Solved
Turbo Tax is telling me I have over-contributed, and I will pay a penalty; however, I have not reached 18k. Why is that?
Do not enter your 401(k) contributions under Deductions & Credits. Your 401(k) is not an IRA. Any amounts shown in box 12 of your W-2 are to be entered only on TurboTax's W-2 form.
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