Please explain more. Is your wife's Kaiser plan at her job? Doesn't sound like you can deduct that. How do you pay the Medicare? Is it deducted from your Social Security checks? You can deduct that as business.
Medicare plan B payments are qualified as Self-employed medical insurance premiums and should be entered under Business instead of in the Social Security Benefits entry area. So go back and take it off your SSA-1099 entry.
And why do you ask about entering one half of the amount? You can enter the full amount. And it has nothing to do with the SE tax.
Self-employed health insurance deduction goes on Form 1040 Schedule 1 line 17 then to 1040 line 10, as long as the expense is not greater than your net self-employment income. If it does exceed your net self-employment income it gets split automatically. An amount equal to your net self-employment income goes on Form 1040 Schedule 1 line 17 and the remainder gets added in to medical expenses on Schedule A.
