Yagents and RayNY are correct. In tax terms "a refundable credit" means you can collect it even if you owe no taxes. It does not mean you are refunded the amount that is in excess of your premium. "Advanceable" means they will pay the insurance company month-by-month ahead of time rather than make you wait for your taxes to be filed. So, you can get it as an advance, or get it at tax time (even if you owe no taxes, you get it as a refund), you can use all of it ahead of time, part of it, or none of it as an advance. But you will not get more subsidy than the amount of the premium for your QHP.