A Federal “TIN” or Tax Identification Number is an identification number used by the IRS in its administration of tax laws. If you are a sole proprietor, generally, your TIN is your Social Security Number (SSN). For other business types (e.g., corporations, partnerships, limited liability companies), your TIN is your Employer Identification Number (EIN). It is critical that the TIN Yapstone has on record matches what is on file with the IRS. If Yapstone is unable to validate the TIN you supply against IRS records, you may be subject to a 24% withholding on your gross payments received until Yapstone receives a TIN from you that can be validated against the IRS’s database