An Employer Identification Number (EIN) is used to identify a business for tax purposes with the Internal Revenue Service (IRS). An EIN is similar to a social security number for your business. Every business, except for certain sole proprietorships that do not have any employees, should have such EIN. Certain nonprofit organizations such as churches, clubs, trusts, and estates, and others, must also have an EIN. A business is required to obtain a Federal Employer ID Number if it hires employees or meets other IRS guidelines...

In the United States, an Individual Tax Identification Number (ITIN) is a crucial identification number primarily used for tax processing, assigned by the Internal Revenue Service (IRS). It's indispensable for those who are employed and earn income in the U.S., but do not qualify for a Social Security Number (SSN)...