Convert your FIRE file to IRIS CSV

The IRS FIRE system accepts its last information returns on November 19, 2026 at 3 p.m. Eastern. After January 1, 2027, IRIS is the only electronic filing system for information returns^[1]. IRIS does not read the 750-character Publication 1220 file^[9]: the IRIS Taxpayer Portal takes the IRS's own CSV templates^[3].

The FIRE to IRIS Converter reads the Pub 1220 file your payroll, accounts-payable or core system already produces and writes IRIS Taxpayer Portal CSV files you upload under Upload CSV with Form Data.

Get the FIRE to IRIS Converter: $49, one-time
Single offline HTML file. Your file never leaves your computer.

What it does

• Forms: 1099-NEC, 1099-MISC, 1099-INT, 1099-DIV and 1099-R.
• No record limit. It splits output into CSV files of at most 250 returns, with one form type and one tax year per file, which is the IRIS upload rule^[3]. See how splitting works.
• Offline. It's one HTML file that runs in Chrome, Edge, Firefox or Safari. Nothing is uploaded, so recipient TINs stay on your computer.
• Control totals. It checks every End of Issuer "C" record count and amount total against the payee "B" records, then against what lands in the IRIS files.
• IRIS formatting rules. It applies the rules from the IRS CSV guidelines^[6]: TIN dashes, name and address character sets, the 35-character address limit, ZIP format, Y/N check boxes and plain decimal amounts. Every change is listed in a report.
• Names. Individual names are split into first, middle and last using the four-character FIRE name control.
• Tax year 2026. It flags NEC and MISC payments under the new $2,000 threshold^[11]. You can add the blank TY2026 templates from your IRIS portal, and values are placed by column name. That matters because the IRS added new 1099-NEC and 1099-MISC boxes for 2026^[10].
• Command-line version included (Node.js) for IT teams, plus a made-up 609-record sample file to try first.

What it does not do

• It doesn't file anything. You upload the CSV files to your own IRIS Taxpayer Portal account, which needs an IRIS Transmitter Control Code (TCC)^[4].
• Corrected returns are listed, not converted. In the IRIS portal you correct a filed return with the Correct/Replace button^[3].
• Other form types (1099-B, K, S, 1098, 5498, W-2G and so on) are listed as not converted.
• Foreign recipient addresses are flagged for you to finish by hand.

Read first

• FIRE shutdown dates
• 250-record limit
• How conversion works
• Form-by-form notes
• 1099-R in IRIS
• FAQ

Get the FIRE to IRIS Converter: $49, one-time
Single offline HTML file. Your file never leaves your computer.

Not affiliated with the IRS. Not tax advice. You remain responsible for your filing.

Sources

1. [1] IRS: Filing Information Returns Electronically (FIRE), FIRE system retirement
2. [3] IRS Publication 5717 (Rev. 9-2026), IRIS Taxpayer Portal User Guide, section 3.5
3. [4] IRS Topic no. 802, Applying to file information returns electronically
4. [6] IRS IRIS CSV Template Formatting Guidelines, tax year 2025 (ZIP of PDFs)
5. [9] IRS Publication 1220, Specifications for Electronic Filing of Forms 1097, 1098, 1099, 3921, 3922, 5498 and W-2G
6. [10] IRS Instructions for Forms 1099-MISC and 1099-NEC (Rev. December 2026)
7. [11] IRS Publication 1099 (2026), General Instructions for Certain Information Returns

IRS pages checked 2026-11-14. Not affiliated with the IRS. Not tax advice.