implements the literal reading of the equal-parenting rule. No folk formulas that double the obligation.
Rule .04(7)(b)(2)(i)
Private school as a deviation
Treats private school as the discretionary deviation it is, allocated pro-rata if granted — never 75/25 or 80/20.
Rule .07(2)(d)
Special expenses 7% rule
Computes the 7% of BCSO threshold automatically so amounts above it are properly treated as deviation.
Rule .07(2)(d)
Statutory PCSO ceiling
Flags when the calculated PCSO exceeds the statutory threshold so the recipient knows they bear the burden.
T.C.A. § 36-5-101(e)(1)(B)
Built for negotiation and filing.
Change any input and the result updates instantly. Print an official-style worksheet to PDF with one click — formatted to match the TN DHS Income Shares Worksheet courts recognize.
Open the calculator →