Thank you very much for your reply. On my 2019 W-2, Box 2 (Federal income tax withheld) has $30,534.72. This is what the IRS letter says as well. But on my actual 2019 1040 (prepared using TurboTax and W-2 uploaded using TurboTax), line 17 (and line 20) has $33,808. How this might have happened is one thing (?) but my main question is how I should resolve the issue. Is the 1040X process straight forward? Thank you. Dan
