Which of the following tax forms is used by employees to report their income tax withheld?

The W-2 form is specifically designed for employees to report their income and the amount of federal, state, and other taxes that have been withheld from their pay throughout the year. Employers are required to provide this form to their employees by the end of January following the tax year, summarizing the total earnings and tax withheld. This document is crucial for employees when filing their income tax returns, as it provides the necessary information to accurately complete their tax forms and understand their tax obligations.

In contrast, the W-4 form is used by employees to inform their employer about how much federal income tax to withhold from their paycheck. The 1099-MISC form is typically used to report income from other sources, such as independent contracting or freelancing, but not for regular employee wages. The I-9 form is used to verify an employee's eligibility to work in the United States and does not pertain to income reporting or withholding. Thus, the W-2 stands out as the correct choice for income tax reporting by employees.