I changed jobs in 2019 and in doing so over-contributed to my 401k, here is a summary of the situation:
You have until July 15 to remove your excess contribution.
Thanks! is there any IRS reference you can provide that can confirm this or is it just because the filing deadline has been extended therefore I will have more time to receive the 1099 and updated W-2?
Also do you know if I will be able to claim capital losses on the $2000?
See the IRS rules for withdrawal of excess contributions in the section of IRS Publication 590A at this link. The language in 590A is a generic "on or before the due date", so yes, because the due date has been extended to July 15th, that is the date for you to remove the excess contribution:
"Withdrawal of excess contributions.
For purposes of determining excess contributions, any contribution that is withdrawn on or before the due date (including extensions) for filing your tax return for the year is treated as an amount not contributed."
[Edited 04/03/2020|2:08pm PST]