Here’s what HIVE AI had to say about “What common filing errors trigger an IRS notice in 2026?”:
Common filing errors that often trigger an IRS notice (seen in the 2026 filing season)
Identity/SSN and name mismatches
- Missing SSNs or SSNs that don’t match SSA records for you, spouse, or dependents. 3
- Names that don’t match the Social Security card (including dependents). 3
- For EITC/CTC-related claims, SSN/name issues can lead to a rejected e-file or a math error notice (and related credit adjustments). 4
Wrong filing status (especially head of household)
- Selecting an incorrect filing status is a common trigger for IRS correspondence and processing delays. 3
Credit/benefit eligibility issues tied to preparer-filed returns
- If a return appears to have incorrectly claimed certain benefits (EITC, Child Tax Credit/ACTC/COD, American Opportunity Tax Credit, head of household), the IRS may send a CP591 notice. 5
Missing or incomplete income documents (leading to mismatches later)
- Filing before you have all tax documents (for example, missing a W-2 or 1099) commonly causes follow-up issues that can result in IRS contact and/or the need to amend once the correct forms arrive. 6 7
Information-return (1099 series) errors that generate IRS notices to payers/filers
These are common triggers of IRS notices for businesses/agencies that file information returns:
- Missing/incorrect payee name and TIN combinations on Forms 1099 can generate IRS backup withholding mismatch notices (CP2100/CP2100A). 8
- Missing/incorrect payee name/TIN issues can also generate other information-return notices (for example CP972F for certain federal agency filers). 9
- Common paper-filing errors for information returns include duplicate filing, mismatched filer name/address/TIN across Form 1096 and attached forms, omitting the decimal point for dollars/cents, and combining multiple return types under one Form 1096. 1
Name/TIN mismatch penalties on information returns (penalty notice context)
- The IRS can propose penalties (for example via Notice 972CG) when a Form 1099 or W-2G is filed with a missing/incorrect name and TIN combination (often because it doesn’t match IRS files). 2
Sources
1 – IRS.gov – General Instructions for Certain Information Returns (2025)
2 – IRS – Publication 5343 Helpful Hints for Indian Tribes and Tribal Entities to Avoid Penalties on Federal Tax Deposits and Information Returns
3 – Errors taxpayers should watch out for when preparing a tax return | Internal Revenue Service
4 – Handling processing errors | Internal Revenue Service
5 – Understanding your CP591 notice | Internal Revenue Service
6 – Taxpayers should avoid these common mistakes when they file their tax return | Internal Revenue Service
7 – What to do when a W-2 or Form 1099 is missing or incorrect | Internal Revenue Service
8 – Backup withholding “B” program | Internal Revenue Service
9 – Understanding Your CP972F Notice | Internal Revenue Service
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