For the 4th scenario, if I had an excess contribution in 2019 through payroll deduction plan but cured it by withdrawing the excess in early 2020, how do I NOT report the "overfunding" on my 2020 return when it is already reported with code "W" in box 12 on the W-2? I've read elsewhere to get a corrected W-2 but payroll has told me a corrected W-2 is not necessary. Is there another way of telling IRS that I already withdrew the excess?
