Forms 1042 & 1042-S: Your Year-End Reporting and Reconciliation Guide

Tie every payment to a valid withholding certificate, the right rate and an on-time deposit, then file Forms 1042 and 1042-S for tax year 2026, including the move to IRIS e-filing. Part of the Mac Neal LLC Resource Series.

Inside this guide:

• What Forms 1042, 1042-S and 1042-T each do
• Deadlines, extensions and e-file rules for 2026 forms, including IRIS
• Deposit rules and the four-way reconciliation of withholding, deposits, Form 1042 and Forms 1042-S
• Income codes, exemption codes and chapter indicators, at a high level
• Corrections, a November-to-March close timeline and the penalties to avoid
• Printable worksheets: a payee reconciliation, a filing calendar, a corrections log and a document checklist

18-page PDF with checklists and printable worksheets. Updated October 2026.

General education, not tax or legal advice. Have a question about your own situation? Book a consultation at www.macnealllc.com.