Cheapest ACA plans in Montana for 2026

Cheapest plans by metal tier

Lowest 2026 monthly premium for a single 40-year-old non-tobacco user, on-exchange, before any subsidy. Per-age figures derived from the CMS QHP Landscape file using the HHS standardized age-rating curve (45 CFR 147.102).

The actual cheapest plan in major counties

Same data the search returns: carrier, plan name, monthly premium, individual deductible, individual MOOP. Computed for a single 40-year-old non-tobacco user, before any subsidy. Catastrophic plans excluded because adults 30+ typically need a hardship-exemption certificate to enroll.

The actual cheapest plan for a family of four

Two 40-year-old adults and two kids in the 0-14 age band, before any subsidy. Carrier, plan name, premium, deductible, and MOOP exactly as the search would return them.

Subsidies: federal APTC + §1332 reinsurance

Montana does not fund a direct state premium subsidy but operates a §1332 reinsurance waiver that lowers on-exchange premiums for all enrollees. Marketplace help is:

1. Federal Advance Premium Tax Credit (APTC). Households 100-400% FPL on the PY2026 standard ACA contribution curve. The ARPA / IRA enhanced subsidies expired 2025-12-31 and are not in effect for 2026.
2. Federal cost-sharing reductions (CSRs). Households 100-250% FPL enrolled in a Silver plan receive reduced deductibles, copays, and out-of-pocket maximums automatically.
3. Montana Reinsurance Association Program.Montana's §1332 waiver reinsures high-cost individual-market claims. Active since PY2020, the program lowers gross premiums on Healthcare.gov for all Montana enrollees, not only those who receive APTC.

Montana expanded Medicaid effective January 2016 through the HELP Act (Health and Economic Livelihood Partnership), a §1115 waiver program. Adults 19-64 up to 138% FPL qualify, so there is no coverage gap in Montana.

Catastrophic plans in Montana follow federal rules

Montana follows the federal ACA default: Catastrophic plans are available to enrollees under age 30, or at any age with a hardship / affordability exemption. The PY2026 federal auto-expansion applies: adults 30+ automatically qualify when the lowest-cost Bronze plan exceeds the affordability threshold. APTC does not apply to Catastrophic plans.

Tobacco surcharges follow the federal 1.5x default in Montana

Montana applies the federal ACA default (45 CFR 147.102): carriers may charge tobacco users up to 50% more than non-users (a 1.5-to-1 rate ratio). The Montana Commissioner of Securities and Insurance reviews rate filings under Mont. Code Title 33. No Montana-specific cap below the federal 1.5x ceiling has been identified. Federal APTC does not offset the tobacco portion of the premium.

Carriers selling 2026 plans in Montana

3 carriers, 2,117 plans across 56 counties. 1,857 sold on Healthcare.gov, 260 off-exchange-only direct from carriers. Three carriers serve most Montana counties: Blue Cross Blue Shield of Montana (HCSC), PacificSource Health Plans, and Mountain Health CO-OP (the last surviving ACA Consumer Operated and Oriented Plan, serving Montana and Idaho).

Enrollment

Open Enrollment for 2026 coverage runs November 1, 2025 through January 15, 2026. Enroll by December 15 for a January 1 effective date; December 16 through January 15 takes effect February 1. Special Enrollment is available year-round for qualifying life events.

Direct enrollment: healthcare.gov.

Frequently asked questions