Yes, you will need to amend.
Box 13 Retirement plan is required to be marked correctly by the employer and the IRS uses this to determine if you are eligible for a deduction for a traditional IRA contribution if your modified AGI is above certain limits base on your filing status.
You may need to amend your return if you received a tax form
after you have already filed your taxes.
However, wait
until your tax return has been either accepted or rejected by the IRS
first. If rejected, then simply log back into your account and add the corrected W-2 information.
If it has
been accepted then:
and are due a
refund, it will be best if you first wait to receive your current refund before
you amend. Please note: A Form 1040X, Amended U.S. Individual Income Tax
Return can take up to 16 weeks to process once the IRS receives it.
After you
have received your refund (or are not expecting one), please read this
TurboTax FAQ about amending your 2018 tax return:
How to amend (change or correct) a return you already
filed.
