Lewis and Clark County, Montana Child
Support Estimator

Montana child support is calculated under statewide Melson Formula guidelines, but the filing, review, and enforcement process is local. Parents in Lewis and Clark County use the same statewide formula as the rest of Montana, then work through the county family court or child support agency process for orders, modifications, and enforcement.

Lewis and Clark County ranks 6th by population among 56 Montana counties. That matters for scheduling, clerk procedures, local forms, and how quickly a support order or modification moves through the court calendar.

Use this page to estimate the guideline amount first, then verify filing steps with the local court before submitting paperwork.

Lewis and Clark County's smaller local court system may have fewer family-law hearing days, so parents should confirm filing windows, remote appearance rules, and document requirements before relying on an estimate.

Lewis and Clark County District Court is located at 228 Broadway, Helena, MT 59601. The clerk can be reached at (406) 447-8216.

Check the court website for current child support forms, hearing procedures, and filing instructions.

The core inputs are each parent's income, the number of children, health insurance premiums, work-related child care, existing support obligations, and parenting time. Montana's calculator model is Melson Formula.

Governing authority: Mont. Code Ann. § 40-5-209; Montana Child Support Guidelines.

County location does not usually change the statewide formula, but it does determine where parents file, which clerk reviews paperwork, and which local judge or hearing officer applies the guidelines. Melson Formula under Mont.

Admin. R. 37.62.101 et seq.: Montana is one of only three states using this approach.

Step 1: each parent's primary support allowance (self-support reserve, approximately $1,000/month) is deducted from gross income. Step 2: remaining income funds the child's basic support needs per the Montana Child Support Guidelines table.

Step 3: if higher-income parents have remaining income, a Standard of Living Allowance (SOLA) adds a percentage of that remainder. Combined monthly income up to $10,000 is fully tabled; above that, the court exercises discretion.

Child care and extraordinary medical costs are added on top of the Melson base calculation. Administered by the Montana Child Support Enforcement Division (CSED) within DPHHS at dphhs.mt.gov/csed.

Statute: Mont. Code Ann. § 40-4-204; Mont.

Admin. R. 37.62.101.

Run the calculator with monthly or weekly income figures that match the official Montana worksheet. If a parent is self-employed, unemployed, or paid irregularly, gather tax returns, pay stubs, and proof of benefits before relying on the estimate.

Parenting time can affect child support because many states adjust the payment when the paying parent has substantial overnights. Enter the actual schedule, not the schedule you expect to negotiate later.

Parents in Lewis and Clark County should keep a written parenting-time calendar, school schedule, holiday rotation, and transportation plan. Those documents help the court compare the calculator estimate with the real custody arrangement.

If custody is still disputed, treat the estimate as a planning number. A final Montana child support order can change once the court sets income findings, parenting time, insurance credits, and child care allocations.

A child support estimate is not a court order. To change an existing order, a parent usually must file a modification request and show a qualifying change in income, custody, health insurance, child care costs, or another guideline factor.

For enforcement, Montana may use income withholding, payment records, tax refund interception, license actions, or contempt proceedings depending on the facts and the agency or court handling the case.

Before filing in Lewis and Clark County, compare your calculator result with the current order and collect proof for each input. Courts generally need documents, not estimates alone, before changing a support obligation.

Child support often intersects with custody, alimony, property division, and divorce costs. Use the Montana Custody Time Calculator to model overnights, then compare support with the Montana Alimony Calculator and Montana Divorce Cost Estimator.

For statewide guidance, start with the Montana Child Support Calculator. For local comparison, review nearby county pages so you understand how court process and filing logistics vary across Montana.

Compare Lewis and Clark County with other high-volume Montana jurisdictions: Yellowstone County, Missoula County, Gallatin County, Flathead County.

Each county page uses the same statewide guideline framework and adds local context for filing, court process, and related family-law planning.