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The IRS Information Returns Intake System (IRIS) is the agency’s electronic intake system for many information returns. It has two filing channels: a free Taxpayer Portal for direct entry or CSV upload, and Application to Application (A2A) for software-based transmissions. Businesses of any size can use IRIS when they have the required authorization and are filing a form supported for the applicable processing year.
For most filers, the practical requirements are an employer identification number (EIN), an IRIS Transmitter Control Code (TCC), and a return included on the IRS’s current IRIS form list. The portal does not require special software; A2A is intended for high-volume or software-integrated filing.
What the IRS IRIS system does
IRIS receives electronically filed information returns and routes them into the IRS processing system. The IRS describes it as a modernized system with two intake channels: the IRIS Taxpayer Portal and IRIS Application to Application (A2A).
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Information returns report payments, distributions, interest, dividends, securities transactions and other amounts to the IRS and to recipients. Common examples are Forms 1099, 1098, 5498, 1042-S, 3921, 3922 and W-2G, although the exact form inventory changes by processing year. IRIS is an intake system, not a replacement for every payroll or tax filing. For example, Forms W-2 are filed electronically with the Social Security Administration, even though the IRS includes W-2s when explaining the general information-return e-filing threshold.
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Who can use IRIS?
Businesses of any size
The IRS says the Taxpayer Portal is available to businesses of any size. A small landlord, nonprofit, partnership, corporation or accounting practice can use the same portal as a larger organization, provided the user is authorized and the intended return is supported. The portal is free and does not require specialized filing software.
Required identity and authorization
Ordinary portal access requires an EIN and an IRIS TCC. The TCC identifies the transmitter authorized to send information returns. It is separate from the EIN: the EIN identifies the business, while the TCC authorizes electronic transmission through IRIS.
TCC approval is not instantaneous. IRS e-file guidance says processing may take up to 45 days. That is an estimate, not a guarantee, so a first-time filer should apply well before a filing deadline. An organization that files for several legal entities should confirm which EINs and authorized users are covered by its access arrangement.
Foreign filers with unusual identification circumstances
Certain foreign filers whose authorized users do not have an SSN or ITIN may use the IRS Foreign Filer TCC Registration System. This is a special registration route for that situation; it is not a blanket substitute for ordinary IRIS access for every foreign business. A foreign organization should determine whether its authorized users meet the specific eligibility conditions before choosing that route.
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Who may file a particular return
Being eligible to access IRIS does not mean every form can be submitted at any time. The IRS publishes form availability by processing year. Before preparing a file, confirm the form number, tax year and processing year on the live IRIS listing. A return can be electronically filed only when the relevant form is listed for that processing year and the filer meets any form-specific rules.
Choose between the two IRIS filing channels
| Channel | Best suited for | Capacity and method | Additional setup |
|---|---|---|---|
| Taxpayer Portal | Businesses and professionals with modest or occasional volumes | Free web interface; enter records manually or upload a CSV; up to 100 returns at a time | EIN and IRIS TCC; no special software |
| A2A | Software developers, transmitters and high-volume filers | Software-to-IRS transmission; up to 100 MB per transmission and thousands of returns, depending on file design | A2A TCC, API Client ID, schema package and successful Assurance Testing System (ATS) transmissions before production |
Do not assume that paid software or A2A is required simply because a business has an e-filing obligation. The IRS identifies the Taxpayer Portal as a free route that needs no special software. A2A becomes useful when records are generated by an accounting or payroll system, when repeated manual entry would be impractical, or when file volumes exceed the portal’s per-upload workflow.
Which forms and years does IRIS support?
IRIS form coverage is organized by processing year rather than by a permanent list. The processing-year 2026 list covers tax year 2025 and includes many forms in these families:
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- Forms 1097
- Forms 1098
- Forms 1099
- Forms 3921 and 3922
- Forms 5498
- Form W-2G
This family-level summary is not a substitute for checking the current list. The IRS can add, remove or change forms and specifications between processing years. IRS TCC guidance says that beginning filing year 2027, IRIS will also accept Forms 8027 and 8955-SSA.
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Tax year and processing year are not interchangeable. A processing-year 2026 list covering tax year 2025 does not automatically establish eligibility for a 2026 tax-year return filed in a later season. Verify the exact combination shown in the IRS listing before creating a CSV or A2A file.
When electronic filing is mandatory
Beginning with tax year 2023, the general IRS rule requires electronic filing when a person must file 10 or more information returns during a calendar year. The count is aggregated across nearly all covered information-return types rather than calculated separately for each form. The IRS includes Forms W-2 in its explanation of the aggregate count, although W-2 transmissions go to the Social Security Administration.
For example, a filer with six Forms 1099-NEC, two Forms 1099-MISC and two Forms 1098 generally reaches the 10-return count. A filer below the threshold may still choose electronic filing through IRIS if the form is supported and the filer is authorized.
