Issuing a compliant W-2
The IRS boxes reviewers actually check, deadlines, and how to correct a W-2 after issuance.
A W-2 must reach every employee by Jan 31 and match what you file with the SSA. Box 1 (wages) should tie back to gross pay minus pre-tax deductions; Boxes 3 and 5 (SS/Medicare wages) usually diverge from Box 1 by the amount of 401(k) contributions.