The IRS Affordable Care Act Information Returns (AIR) system acts as a rigid digital barrier. Before any human review takes place, the system performs a binary schema validation. It doesn’t check for intent; it checks your syntax.
If your file fails this check, you receive an immediate rejection. This means the IRS hasn’t legally received your filing. If this occurs near the March 31, 2026 deadline, you could be left fixing thousands of rows of data while facing potential “Failure to File” penalties.
Here are three common syntax errors that trigger hard rejections and the standards you should implement now to prevent them.
1. Special Characters in Name Fields
Modern Human Capital Management (HCM) platforms are designed to support global workforces, accepting characters like accent marks, apostrophes, and hyphens. The IRS AIR system, however, relies on an older, strict XML schema that does not support these modern formats.
The most common triggers for AIR rejection include:
- Apostrophes: Names containing apostrophes (common in Irish, Arabic, and Polynesian names) are often incompatible with the AIR schema
- Accents: Diacritical marks (e.g., in French or Latino names) will cause file rejections
- Punctuation: Periods used in suffixes like “Jr.” or “St.” are prohibited
Solution: Data transmitted to the AIR system must be sanitized to basic letters. Apostrophes should be removed entirely, and all accents and punctuation must be stripped during the export process.
2. The 35-Character Limit for Addresses
The AIR system enforces a hard 35-character limit for address lines. While modern systems can recognize longer addresses, the IRS will reject any file containing a line that exceeds this count.
Simply cutting an address at 35 characters is not a solution, as it often eliminates critical unit numbers or directional information. Manual auditing is inefficient and increases the risk of mismatch errors.
Solution: Implement a standard abbreviation protocol for all address fields.
Secondary Unit
- Apartment → APT
- Basement → BSMT
- Building → BLDG
- Department → DEPT
- Floor → FL
- Penthouse → PH
- Room → RM
- Suite → STE
Street Suffixes
- Avenue → AVE
- Boulevard → BLVD
- Circle → CIR
- Court → CT
- Drive → DR
- Parkway → PKWY
- Place → PL
- Road → RD
- Square → SQ
- Street → ST
- Terrace → TER
- Way → WAY
Directionals
- North → N
- South → S
- East → E
- West → W
- Northeast → NE
- Northwest → NW
- Southeast → SE
- Southwest → SW
3. Zip Codes Leading with Zero
The IRS requires zip codes to follow a 5-digit or 9-digit format. A common failure point occurs when exporting data to CSV formats (like Microsoft Excel), which often auto-formats zip codes as “Numbers.” This strips the leading zero from states like New Jersey or Massachusetts.
- Example: Trenton, NJ (08601) becomes 8601. To the AIR system, a 4-digit zip code is an invalid entry.
Solution: Zip code columns must be force-formatted as “Text” to preserve the leading zero. Alternatively, use a filing platform that hardcodes zip code logic to ensure the correct 5-digit string is always maintained.
An Extra Check: TIN/SSN Matching
Beyond syntax, employers must validate functional data. A frequent error involves mismatches between employee names and Taxpayer Identification Numbers (TIN/SSN).
This commonly occurs after life events, like marriage, where a name change is updated in the HRIS but not with the Social Security Administration (SSA) yet. The IRS validates the name and SSN against SSA records; if they don’t match, employers will get a list of errors after filing.
How Trusaic Helps You Clean Up Your Data Before Filing
The IRS AIR system lacks nuance; it only reads for acceptance or rejection. Waiting until March to audit your data virtually guarantees errors and unnecessary stress.
Manual data cleaning is time-consuming and high-risk. Trusaic’s ACA Complete® solution automates this entire hygiene process:
- Ingestion Filters: Automatically validates text fields against the IRS AIR schema
- Automated Correction: Standardizes characters and abbreviates addresses to accepted formats
- Comprehensive Validation: Checks field lengths and logic to ensure first-time acceptance
- Penalty Risk Assessment: Assigns a risk score to your data quality via a mock audit
Don’t let a formatting mistake trigger a hard rejection. Schedule a demo to see how Trusaic can validate your data before you file.