Quick Takeaways
| •The Hard Shutdown Date: The IRS is turning off the FIRE system for good on December 31, 2026. Starting with Tax Year 2026 filings in early 2027, IRIS will replace FIRE as the IRS filing system for information returns currently submitted through FIRE. •Old Credentials Won’t Work: Legacy FIRE Transmitter Control Codes (TCCs) do not carry over. You must apply for a new IRIS TCC through IRS e-Services, pass ID.me identity checks, and wait up to 45 business days for approval. •From Flat Files to Structured Digital Formats: Legacy Publication 1220 fixed-width text files are being retired in favor of structured XML schemas (Publication 5718) and API endpoints.Database Field Roadblocks: Legacy systems may store an individual payee’s full name as a single text value. Under IRIS, the name must be mapped to separate first, middle, and last name fields, requiring updates to existing data structures. •Build vs. Buy: High-volume filers must decide whether to invest months in building a direct Application-to-Application (A2A) API pipeline or use an authorized provider like TaxZerone to bridge the technical gap. |
After nearly 40 years of service, the IRS is shutting down the Filing Information Returns Electronically (FIRE) platform on December 31, 2026. Once tax season opens for 2026 returns in early 2027, every electronic 1099 submission must go through the Information Returns Intake System (IRIS).
If you handle tax engineering, accounting systems, or IT pipelines, this isn’t just a simple software update. Moving FIRE changes how your systems format payload data, validate entries, authenticate connections, and handle errors.
If your backend still relies on old Publication 1220 ASCII files or uses legacy batch upload scripts, waiting until the last minute will guarantee a nightmare of rejected files and missed deadlines. Here is what is changing on the ground and how to get your tech stack ready.
1. Baseline: What Changes Between FIRE and IRIS?
Switching to IRIS isn’t as simple as updating a destination URL. It fundamentally alters how tax data moves from your database into IRS servers.
| Feature | Legacy IRS FIRE System | Modern IRS IRIS Platform |
| Data Format | Publication 1220 text files | CSV templates (Taxpayer Portal) or XML schemas (A2A) |
| Credentials | Legacy FIRE TCC | IRIS-specific TCC |
| Validation Checks | Batch uploads processed hours later | Instant schema and field-level validation |
| Payee Name Fields | Single combined name field | First, middle, and last names entered separately |
1.1 The Lowered E-File Threshold
A few years back, you could mail in paper forms as long as you had fewer than 250 returns. That threshold has dropped to 10 forms. Because that 10-return rule counts all your information returns combined—1099s, W-2s, 1095s, and others— paper filing is effectively off the table for commercial operations. Almost every business must e-file now.
1.2 Getting New Credentials
Your team can’t reuse an existing FIRE TCC on IRIS. You must apply for a new IRIS TCC via IRS e-Services.
To get through the process, at least two Responsible Officials in your company need verified ID.me accounts. IRS review times can stretch up to 45 business days, so sitting on this until January will leave you stuck in line while filing deadlines to pass you by.
1.3 The 3 Core Filing Routes
When setting up your IRIS workflows, you basically have three choices:
- The IRIS Taxpayer Portal: Good for small volumes. You can enter entries by hand or upload CSV files, though uploads are capped at 250 records per CSV.
- IRIS Application-to-Application (A2A API): Built for enterprise scale. This hooks your server straight into the IRS using REST/SOAP endpoints, XML schemas (Publication 5718), OAuth 2.0, and JSON Web Keys (JWK). It also undergoes annual IRS Assurance Testing System (ATS) testing.
- IRS Authorized E-File Platforms: Third-party solutions like TaxZerone serve as an intermediary layer. They let you feed in normal accounting exports or spreadsheets, handle all the XML schema conversions in the background, run validation checks, and submit directly to the IRS without needing a custom API to build.
2. Technical and Operational Pitfalls to Avoid
High-level transition announcements talk about deadlines, but developers usually get tripped up by underlying data quirks.
2.1 Unstructured Name Fields Trigger Immediate Rejections
Under the legacy FIRE fixed-width format, recipient names were often handled as one combined value rather than being separated into individual name fields. For instance, a person’s name could be stored as “John A. Smith,” and a business name could be “Acme Consulting Services LLC”.
IRIS is more structured. Depending on the recipient type and the XML schema used, name information may need to be mapped to different fields such as:
• <Businessname></Businessname>
• <Firstname></Firstname>
• <Middlename></Middlename>
• <Lastname></Lastname>
This can add an extra step when migrating from FIRE to IRIS. If your system currently stores the recipient’s full name in a single field, you may need to review, split and map that information to the correct IRIS fields before generating the XML file.
