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Web product
Added November 8, 2026
About the product
Withfile by Atesen Software prepares supported Publication 1187 files or 1042-S spreadsheets for IRIS Taxpayer Portal CSV output. Its browser-based workflow checks chapter 3 and 4 codes, names, addresses, rates and control totals, highlights issues for review, and splits the output into CSV files by tax year. The on-screen file check is free; downloading CSVs and a review workbook built from your own data requires a paid license. Withfile prepares files for the user to review and submit separately. It is not a filing service or tax advice and does not guarantee IRS acceptance. It is independent software, not affiliated with or endorsed by the IRS.
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