Tax

    Tax ID

    A generic term for any government-issued number that identifies a taxpayer.

    Definition

    In the US: SSN for individuals, EIN for businesses, ITIN for non-resident individuals. Required on every invoice over a state threshold.

    Related terms

    EIN (Employer Identification Number)

    A federal tax ID issued to US businesses by the IRS.

    W-9 form

    A US tax form independent contractors complete so payers can issue them a 1099.