Check again with your employer.
If you have any type of Roth as a retirement account it will probably be a Roth 401(k) or 403(b) plan.
Look at your W-2 in box 12 is an amount listed with a code of AA? If so you are contributing to a Roth 401(k)
Or is the code a BB? If so you are contributing to a Roth 403(b)
The amounts shown in box 12 are not entered anywhere else on your tax return.
