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 CSV files can contain up to 250 forms. The IRS IRIS overview page separately describes e-filing up to 100 returns at a time, so verify the current portal screen and IRS guidance before filing.
Move from a free check to the complete 1099ERICH workflow.
The free tools help diagnose individual filing problems. 1099ERICH is the $299 Windows desktop workflow for importing CSV or Excel data, validating records, printing recipient copies, and creating IRIS-ready CSV files.