You have taken the right steps to include the amount of t...

Why does Smart Check keep flagging 401k Excess contributions ?

Why does smart check keep flagging my excess 401k contribution ? I did enter the excess amount under Less Common Income with the description "2018 Excess 401K Deferrals" ( per tt website suggestion on how to enter excess 401k contributions )

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You have taken the right steps to include the amount of the excess deferral on your 2018 Tax Return.

At this point, you are running into an e-filing issue within TurboTax. 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. If you do not want to wait for an update, you have the option to paper file your tax returns as this is only an e-filing issue.