Social Security (SS Series)

Forms for Social Security and Medicare reporting, including employer identification (SS-4) and self-employment tax.

The SS series includes forms related to Social Security and Medicare tax reporting. Form SS-4 is used to apply for an Employer Identification Number (EIN), which is required for any business that hires employees, operates as a corporation or partnership, or has certain tax filing obligations. Form SS-8 is used to determine whether a worker is an employee or independent contractor for federal tax purposes. These determinations affect withholding, employment tax, and benefit obligations. Form SS-16 is used by employers to claim a credit for tips reported by employees. The EIN obtained through Form SS-4 is used throughout a business's lifetime for all IRS filings.