1099SmartFile vs IRS IRIS Taxpayer Portal

1099SmartFile has no write-up on Specifiction yet; its figures are above.

The IRS IRIS Taxpayer Portal is a free web service for filing information returns through the portal or Application to Application (A2A). Portal users can enter data manually or upload CSV files, manage issuer information, keep filing records, download payee copies, submit corrections, and request automatic extensions. Portal access requires an IRIS Transmitter Control Code, a five-digit code used only for IRIS. A2A is an option for filers using third-party or their own software; it can submit thousands of returns, with uploads up to 100 MB at a time. Setting it up requires an A2A TCC, API Client ID, schema package, and successful Assurance Testing System transmissions. CSV formatting guidance and templates are available in the portal. IRIS accepts information returns for tax year 2022 and later. Starting with tax year 2023, filers with 10 or more information returns must file electronically; Forms W-2 are filed with the Social Security Administration. PDF downloads may take up to 10 minutes to appear in portal notifications, and company firewalls may block external downloads.