Solved
Where is the $300 coming from if not the Schedule 1 lines? Is this a bug?
the calculation could be correct. the wording hasn't been updated to reflect what the law says
line 6 as worded omits plus the amount on line 10b - the charitable contribution deduction for nonitemizers. if your return reflects $300 on line 10b the calculation for taxable social security is correct.
here's a link to a properly worded Soc Sec worksheet
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.