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Invoice EIN Validator

Check US Employer Identification Numbers on invoices and W-9s, in bulk.

Invoice Tools Reviews Free · no sign-up

Quick Tool Overview

The Invoice EIN Validator checks US Employer Identification Numbers in bulk — nine digits, the 12-3456789 format and a prefix the IRS has actually issued — and flags numbers shaped like a Social Security number.

What it does
Validates EINs from invoices and W-9s
You give it
EINs, one per line
You get back
Format and prefix verdicts
Best for
Vendor onboarding and 1099 season
Invoice Tools Free, unlimited use No sign-up Runs in your browser

About the Invoice EIN Validator

An EIN is the number a US business gives you for tax reporting, and the one you will put on a 1099 at the end of the year. Unlike a VAT number it has no check digit, so there is less to verify — but there is more than nothing: it is nine digits, written 12-3456789, and the first two are a prefix the IRS has actually issued.

Paste one EIN or a column of them from your vendor list. Each is checked for length, for a prefix on the IRS list — which rules out numbers that were never valid — and formatted the way the IRS writes them. Numbers that look like Social Security numbers are flagged, because a sole proprietor often supplies one by mistake.

What no offline tool can do is confirm the EIN belongs to the name beside it. That needs the IRS TIN Matching service, and for contractors you should collect a signed W-9 regardless. Everything here runs in your browser.

Key features of the Invoice EIN Validator

Prefix list

Every prefix the IRS has issued.

Formatting

Written back as 12-3456789.

SSN warning

Flags numbers that look like an SSN.

Bulk with CSV

A vendor list in one pass.

Honest

An EIN has no check digit, and the tool says so.

How to use the Invoice EIN Validator

  1. 1

    Paste the EINs

    One per line, with or without the dash.

  2. 2

    Check the failures

    A bad length or an unissued prefix means it is wrong.

  3. 3

    Note the warnings

    Numbers shaped like an SSN are flagged.

  4. 4

    Match names at the IRS

    TIN Matching confirms the number belongs to the business.

Frequently asked questions

No. Only the length, the format and the prefix can be checked offline, which still catches most typos.

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