When it comes to W-2 forms, the IRS relies on employers to report wages and other compensation paid to their employees during the tax year. The question of whether the IRS will catch a missing W-2 is not straightforward, as it depends on several factors.

Employers are required to file W-2 forms with the Social Security Administration (SSA) and provide a copy to their employees by January 31st each year. The SSA then forwards the information to the IRS. So, if a W-2 is missing, the IRS may still receive the information from the SSA. However, the IRS does not typically match up W-2 information with tax returns until later in the year, so there may be a delay in catching a missing W-2.
If a taxpayer has filed a tax return without including a W-2, the IRS may detect the discrepancy through its automated systems. The IRS uses a computerized system called the Information Returns Processing (IRP) system, which matches up W-2 and other income information reported to the IRS with tax returns filed by taxpayers. If the IRP system detects a mismatch between the income reported on a tax return and the income reported on a W-2, it may flag the return for further review.
If the taxpayer has not yet filed a tax return, the IRS will not have any information about a missing W-2 until the return is filed. However, if the taxpayer fails to include a W-2 when they file their return, the IRS may catch the error and take action.
When the IRS detects a missing W-2 or other discrepancies, it may send a notice to the taxpayer, requesting additional information or documentation. The notice may also indicate that the taxpayer owes additional taxes, penalties, or interest.
The consequences of a missing W-2 can vary depending on the circumstances. If the missing W-2 only affects a small amount of income, the consequences may be minor. However, if the missing W-2 involves a significant amount of income or is part of a pattern of noncompliance, the consequences can be more severe.
If the IRS determines that a taxpayer intentionally failed to report income, it can impose significant penalties and interest charges, and in some cases, even pursue criminal charges. However, if the taxpayer can demonstrate that the missing W-2 was due to an error or oversight, they may be able to avoid or reduce penalties.
To avoid issues with missing W-2s, taxpayers should ensure that all income is properly reported on tax returns. Taxpayers should review all forms they receive from employers, including W-2s, 1099s, and other tax documents, to ensure that the information is accurate and complete. If a W-2 is missing, taxpayers should contact their employer and request a copy as soon as possible. If the employer is unresponsive or unwilling to provide a copy, the taxpayer can contact the IRS for assistance.
In conclusion, while the IRS may catch a missing W-2, it is not a guarantee. The likelihood of being caught depends on several factors, including whether the IRS has received the missing information from another source, whether the taxpayer has filed a tax return, and whether the taxpayer has made any errors or omissions on their tax return. Taxpayers should take steps to ensure that all income is properly reported on their tax returns to avoid potential issues with missing W-2s.