Check an IRS IRIS CSV file before you upload it.
Select the information return and add your CSV. The tool compares the column structure with the bundled form template, checks row consistency and several common values, and warns when a CSV contains more than the current 250-record file limit stated in Publication 5717 (Rev. 2-2026).
✓ Your CSV stays on your computerValidate your CSV
Structural validation is not the same as IRS acceptance. Always use the current IRS formatting guidelines for your filing year. Publication 5717 (Rev. 2-2026) states that CSV files can contain up to 250 forms; confirm the current portal guidance before filing.
Open a validator for your exact form.
Current IRIS availability and CSV requirements can change. Verify the current IRS IRIS guidance before filing.
Move from a free check to the complete 1099ERICH workflow.
The free tools help diagnose individual filing problems. 1099ERICH is a Windows desktop workflow with plans starting at $149 for importing CSV or Excel data, validating records, printing recipient copies, and creating IRIS-ready CSV files.
Need more than the free check?
Use this tool to identify the issue, follow the detailed support guide for the filing decision, then return to your controlled source file before creating the final IRIS output.
Need to prepare a less-common information return?
These separate free tools provide form-specific calculations, templates, and structural checks. Their intake spreadsheets are not official IRS upload files.