Lead quarter-end and year-end execution, including W-2s, T4s, and global equivalents, plus corrections and amended returns (W-2C, Form 941-X), and prepare for payroll tax audits with the IRS, CRA, HMRC, and state and local authorities. Run payroll tax processing and reporting across weekly, bi-weekly, and international payroll cycles, including multi-state and internationally mobile employees, and support payroll transitions from M&A activity.