Frequently Asked Questions
How Is Filing with IRIS Different from Filing Through FIRE?
Acceptance is no longer based on file structure alone. Filing success depends on system identity, validation rigor, and transmitter approval.
Why Isn’t an IRIS-Formatted File Alone Enough for Filing?
IRIS introduces significantly stricter enforcement than FIRE. Files that appear structurally valid during development or testing may still fail in production due to business rules, sequencing requirements, identity mismatches, or security controls that only surface when submissions are made by an approved transmitter in the live IRS environment. For filers, this means that relying on upstream systems without proven production certification can shift filing risk directly onto the organization.
Why Does the Transition to IRIS Matter?
After December 2026, you will no longer be able to file your federal returns as you have done in the past. Processes that worked under FIRE do not translate in IRIS.
How can Sovos help my organization with the transition?
Sovos is a trusted, IRS-approved software provider that manages IRIS filing end-to-end. Our certified systems and proven processes help organizations file accurately, scale reliably, and transition to IRIS with confidence.
