When you file jointly, the premium tax credit is based on your joint income and not your spouse's income only.
The premium tax credit is given to tax payers with incomes between 100 and 400 per cent of the federal poverty level (FPL) and is reduced to 0 for incomes over 400 per cent of the FPL.
The 2017 FPL for 2 people is $20,290. so if you have joint income over 4 times that level, you have no premium tax credit and would have to pay back all the advance tax credit that your spouse received.
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