But anyone have a solid resource for handling mid-year corrections when employees under-withhold because Step 2 on the 2024 W-4 was skipped, especially after a Q2 bonus run? In our Q2 review, ADP SmartCompliance flagged 12 employees under-withheld following an April state supplemental rate change, and I’m looking for checklists or guidance on communicating lock-in letters and adjusting future withholding. General information only — this isn’t legal advice; for specific cases, please consult a qualified attorney.