I see some say to enter it under Misc Income and some say to enter it under Retirement Plans and Social Security. Is there a preferred way to do this in Turbo Tax 2018 ?
I got the excess amount back as a check in March 2019. I did not get an amended W2 or 1099R.
Also TT keeps running smart check complaining about the excess 401K contribution.
Either way is fine, as long as the excess 401(K) contribution is included as wages on your 2018 Tax Return. You do not need an amended W2 and you won't receive a 1099R until next January.
NOTE: There is currently an e-filing issue within TurboTax related to excess contributions. An update to fix the issue is expected to be released around 4/5/2019. You can check out this TurboTax FAQ for more information: Excess 401(k) Contribution Preventing E-filing. Be sure to sign up for updates to be alerted as soon as there is a solution.
I am including the instructions for my preferred method below:
If you overcontributed to your 401(k) in 2018 and the excess was distributed in 2019, you need to include the excess contribution to your 401(K) on line 1 of your 2018 Form 1040 by following these steps:
You will receive a Form 1099-R in 2019 with a code P in box 7 which you can ignore if the excess deferral is reported as suggested above. However, the earnings (if any) will be reported on a separate 2019 Form 1099-R with a Code "8" in Box 7 that should be reported on your 2019 tax return.