I'm retired and receiving Social Security and Pension income as well as my IRA. I have a small business that has provided me with some writeoffs and negative profit. I have health insurance thru the ACA.

In 2016, I received an unexpected monetary settlement from a previous employer which effectively knocked me out of qualifying for premium subsidies on my ACA health insurance. Now that it's tax time, that extra income in 2016 has come back to bite me. IRS says I owe them the subsidies they gave me ($7K plus) which changes my $3200 refund to a $4400 tax debt. Is there anything I can do at this point to get around this? Any loopholes or deductions I can claim that I might have missed? Thanks.