ACA AIR Error Codes
& Corrections Guide
Receiving an AIR error code is the beginning of a process, not the end. This guide explains all three layers of AIR validation, gives you a Top 20 error matrix, and provides four step-by-step correction workflows.
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Use alongside the ACA Filing Transmission Audit Checklist for complete transmission coverage.
📋 Get the Audit Checklist →Full Table of Contents
- 1
The Three Layers of AIR Validation
Schema, business rules, and duplicate/history check — with outcome matrix for each.
- 2
Top 20 Error Code Matrix
Quick-reference for the 20 most common errors with cause, severity, and resolution path.
- 3
The TIN Mismatch Problem
AIRTN500 deep dive — four resolution scenarios including IRS Written Assurance.
- 4
Correction Workflow 1: Rejected Transmission
Diagnosing the rejection, repairing the error, resubmitting, confirming replacement.
- 5
Correction Workflow 2: Accepted with Errors
Identifying affected records, building corrected 1095-C batch, confirming resolution.
- 6
Correction Workflow 3: AIRTN500 Resolution
Triage between data error, name change, ITIN conversion, and true mismatch.
- 7
Correction Workflow 4: Post-Acceptance Corrections
CorrectedInd rules, replacement transmittal decision, furnishing update requirement.
- 8
Retention and Documentation Checklist
Acknowledgement documentation and correction filing record requirements.
Use alongside the ACA Filing Transmission Audit Checklist for complete pre-transmission coverage.
Built for Practitioners
ACA Reporting Vendors
Resolve AIR errors quickly and build a documented correction trail for every client.
ACA Compliance Leads
Understand what “Accepted with Errors” actually means and when to act.
Payroll and HRIS Teams
Understand how TIN mismatches occur and how to resolve them without an IRS inquiry.
HR and Benefits Directors
Know which AIR errors require immediate attention and which can be corrected in the next filing cycle.
Getting AIR Errors You Can’t Resolve?
Our team diagnoses and resolves AIR transmission errors, AIRTN500 TIN mismatches, and correction filing issues for employers and ACA vendors.
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