State tax ID numbers and federal Employer Identification Numbers are assigned to businesses that employ workers, but EINs can also be assigned even if the company has no workers.
You can find more information on the differences between Tax ID # and EIN on the IRS website at the following link:
https://www.irs.gov/site-index-search?search=+tax+id&field_pup_historical_1=1&field_pup_historical=1
UBI refers to Unrelated Business Income. According to the IRS website:
Even though an organization is recognized as tax exempt, it still may be liable for tax on its unrelated business income. For most organizations, unrelated business income is income from a trade or business, regularly carried on, that is not substantially related to the charitable, educational, or other purpose that is the basis of the organization's exemption. An exempt organization that has $1,000 or more of gross income from an unrelated business must file Form 990-T. An organization must pay estimated tax if it expects its tax for the year to be $500 or more.
More info on UBI can be found here: https://www.irs.gov/charities-non-profits/unrelated-business-income-tax.
Hope this helps!