Exceptions, hardship waivers and other special rules can affect the mandate. Organizations with unusual filing populations, corrected returns or a need for a waiver should consult the current IRS instructions for the specific return instead of relying on the 10-return rule alone.
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How to get ready for IRIS access
- Identify every return type and tax year. Make a list of the forms, original or corrected status, recipient count and intended filing season. Compare that list with the IRS processing-year form availability.
- Confirm the filing entity’s EIN. The EIN must correspond to the organization that is responsible for the information returns. Keep legal-name and address details consistent with IRS records.
- Apply for the appropriate TCC. Allow up to 45 days for IRS processing. High-volume software transmitters should request the A2A authorization rather than assuming a portal-oriented setup will support API transmissions.
- Choose the channel based on workflow. Select the portal for direct entry or CSV uploads of up to 100 returns at a time. Select A2A when the records originate in software, the volume is large, or recurring automated transmission justifies the testing work.
- Prepare source data and recipient copies. Validate taxpayer identification numbers, names, addresses, amounts and account information before transmission. Decide how payee statements will be delivered and retained.
How to file through the Taxpayer Portal
Manual entry
Manual entry is appropriate when the number of records is small and the data is not already structured in an accounting system. Sign in with the authorized account, select the applicable form and processing year, enter each payer and recipient record, review the validation messages, and submit the return. The portal allows users to download payee copies and retain records of filed and distributed forms.
CSV upload
CSV upload is more efficient when records are maintained in a spreadsheet or exported from another system. Use the column layout and data conventions specified by the IRS for that form and processing year. Do not invent column names or rely on a CSV built for a different year; specifications can change. Resolve every validation error before submission, then save the accepted transmission confirmation and a copy of the source file.
After submission
Keep the portal’s confirmation, filing date, record count and any error report with the organization’s tax records. A successful upload is evidence of transmission, not permission to ignore later IRS notices. Monitor the account for rejected records or correction instructions and preserve the exact data used to create recipient copies.
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A2A connects a filer’s software or transmission service to IRIS. It is designed for thousands of returns and supports transmissions up to 100 MB. The technical route requires more preparation than the portal.
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- Obtain an A2A TCC. The transmitter must be authorized for the A2A channel, not merely registered as a portal user.
- Set up the API Client ID. The client identity allows the transmitting application to authenticate to the IRS interface.
- Install the applicable schema package. Build files to the IRS schema and business rules for the specific processing year and form.
- Complete ATS transmissions. The Assurance Testing System is used to demonstrate that the application creates valid files and handles IRS responses correctly. Successful testing is required before production filing.
- Transmit production files and monitor responses. Track message IDs, acknowledgments, rejected records and correction workflows in the transmitting system. Retain an auditable link between source records, the submitted file and recipient statements.
A2A reduces repetitive data entry, but it is not a shortcut around validation. Changes to schemas, authentication or form specifications can require software updates before the next filing season.
IRIS and the retirement of FIRE
The IRS says FIRE is scheduled for retirement in the transition from tax year 2026 to filing season 2027, with IRIS expected to become the only intake system for information returns starting in filing season 2027. This is a date-sensitive implementation schedule. Organizations that currently transmit through FIRE should review the latest IRS notices, apply for IRIS credentials early, select portal or A2A, and complete any required testing before the transition deadline.
Common problems and how to avoid them
Applying too late for a TCC
A 45-day processing estimate can consume much of a filing season. Submit the application before year-end data preparation and maintain a backup plan for correcting identity or authorization issues.
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IRIS support changes by processing year. Check the live form list instead of copying a prior-year assumption. If a form is not listed, do not force it into a CSV or A2A schema.
Confusing the portal with A2A
The portal is a browser workflow with manual and CSV options. A2A is an API-based software workflow with an A2A TCC, client ID, schemas and ATS testing. Choosing the wrong route can create avoidable setup delays.
Counting returns incorrectly
The 10-return rule aggregates nearly all covered information returns and includes W-2s in the IRS explanation, even though W-2s are filed with the SSA. Count across the organization’s covered forms and then check applicable exceptions or waivers.
Losing evidence of filing
Save confirmations, accepted and rejected-record reports, source files, recipient-copy records and correction history. These records help reconcile what was transmitted with what recipients received.
Quick Recap
Which route fits your organization?
- Use the Taxpayer Portal when you need a free, no-special-software method and your workload fits manual entry or CSV uploads of up to 100 returns at a time.
- Use A2A when your software generates the returns, your volume is large, or recurring automated submissions justify API setup and ATS testing.
- Before either route, confirm the EIN, TCC status, exact form, tax year and processing year.
- If you transmit through FIRE today, treat the expected filing-season-2027 transition as a migration project rather than waiting for the final deadline.
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