What changed in the Premium Tax Credit for 2020 due to the American Rescue Plan Act is that if you received excess advanced payments (the subsidy to reduce your premium) you will not be required to repay the excess.
So you won't get all of your premiums back but you will not be required to pay anything back. If your income was reduced in 2020 vs what you reported when you signed up for the income it is still possible that you paid too much and will get a credit on your return.
I hope this helps.
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