Final answer:
Employers must file copies of employees' W-2s with the Social Security Administration (SSA) by the end of February every year.
Step-by-step explanation:
Employers must file copies of employees' W-2s with the Social Security Administration (SSA) by the end of February every year. The SSA is responsible for administering the Social Security program, which includes the collection of payroll taxes and the distribution of retirement benefits to eligible individuals.