Which financial document would likely provide details of withheld social security taxes?

The Form W-2 is the correct financial document that provides comprehensive details about an employee's earnings and the taxes that have been withheld from their paycheck, including Social Security taxes. Employers are required to fill out this form for each employee and submit it to the Social Security Administration, which helps in tracking earnings and determining future benefits.

The W-4 form is primarily used by employees to indicate their tax withholding preferences to their employers, while the Form 1040 or 1040A is a tax return where individuals report their income and calculate their tax obligations. Form 1099 is used to report various types of income other than wages, salaries, and tips, and is typically not associated with withheld taxes from employment. Thus, the W-2 is the specific document that summarizes all the tax information needed for employees, including details of Social Security tax withholdings.