Which W-2 Box 12 code is used for a 403(b) plan?

The W-2 Box 12 code that corresponds to a 403(b) plan is indeed represented by the letter "E". This code is specifically designated for reporting contributions made to a 403(b) retirement plan, which is a tax-advantaged plan available primarily for employees of public schools and certain tax-exempt organizations. When an employer makes contributions to a 403(b) plan, these contributions are indicated in Box 12 using this code.

Understanding the specific codes used in Box 12 is crucial for accurately reporting compensation and benefits, as each code provides essential details regarding different types of retirement contributions and benefits received by the employee. The correct identification of Box 12 codes helps ensure compliance with IRS regulations and accurate tax reporting for employees.