First, mixing in the Medicare component of your FICA contributions just confuses the issue. Second, the calculation does not appear to account for the fact that there is a cap on income for SS contributions. Third, I think it is a mistake to include anything but wage income in the calculation. Fourth, and most importantly, the current exemption from taxation of at least 15% of your Social Security payment already accounts for the fact that you paid tax on your gross income, including the amount that was contributed to the SS system.
Gumby you are right about the Medicare, I didn't catch that. I should use 6.2%. I'll attempt to correct that.
Good point about some peoples income is more than just work income. I don't see where the fourth point is relevant, I'm just trying to get to how much of our SS is taxed when we pay SS into the system. Clearly I'm not there yet, I'll try to calculate how the change from 7.65% to 6.2% will affect the 11.84% I initially calculated for the top of the 12% tax bracket. I went to ChatGPT to do the other brackets, the more I chatted the worse it's answer got. And then there is the argument that the employers contribution is actually yours, but I'm not going there, others can if they want. Thanks for the critic. I'll try harder!
Oh, I started the correction and here's my initial explanation to ChatGPT, I did use 6.2%. I will concede this is only if
all your income is subject to SS tax and this is only for the top of the 12% tax bracket. So, we do have these constraints, otherwise there are just too many variables without a program to add all the variables. The point of all this is, we don't pay tax on 100% our SS contribution, it is between 11% and 30%.
This is me telling Chat GPT how to calculate this, (again right or wrong)
" Let me try one example. income $123,500 - $29,200 standard deduction is $94,300. If we calculate the SS tax on the gross at 6.2%, that is $7,657, The Federal tax after the standard deduction would be, first 10%, $2,320, and 12% $8,532 for a total of $10,850. Adding both together would total, $18,507. If we calculate the other way where we subtract SS and then calculate Federal tax. We take $123,500 and subtract $7,657 we have $115,843. Then subtract the standard deduction from that $115,843 and get $86,643. now if we apply the tax brackets we get $2330 + $7,613.04 = $9,943.04 then add in the SS tax of $7,657 for a total of $17,600.04. So we paid an additional $18,507 - $17,600.04 = $906.96. Thus $906.96 / $7657 = 11.84% of the SS tax."