TIN-US
US Taxpayer Identification Number. See official source.
Definition
TIN — Taxpayer Identification Number, US tax identifier issued by the IRS. Covers SSN, EIN, ITIN, ATIN and PTIN. Used in US invoicing and tax filings.
Origin
Managed by the Internal Revenue Service (IRS). The 9-digit SSN (XXX-XX-XXXX) dates from 1936; the 9-digit EIN (XX-XXXXXXX) identifies legal entities since 1954.
Use
In a US X12 810 Invoice, the seller's and buyer's TIN/EIN are carried by the N1*ST/N1*BY segments with the REF segment qualified EI (Employer's Identification Number).