Accounts payable reference, June 2026

Anthropic, PBC's tax ID is a US EIN, it is not public, and the W-9 is the only authoritative source.

People searching for the Anthropic, PBC tax ID usually want one number to drop into a vendor record. There is no public version of it. A private US company's EIN does not live in any free registry, and Anthropic's own help docs only cover how you set your tax ID, not theirs. The number moves through a signed IRS Form W-9 you request during onboarding.

Matthew Diakonov, Written with AI

Published June 20, 20267 min read

Extract vendor tax IDs on your Mac

Direct answer, verified 20 June 2026

Anthropic, PBC does not publish its federal EIN. The only authoritative source is the W-9 it provides on request.

Anthropic, PBC is a Delaware public benefit corporation at 548 Market St, PMB 90375, San Francisco, CA 94104. As a US entity its "tax ID" is an IRS Employer Identification Number (EIN). That EIN is not in any public database, because the IRS only exposes EINs for tax-exempt nonprofits and SEC registrants, and Anthropic is neither. To get it, you request a completed and signed IRS Form W-9 from Anthropic as part of vendor onboarding. The W-9 carries the legal name, entity type, address, and EIN, signed by the payee.

If you are a US business: ask Anthropic support or your account contact for a W-9 for Anthropic, PBC. Record the EIN from that form.
If you are outside the US: you almost certainly want the invoice tax number, not the EIN. That is a non-resident VAT/GST scheme registration on your Claude invoice. See the Anthropic VAT number guide.
If a third-party site shows an EIN: treat it as unverified. There is no canonical public list to cross-check it against.

Why there is no public Anthropic EIN to copy

An EIN is the US federal taxpayer identification number for a business, the rough equivalent of a person's Social Security Number. The IRS issues one to nearly every company, including Anthropic, PBC. But issuing a number and publishing it are not the same thing. The IRS runs exactly two public lookups that expose an EIN, and Anthropic falls outside both.

The first is the Tax Exempt Organization Search, which lists the EINs of registered 501(c) nonprofits. Anthropic, PBC is a for-profit public benefit corporation, not a tax-exempt nonprofit, so it does not appear there. The second is SEC EDGAR, where a public company's EIN shows up on its filings. Anthropic is a privately held company and does not file with the SEC, so there is nothing to read there either.

That leaves the W-9 as the genuine source of truth. It is the standard mechanism a US payer uses to collect a payee's taxpayer ID before reporting payments. When you onboard Anthropic as a vendor and ask for a W-9, you are using exactly the channel the tax system designed for this, instead of trusting a scraped value from a data broker.

EIN or VAT number? They are not the same lookup

Most of the confusion comes from one phrase, "tax ID," covering two completely different numbers. Pick the column that matches what you are actually trying to do, because the source, format, and where you record it are all different.

Feature	Invoice VAT/GST number	Anthropic EIN (US)
What it is	A non-resident VAT/GST scheme registration Stripe Tax applies per country.	US federal Employer Identification Number for the entity Anthropic, PBC.
When you need it	Reclaiming or recording VAT/GST on a Claude invoice outside the US.	US vendor onboarding, 1099 reporting, supplier master data.
Where to get it	Printed on your own Claude invoice PDF under the supplier tax ID line.	A signed W-9 requested from Anthropic. Not public.
Format	Country-prefixed string (GB, EU, CHE, T, etc.) that varies by jurisdiction.	Two digits, a hyphen, then seven digits (NN-NNNNNNN).
Public registry to verify	The relevant tax authority lookup for the printed prefix.	None for a private company; the W-9 is authoritative.

If you are not a US business, you almost always want the right column. The EIN is rarely the number that belongs in a non-US AP system.

What you actually receive: the fields on Anthropic's W-9

A W-9 is a one-page IRS form. When Anthropic returns a completed one, these are the fields your AP system cares about. The EIN sits in Part I as the Employer Identification Number. This is a representative layout; the values on your copy come from the signed form Anthropic sends you.

anthropic-w9-readout.txt

Anchor detail: the support article you may have found (support.claude.com article 9889408) does not contain any of this. It explains how a Claude customer enters their own Tax or VAT ID in Settings > Billing, the reverse of what you are looking for. There is no Anthropic-side EIN anywhere in Anthropic's self-serve documentation, which is exactly why the W-9 request is the step that matters.

Where people look versus where the number lives

Finding Anthropic, PBC's tax ID

Googling the EIN and pasting whatever a business-data site returns, or searching Anthropic's help center expecting their number.

Third-party data brokers show unverified or scraped EINs
Anthropic's support docs only cover your tax ID, not theirs
No public registry exists to confirm a private company's EIN
VAT and EIN get conflated into one wrong field

How to get Anthropic's tax ID and record it correctly

This is the practical path for a US business setting up Anthropic as a vendor. It assumes you need the EIN for a supplier record or a 1099, not the invoice VAT number.

