Why does my Roth 401K say i can contribute up to $23,000 but turbo tax says i can only contribute $8,000 and over that i have a penalty?

[dmertz · Accepted solution]

Your Roth 401(k) is not a Roth IRA.  Enter amounts shown in box 12 of your W-2 only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.  Remove the erroneous Roth IRA contribution entry that you made.