Quick Read Selling Bitcoin held in a brokerage account can push provisional income past $44,000, making up to 85% of Social Security benefits taxable. The same Bitcoin sale in a Roth IRA produces zero impact on provisional income, Social Security taxation, or Medicare premiums. A single oversized brokerage sale can also trigger Medicare IRMAA surcharges, potentially raising Part B premiums to $689.90 per month per person for a full year. A recent study identified one single habit that doubled Amer ...