Free · Montana · Current law
Based on Montana's official Hybrid formula. Enter both parents' incomes and get an estimate in under a minute.
Before taxes — wages, self-employment, bonuses
A best estimate is fine for now
Taxes, mandatory retirement, union dues…
Work or school related
Estimated monthly support
The other parent pays you, the parent with primary timesharing.
Estimate only — based on a simplified reading of Montana child support guidelines. A judge can deviate. Not legal advice.
Get a plain-English copy of this estimate, the numbers used, and a short checklist for what to review before relying on it.
Montana's child support guidelines utilize a hybrid model, incorporating elements of both the Melson and Income Shares approaches. The calculation begins by reducing each parent's income by a self-support reserve after accounting for taxes and other mandatory deductions. Next, a primary support allowance is established for each child, representing their minimum subsistence needs. Finally, if any parental income remains after these deductions, a percentage of that income is added as a Standard of Living Adjustment (SOLA), allowing the child to share in the parents' standard of living.
A substantial change in either parent's income — voluntary or involuntary — can trigger a modification.
Changes in childcare costs or the children's health insurance premiums directly adjust the support amount.
If the custody schedule changes significantly, support can be recalculated under Montana guidelines.
Medical conditions, disabilities, or educational needs can justify a departure from the guideline amount.
Common questions
Montana has a mandatory 21-day waiting period after filing. Uncontested divorces typically finalize in 60–120 days for uncontested cases. Contested divorces involving custody disputes or complex assets can take 12–24 months or longer.
To file for divorce in Montana, there is no fixed residency waiting period, though you must be domiciled in Montana at the time of filing. Filing in the wrong jurisdiction can result in your case being dismissed, so confirm with your county clerk if you recently moved.
Montana is a no-fault divorce state. You can file citing 'irreconcilable differences' or 'irretrievable breakdown of the marriage' without proving the other spouse did anything wrong. Fault grounds (adultery, cruelty, abandonment) still exist but are rarely needed and don't typically affect property division.
Montana follows equitable distribution. Courts divide marital property fairly but not necessarily equally, considering factors like each spouse's income, contributions to the marriage, and economic circumstances. Separate property (owned before marriage or received as a gift or inheritance) is generally not divided.
Montana uses the Hybrid model to calculate child support. Both parents' incomes are considered along with the number of children, timesharing schedule, childcare costs, and health insurance. The resulting guideline amount is presumed correct but a judge can deviate based on special circumstances.
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