@ASmyth Turbo Tax does not have a problem calculating the taxable amount of SS or SSDI. If it did there would be lots and lots of posts.
Usually when the IRS increases the taxable amount of your social security it's because they increased some other income on your return. Or one of the entries showed up on the wrong line. Especially like any 1099R you got. If a 1099R got on the wrong line like1040 line 5 instead of line 4, the IRS might miss it and say you didn't report it.
Or there is a new question this year asking if you are a US citizen living abroad in one of these countries? People have been answering that wrong or skipping it which makes your ss not taxable.
This user figured out why they answered it wrong
https://ttlc.intuit.com/community/retirement/discussion/re-social-security-taxable-incom
