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IRS IRIS Portal: CSV Upload Tutorial

Complete step-by-step guide for W2 Mate users to upload, validate, and submit 1099 forms via IRS IRIS Taxpayer Portal

🚀 Quick Start: Review your 1099 data in W2 Mate → Export IRIS-ready CSV(s) → Upload to IRIS Portal → Review & Submit. W2 Mate automatically handles IRS CSV format and splits large files. For a comprehensive tutorial on using the IRIS portal please refer to Information Returns Intake System (IRIS) Taxpayer Portal User Guide (Publication 5717) .
1

Access IRIS & Upload CSV

Log in to IRIS Taxpayer Portal. Click the "Upload CSV with Form Data" tile on the Dashboard.

IRIS CSV Upload Button

In W2 Mate, export your IRIS CSV file(s) named like IRIS-CSV-1099-NEC-SAMPLE-COMPANY.csv. Large files auto-split (100 rows max now, 250 max for 2025+).

Click "Browse" in IRIS and select your W2 Mate CSV (look for files starting with IRIS-CSV-).

IRIS CSV Browse & Upload
2

Validation & Common Pitfalls

IRIS validates your CSV. If rejected, check for format issues.

You generally don't need to edit W2 Mate CSVs. If you must use Excel.

⚠️ Excel Editing Risks:
  • ZIP codes lose leading zeros ("01234" → "1234")
  • Amounts gain $ signs/commas
  • Names get auto-corrected
  • Drag/drop moves data to wrong cells
Best practice: Fix in W2 Mate → re-export CSV.

Valid files show filename + active Start button. Click to continue.

3

Review & Stage Forms

Click Start → Review forms on staging page.

IRIS Review Form Information

Spot-check data vs W2 Mate.

Click Add All. Repeat for all W2 Mate CSV files. Add All will stage your forms. Staging means the forms are collected and prepared in the portal, but they are not yet filed with the IRS. To complete the process, you must click Submit.

IRIS Add All Button
4

Submit Unsubmitted Forms

Go to Unsubmitted Forms. Check status:

  • ✅ Ready Ready to file — data is complete
  • ⚠️ In Progress Needs fixes — edit in IRIS or fix in W2 Mate

Select Ready forms → Submit.

IRIS Unsubmitted Forms
5

Confirm & Monitor Status

Review Summary of Transmissions → Submit All. Save Receipt ID.

IRIS Summary & Receipt

Track at View Submitted Forms:

IRIS Submission Status
Status Guide:
  • ✅ Accepted: Download PDF recipient copies
  • ⚠️ Accepted w/ Errors:

    • If your file shows as "Accepted with Errors", the IRS has received your data but found issues such as name/TIN mismatches. This status means the forms were "submitted", but you must file corrections directly in the "IRIS portal". You do not need to re-upload the CSV file.

    Correction summary: Log in to IRIS, locate the submission marked “Accepted with Errors,” open the record flagged with an error, edit the fields (for example, update the TIN or name), save your changes, and then resubmit the corrected record through the portal.

6

Pro Tips for Success

  • For questions about the IRIS portal itself (not W2 Mate), call IRIS Support: 1-866-255-0654
  • Keep all edits in W2 Mate (minimal CSV changes)
  • Compare IRIS totals vs W2 Mate 1096 screen
  • Upload all W2 Mate CSV files (auto-split files)
  • Archive: W2 Mate files + CSVs + IRIS Receipt IDs
  • 1099 forms must be filed by January 31 each year. Late submissions may incur IRS penalties.
💡 Why use the W2 Mate IRIS CSV Export Feature?

Do not create your own CSV files in Excel! W2 Mate handles the complex requirements for you: