Yes, but less elective deferrals.
Box 1 on Form W-2 should include: "total taxable wages, tips, and other compensation that you
paid to your employee during the year. However, do not
include elective deferrals (such as employee contributions
to a section 401(k) or 403(b) plan) except section 501(c)
(18) contributions." (From Instructions for Form W-2).
For an exhaustive list of what should be included in Box 1, please see: https://www.irs.gov/pub/irs-pdf/iw2w3.pdf (located on pages 15-16).
