Register your Business with the Maine Revenue Service - This online service allows businesses to register with Maine Revenue Services for new Sales & Use Tax, Use Tax, Service Provider Tax, and/or Income Tax Withholding accounts.

Registering for a Tax ID Number - An Employer Identification Number (EIN) is also known as a Federal Tax Identification Number, and is used to identify a business entity.  This link will bring you directly to an on-line application.