I had $15,000 in medical costs from last year, which included ~$300/month in ACA marketplace monthly premium payments that was offset by a "subsidy".
Now I'm finding, that because I underestimated my income on the ACA application, the IRS is taking back a lump sum from me for those subsidies, which is costing me about $9000 in my 1040 taxes due payment.
Question: because my monthly premium was actually $750 higher than I expressed in my itemized deductions ($9000/12), can I add that $9000 to my medical costs in 1040 Schedule A? If not, why not, since the monthly premiums were actually $1050/month, and not $300?
