Child Support Calculators / Montana
Montana Child Support
Calculator (2026)
Free guideline estimate under Montana's official child support guidelines — controlling authority: Mont. Admin. R. 37.62.101 et seq.. Built for family law attorneys and their staff. No account required, and nothing you enter is stored.
Overnights always total 365 — adjusting one side updates the other.
Get the court-ready worksheet — with the guideline edition and controlling statutory citation (Mont. Admin. R. 37.62.101 et seq.) — free for 14 days
- Printable court-ready worksheet with the full line-by-line calculation
- Guideline-edition badge and controlling-authority citation on the printout
- Adjustments detail: parenting-time credit, add-on allocation, deductions
- Save calculations to matters, plus spousal support and property division
14-day free trial · every feature included · see pricing
Informational estimate for licensed attorneys and their staff — not legal advice, not a guarantee of any court outcome. Verify against your jurisdiction’s official guidelines worksheet before relying on it.
How Montana calculates child support
Montana's child support guidelines are established by Mont. Admin. R. 37.62.101 et seq.. The state uses a Melson Formula model, which first reserves a self-support amount for each parent’s own basic needs, then allocates child support from the remaining income (a refined income-shares approach).
This calculator applies the current guideline edition: CSSD table CS-404.2 (Feb. 2025).
The result is the presumptive guideline amount — the starting point a Montana court uses before considering deviation factors. The court-ready worksheet with the full line-by-line calculation, guideline-edition badge, and statutory citation is available in Aequis with a free 14-day trial.
Montana child support FAQ
How is child support calculated in Montana?
Montana sets child support under its official guidelines (Mont. Admin. R. 37.62.101 et seq.), which use a melson formula approach. The guideline produces a presumptive monthly amount from the parents' incomes, the number of children, and inputs such as parenting time, childcare, and health insurance costs.
Is this the exact amount a Montana court will order?
No. This is an informational estimate of the presumptive guideline amount. Courts can deviate based on statutory factors, and official worksheets may require inputs this calculator does not collect. Always verify against the official guidelines worksheet before relying on any number.
What income counts for child support in Montana?
Guidelines generally start from each parent's gross income from most sources, with state-specific definitions, exclusions, and deductions. This calculator uses gross monthly income; consult Mont. Admin. R. 37.62.101 et seq. for what your state includes.
Do overnights affect child support in Montana?
Many states adjust the obligation for parenting time once overnights pass a threshold, and this calculator applies Montana's guideline treatment of overnights where the guideline provides one. The exact effect depends on the state's formula and the parents' incomes.
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