About this calculator

Source of truth

The calculation engine implements Tenn. Comp. R. & Regs. Chapter 1240-02-04 (the Tennessee Child Support Guidelines). The BCSO Schedule, above-cap rates, statutory PCSO maximums, SSR amount, and imputation defaults are loaded from the official 2022 TN DHS Income Shares Worksheet.

Schedule effective date: 2021-10-01
BCSO rows: 2,815 (563 AGI levels × 5 child counts)
Above-cap formula verified row-by-row against the official .xlsm
Verification benchmarks pass within $1 of the official worksheet

Updatable

When TN DHS publishes a new schedule, replace src/lib/calc/data/schedule-2022.ts with the new version and update the constants in src/lib/calc/data/constants.ts. Old schedules can be preserved alongside for case reproducibility.

What this does NOT do

Split parenting (different children with different primary parents)
Non-parent caretaker situations
Federal benefit offsets (SSA dependent benefits) — Rule .04(3)(a)(5)
Alimony (separate analysis under T.C.A. § 36-5-121)
Retroactive support at prior-period schedules
Significant variance for modification (calculate both and compare manually)
Credit Worksheet for in-home and not-in-home children (accept user-provided credit)

Disclaimer

This tool produces an estimate based on the inputs you provide. It is not legal advice and does not create an attorney-client relationship. Outcomes in any specific case depend on facts, evidence, judicial discretion, and deviation analysis that this tool does not perform. Consult a licensed Tennessee attorney before relying on any number produced by this calculator.

Maintained by

TCB Law, PLLC.