I correctly reported the W-2 income I received in 2024 to Covered CA. My SSDI was not approved until November after a hearing and two years. I subsequently received a lump sum payment for back pay and now it is causing me to owe $5081 to pay back the ACA premium tax credits. However, I had no idea my SSDI claim was ever going to get approved so I am wondering if there is any way to get an exemption from having to pay the premium tax credits back.
Unfortunately, there is no waiver currently. However, the repayment of ACA premiums is limited. For example, a single individual with income between $29,160 and $43,740 would have to repay no more than $950 if they received too much federal premium tax credit. This should be calculated for you on Form 8962.
There's a couple things you can do to reduce your MAGI for calculating your repayment amount. Here's a link showing the FPL Amounts.
There have been court cases with situations like yours, but Congress has not yet made lump sum SSDI payments an exception for repayment of the PTC. Here's more info.