I married in 2016 used ACA before marriage, spouse much higher income, now IRS wants to charge me the full amount of ACA subsidy. MY income did not go up.

[MinhT · Accepted solution]

Unfortunately, this is how the tax law works. If you file jointly, the joint income is used to calculate the advance premium tax credit and if the joint income is much more than what you estimated when taking out the policy, you would be to repay all or part of the advance premium tax credit.