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All GuidesACA & Marketplace

ACA Marketplace 101: How Health Insurance Subsidies Work

An introduction to the Affordable Care Act Marketplace — who it's for, how subsidies are calculated, and how to estimate your real monthly cost.

8 min readReviewed for the 2026 plan year

Who the Marketplace Is For

The ACA Marketplace serves individuals and families under 65 who don't have access to affordable employer coverage, Medicare, or Medicaid.

How Subsidies Work

Premium tax credits reduce your monthly premium based on household income relative to the federal poverty level. Some Marketplace plans also offer cost-sharing reductions that lower deductibles and copays for qualifying incomes.

Metal Tiers

  • Bronze: Lowest premium, highest out-of-pocket costs when you need care
  • Silver: Moderate premium; required tier to access cost-sharing reductions
  • Gold: Higher premium, lower costs when you use care
  • Platinum: Highest premium, lowest costs when you use care

Key Takeaways

  • Marketplace subsidies are based on household income, not just whether you qualify at all.
  • Silver plans are the only tier eligible for additional cost-sharing reductions.
  • Your real monthly cost is premium minus any tax credit you qualify for.

Subsidy amounts and eligibility rules are set by federal and state law and change annually. This guide is educational, not a benefits determination.

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