Montana Child Support Calculator

Based on Montana Child Support Guidelines (ARM 37.62.101-148), effective February 1, 2026. Uses the Modified Melson Formula with personal allowance, PCSA, and SOLA stages.

Children & Custody

Paying Parent

Receiving Parent

Add-ons

Children and custody

The Montana formula uses annual overnight visits to determine any parenting time adjustment. The adjustment applies when the paying parent has more than 110 overnights per year.

Number of children

Paying parent annual overnight visits

Paying parent

0nights/yr

No overnights

Receiving parent

365nights/yr

100% of the year