Split a large CSV into 250-record IRIS files.
IRS Publication 5717 (Rev. 2-2026) states that a CSV file can contain up to 250 forms. This tool keeps your header row and creates smaller CSV files entirely in your browser.
✓ No CSV is uploaded to this websiteWhat the splitter changes — and what it does not.
The first row is treated as the CSV header and is copied into every output file. Data rows are divided into groups of the size you choose, up to 250. The tool does not change tax values, names, TINs, dates, or any other cell content.
Because the work happens in JavaScript in your browser, your source file is not transmitted to 1099ERICH.com.
Publication 5717 (Rev. 2-2026) states that an IRIS CSV file can contain up to 250 forms. Verify the current CSV template and IRS Publication 5717 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.