A tax identification number (TIN) is a unique nine-digit number issued by the Social Security Administration or the Internal Revenue Service to anyone who pays taxes (personal or business).

An EIN is a tax ID number for businesses, churches, and some other organizations. An EIN is a form of tax ID number, but not all tax ID numbers are EINs.

and "Do you operate your business as a corporation or a partnership?" the IRS says you need a Tax ID number. If you don't currently have a Tax ID Number and need to get one, follow these steps.

Crucially, the deadline for paying corporation tax is before the deadline for filing your company tax return – which is 12 ...