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IRS

Taxpayer Identification Number (TIN)

Every taxpayer on the master file has a permanent number for identification of the tax account. The employer identification number (EIN) is used to identify a taxpayer's business account. The social security number (SSN) is used as the account number of an individual taxpayer.

Taxpayer Identification Number TIN EINSSNTIN

Taxpayer Identification Number (TIN)

Every taxpayer on the master file has a permanent number for identification of the tax account. The employer identification number (EIN) is used to identify a taxpayer’s business account. The social security number (SSN) is used as the account number of an individual taxpayer.