Bronze plans generally have the lowest premiums, but cover only 60 percent of medical costs on average. Policyholders will pay the difference, up to the annual out of pocket cap. Platinum plans have the highest premiums, but cover 90 percent of costs. Young adults up to age 30 can pick a skinny "catastrophic" plan — but you can't use your tax credit on a catastrophic plan.
Tip — Make sure your doctors and hospitals are in the plan you pick. You may have to check the plan's own website, or call your doctor.
Tip — Your share of the premium could be lower — even zero — if you apply your tax credit to a bronze plan. It's because the credit is keyed to the cost of a silver plan, which is generally more expensive.
Tip — Check if you are eligible for "cost-sharing subsidies," in addition to your tax credit. Extra help with out-of-pocket costs is available to people with modest incomes. But only with a silver plan.
Richard Onizuka, director of the Washington state market, says picking a plan could be the most difficult step. Most of his customers were previously uninsured, so insurance jargon could seem like a foreign language.
"The biggest challenge for consumers will be understanding health insurance and how to purchase it," he said.
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