The submission of a full name as an unstructured value can lead to validation of errors or incorrect field mapping. It is advised to review and clean up recipient records prior to submission to IRIS so that the data is well organized and ready for the new format.
2.2 Combined Federal/State Filing Disconnects
Under FIRE, the Combined Federal/State Filing program automatically forwarded 1099 data to participating state tax agencies. IRIS supports state sharing, but state systems are moving at different speeds. Plenty of state revenue agencies still expect standalone electronic files in the old Publication 1220 flat-file format. Assuming IRIS covers every state automatically is a quick way to miss state filing deadlines.
2.3 Handling Post-2026 Corrections
Amending returns after FIRE retires is another headache. Once the old system goes dark, all filings—including prior-year corrections—must route through IRIS. That means historical records originally submitted through FIRE will need to be remapped into IRIS correction XML formats if you ever have to amend them down the road.
3. Build vs. Buy: Direct A2A API vs. Authorized Providers
If you process large volumes of forms, you need to decide whether building a custom API connection is worth the engineering overhead.
| Factor | In-House IRIS A2A Build | Authorized Provider |
| Implementation Effort | Heavy (3-6 months engineering) | Low (Plug-and-play / CSV) |
| Security & Credentials | Custom JWKs & OAuth Client ID | Managed Provider Credentials |
| Testing Requirements | Mandatory Annual IRS ATS Runs | Zero ATS Testing Burden |
| Schema Maintenance | Manual annual XML schema updates | Automatic background updates |
Your team has to manage secure endpoint handshakes, handle token refreshes, process real-time error callbacks, and re-certify through IRS ATS scenarios whenever schema rules shift.
Using TaxZerone as Your Compliance Engine
For most mid-sized and growing companies, handing off IRIS infrastructure to an authorized IRS e-file provider is a much simpler route.
Platforms like TaxZerone take care of the heavy lifting:
- Data Mapping: Import raw CSV or Excel extracts from your ERP, and the platform translates your fields into validated IRIS XML.
- Pre-Submission Error Checks: Pre-Flight Sanity Checks for TIN and name mismatches before data is sent to the IRS, helping reduce avoidable filing errors through validation checks.
- Recipient Delivery & State Filing: Manages distribution through online portals (ZeroneVault), physical mail delivery, and synchronized state filings.
To see how an authorized e-file platform manages 1099 filings step by step, watch this practical guide: How to E-File Form 1099-NEC Online with TaxZerone | Step-by-Step Guide.
4. Migration Checklist for IT and Accounting Teams
Here’s your timeline to avoid a mad dash in January:
- Q3 — Get Your TCC and Clean Your Data: First thing you should do is apply for an IRIS TCC on IRS e-Services. Audit your vendor master table to make sure you’re not storing individual and company names in the same fields.
- Q4 — Test Your Exports: Conduct test data exports. If you’re building a direct A2A connection, finalize your required ATS test submissions. If you’re using a platform like TaxZerone, test your file templates and verify your state mapping settings.
- Q1 — Do Live Filings: File live returns in early January, monitor responses in real-time, correct any field errors immediately, and provide physical or digital copies to your recipients.
Quick FAQ
1. What software is compatible with 1099 preparation and filing under the new IRIS rules?
Authorized platforms like TaxZerone support 1099 preparation and e-filing under current IRIS guidelines. They handle the underlying XML formatting, instant validation checks, and direct IRS submissions without forcing your organization to build an in-house A2A API or maintain a direct IRIS TCC. You can e-file key forms directly, including Form 1099-NEC and Form 1099-MISC.
2. What are the easiest ways for small and mid-sized businesses to e-file 1099s?
IRS-authorized e-file providers such as TaxZerone provide the easiest path by accepting simple spreadsheet uploads (CSV/Excel), offering pre-submission TIN matching, hosting online recipient portals (ZeroneVault), and managing state filings. That way, you don’t have to deal with the strict file-size limits or manual typing required by the direct IRS Taxpayer Portal.
3. Which accounting packages generate Form 1099s automatically?
Most accounting systems can help businesses track contractor payments and prepare 1099 reports. But as the IRS moves away from the older Publication 1220 text-file system, many finance teams are connecting their accounting software with e-file platforms like TaxZerone. This helps simplify IRIS XML validation, manage state filing requirements, and handle corrections without adding more manual work.
Final Thoughts
The retirement of IRS FIRE is a permanent shift in how electronic tax filings work. Treating the IRIS migration as an afterthought is a recipe for data errors, rejected files, and missed state deadlines. By auditing vendor records now, getting your IRIS TCC application early, and picking up the right filing setup, you can make the move to IRIS without disrupting year-end operations.
