Marketplace insurance plans are categorized by metal levels: bronze, silver, gold, and platinum. The metal level is based on how much the insurer pays for services covered under the plan.
A silver plan is a health insurance plan where the insurer pays on average 70% of the cost of covered services.
The premium tax credit is limited by comparing the cost of your coverage to that of the second lowest cost silver plan that covers you and your family.
If you are enrolled in more expensive coverage, you will pay the additional amount. However, if you are enrolled in coverage that costs less, your share of the premium will also be less.
For more information, go to healthcare.gov