My partner and I live together but are unmarried. Will our combined household income be used to determine our eligibility for and the amount of premium tax credits?

Assuming that neither of you is claiming any dependents on your tax returns, you will each be considered a household of one, and your own incomes will be used to determine eligibility for and the amount of premium tax credits and cost-sharing reductions. If you are eligible for premium tax credits, you will each receive a separate determination of the amount of your credit and whether you are eligible for a cost-sharing reduction. If you are considered separate tax households and one partner doesn’t claim the other as a dependent, you will likely have to buy separate plans to take advantage of Marketplace financial assistance. However, if you live in a state that runs its own Marketplace, you should check to see if this may be a possibility. Information about who is and is not included in a household for Marketplace coverage and premium tax credits is available here.