What are the ACA health insurance metal tiers (bronze, silver, gold, platinum)?

The ACA requires all marketplace health plans to be sorted into four metal tiers: bronze, silver, gold, and platinum. The tiers are defined by actuarial value — the percentage of average healthcare costs the plan is designed to cover for a typical enrollee. The remaining percentage is your expected out-of-pocket share through deductibles, copays, and coinsurance. HealthCare.gov's plan categories page explains the framework in detail.

The four tiers at a glance

• Bronze (60/40): Plan pays ~60% of average costs; you pay ~40%. Lowest monthly premiums, highest deductibles and out-of-pocket costs. Best if you are healthy and rarely use healthcare but want protection from catastrophic costs.
• Silver (70/30): Plan pays ~70% of average costs; you pay ~30%. Mid-range premiums. Silver is the only tier eligible for cost-sharing reductions (CSRs), which can dramatically lower deductibles, copays, and out-of-pocket maximums for enrollees with income between 100% and 250% of the federal poverty level.
• Gold (80/20): Plan pays ~80% of average costs; you pay ~20%. Higher premiums, lower out-of-pocket costs. Better if you use healthcare regularly — the math often favors gold over silver for frequent users.
• Platinum (90/10): Plan pays ~90% of average costs; you pay ~10%. Highest premiums, lowest out-of-pocket costs. Suitable for those with predictably high healthcare utilization.

Why silver is special — cost-sharing reductions

Cost-sharing reductions (CSRs) are available only on silver plans and only for marketplace enrollees whose income is between 100% and 250% of the federal poverty level (FPL) and who receive a Premium Tax Credit. CSRs effectively upgrade a silver plan to gold- or platinum-level cost sharing (lower deductibles, lower out-of-pocket maximums) without changing the label. If you qualify for CSRs, a silver plan may give you gold-level benefits at silver-level premiums. HealthCare.gov's CSR guide has the income thresholds.

How to choose a tier

The right tier depends on how much healthcare you expect to use and your budget for premiums vs. out-of-pocket costs. The fundamental trade-off: bronze = bet on staying healthy (low premium, high exposure); platinum = hedge against heavy use (high premium, low exposure). Run a total-cost comparison: monthly premium × 12, plus realistic out-of-pocket spending under each tier's deductible and cost-sharing structure.

Brian's take: don't pick a tier off the premium alone

Brian's take: the premium is the easy number to compare and the least useful one on its own. Run the actual total-cost math across at least 2 policies before defaulting to bronze because it's cheaper monthly: a bronze plan's 60% actuarial value means the plan is designed to leave you covering roughly 40% of your own healthcare costs, while gold's 80% actuarial value flips that to about 20%. If you expect even a couple of routine specialist visits or an ongoing prescription, the gap between those two cost-sharing splits usually erases the premium savings within a few months. This same 60/70/80/90 actuarial-value framework applies in all 50 states because it's set at the federal level, not by your state's exchange — so the math you run for one plan year carries over even if you move.