A 9-digit number obtained from the IRS by a business with paid employees. If you're a sole proprietorship, your taxpayer ID number is your social security number. One of the first steps you will ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Investopedia / Michela Buttignol The term employer identification number (EIN) refers to ...

A Tax Identification Number (TIN) is required for all entities to file tax returns. Individuals use their Social Security Number (SSN) as their TIN for personal taxes. Businesses need unique TINs ...

PeopleImages.com / Getty Images Form W-9, Request for Taxpayer Identification Number (TIN) and Certification, is an Internal Revenue Service (IRS) tax form that businesses use to collect ...

Your Tax ID Number - sometimes also referred to as a Federal Tax Identification Number, a 95 Number, or EIN Number - is a nine-digit number issued by the IRS to be used by self-employed ...