MT Family LawUpdated for 2026 Guidelines

Montana Parenting Time & Custody Overnight Calculator

Calculate custody overnights, determine annual percentage split, and verify statutory qualification for child support reductions under Mont. Admin. R. 37.62.138.

Direct Answer · Custody Statutory Rule (2026)

In Montana: Parenting time directly reduces child support obligations when a non-custodial parent reaches 110 overnights per year (30% timeshare) under Mont. Admin. R. 37.62.138. The court calculates relief using the parenting time credit table (rule 37.62.138). Standard rotational schedules such as 2-2-3 (182 nights) qualify for full shared-custody adjustments.

Statutory Citation: Mont. Admin. R. 37.62.138Judicial Authority: Montana Family Court GuidelinesLast Verified: October 2026

Parenting Time & Custody Overnight Calculator

Calculate annual overnights, time-sharing percentage, and state child support adjustment qualification.

Jurisdiction / State:

1. Select Parenting Schedule Pattern:

2 nights every other weekend across 26 fortnights = 52 overnights/yr (14.2%).

Summer Extra Nights:Additional summer block

Holiday Extra Nights:Thanksgiving / Winter break

Annual Time-Sharing Breakdown

Parent A (Non-Custodial)

52 nights

14.2%

Parent B (Primary)

313 nights

85.8%

Parent A: 14.2%Parent B: 85.8%

⚠️Montana Statutory Threshold: 110 Nights (30%)

Below Threshold. Current schedule provides 52 overnights, which is 58 nights short of the 110-night threshold for Montana. Standard sole custody support applies without automatic time-sharing discount.

Statutory Legal Reference: Mont. Admin. R. 37.62.138 — Parenting Time Credit Table (Rule 37.62.138). In Montana, overnights are counted under the following rule: Credit is based on the number of 24-hour days or overnights spent with the parent.

Need Full Monthly Dollar Figures for Montana?

Calculate net payments using Montana's official child support schedule, health insurance add-ons, and income deductions.

Open Montana Support Calculator →

Montana Legal Guidelines on Custody Overnights

Statutory Threshold

110 Overnights

Equal to 30% of annual parenting time

Legal Methodology

Parenting Time Credit Table (Rule 37.62.138)

Governed by Mont. Admin. R. 37.62.138

Official Overnight Counting Rule in Montana

Credit is based on the number of 24-hour days or overnights spent with the parent.

Standard Default Possession Schedule

Alternating weekends, alternating holidays, and summer vacation blocks (~85–95 overnights).

Court Evidence & Verification Checklist for Montana

If you are requesting or defending against a child support reduction in Montana family court based on shared physical care, prepare the following evidence:

Document long-distance driving logs across rural Montana counties.
Save school report card conference attendance records.
Keep co-parenting app check-ins.

Montana Custody Overnights FAQ

What is Montana's parenting time credit threshold?

Under Mont. Admin. R. 37.62.138, parenting time credits begin when the parent has at least 110 overnights (approx. 30% of the year).

How does equal time-sharing affect child support in Montana?

Equal parenting time (182.5 overnights) yields an extensive credit, reducing the transfer payment to balance household income.

Data sources & methodology

Montana Statutory AuthorityMont. Admin. R. 37.62.138 — Official state guideline schedule and parenting time rules.
NCSL Custody GuidelinesNational Conference of State Legislatures — Shared Physical Custody and Parenting Time Models.
Montana Family Court RulesLocal standard possession schedules, overnight definitions, and administrative calculation forms.

Methodology and citations are maintained by the ChildSupportFig editorial team. Where an official guideline schedule is not yet loaded, results are shown as model estimates and the source is stated as a reference schedule.

Not legal or financial advice. Child support is determined by a court based on your state’s official worksheet. Online estimators provide an informal planning figure only. Laws change — always confirm the current guideline with your state child support agency or a licensed family law attorney in your state before relying on any number.