1
Confirm the entity
For US counterparties the entity is Anthropic, PBC, a Delaware public benefit corporation in San Francisco. EEA, Swiss, and UK contracts are with Anthropic Ireland, Limited instead, which has its own Irish registration.
2
Request the W-9
Ask Anthropic support or your account contact for a completed, signed W-9 for vendor onboarding. Your finance or procurement team can make this request directly if you are paying Anthropic as a supplier.
3
Read the EIN from Part I
On the returned form, the Employer Identification Number sits in Part I, formatted as NN-NNNNNNN. Capture the legal name and address from lines 1 and 5 to 6 at the same time so your record matches the form.
4
Record it as a US supplier
Enter Anthropic, PBC with the San Francisco address and the EIN in your AP tool's US taxpayer ID field, not the VAT field. Keep the W-9 PDF on file for your 1099 and audit trail.

Related: if you contract through the EEA, Switzerland, or UK entity, see the Anthropic Ireland, Limited reference for that entity's registration details.

Where Fazm fits: reading the EIN off a W-9 as structured data

One W-9 is a ten-second read by eye. A finance team onboarding dozens of AI and SaaS vendors at quarter close is reading the same five fields off dozens of differently-formatted W-9 PDFs and typing them into a supplier master. That is the part worth automating, and it is exactly where screenshot-based agents break, because PDF viewers render differently at every zoom and vendor portals lazy-load their form rows.

Fazm reads the macOS accessibility tree directly through AXUIElement. In the app's source, that is AXUIElementCreateApplication and AXUIElementCopyAttributeValue pulling the focused window and its labelled elements (Desktop/Sources/AppState.swift, lines 488 to 521). A field labelled "Employer Identification Number" is a real element with a role, title, and value, no matter how Preview or Chrome paints it. So the same instruction works across the PDF viewer, the browser, and your accounting app together.

It works with any macOS app, not just the browser, and it is a finished consumer app, fully open source, that runs locally, so the W-9 and the EIN never leave your machine.

Automating vendor onboarding on a Mac?

See how Fazm reads tax IDs and vendor fields off W-9s and invoices through real accessibility APIs, not screenshots.

Frequently asked questions

What is Anthropic, PBC's tax ID?

For a US company, 'tax ID' means the federal Employer Identification Number (EIN) issued by the IRS. Anthropic, PBC is a Delaware public benefit corporation with its principal place of business at 548 Market St, PMB 90375, San Francisco, CA 94104, so it does have an EIN. But Anthropic does not publish that EIN anywhere public. The only authoritative way to obtain it is the signed IRS Form W-9 that Anthropic supplies when you onboard them as a vendor. Do not confuse this with a VAT number: VAT is the international equivalent and Anthropic handles that through separate non-resident schemes that print on Claude invoices, which is a different question.

Is Anthropic's EIN available in any public database?

No. The IRS does not run a public EIN lookup for private, for-profit companies. Public EINs are visible in only two situations: a tax-exempt nonprofit (searchable in the IRS Tax Exempt Organization Search) or a company that files with the SEC (its EIN appears on EDGAR filings). Anthropic, PBC is neither a tax-exempt nonprofit nor an SEC registrant as of June 2026, so its EIN is not in any free public registry. Third-party 'business data' sites that show an Anthropic EIN are guessing or scraping unverified data; treat them as unreliable for accounts payable.

How do I get Anthropic's W-9?

Request it through the channel you have a commercial relationship with. If you pay Anthropic for Claude, ask Anthropic support or your account contact for a completed W-9 for vendor onboarding. If your company is paying Anthropic as a supplier and you need to file a 1099 or set them up in your AP system, your procurement or finance team requests the W-9 directly. The W-9 is a standard IRS form (Request for Taxpayer Identification Number and Certification); the requester is you, and Anthropic is the payee who fills in its legal name, entity type, address, and EIN, then signs it.

Why does Anthropic's support article not list their tax ID?

Because that article is about the opposite direction. Anthropic's billing help article (support.claude.com article 9889408) explains how a Claude customer adds or updates their own Tax or VAT ID on a paid account so the right tax treatment applies to their invoices. It says nothing about Anthropic's own EIN, because a seller does not publish its taxpayer ID to buyers in self-serve docs; that information moves through a signed W-9 on request. So searching Anthropic's help center for 'Anthropic tax ID' returns your-side instructions, not the number you are after.

What is the difference between Anthropic's EIN and the VAT number on my Claude invoice?

They are two different things for two different tax systems. The EIN is the US federal taxpayer identification number for the entity Anthropic, PBC, used for US purposes like W-9 vendor onboarding and 1099 reporting. It is not printed on Claude invoices. The VAT/GST number you may see on a Claude invoice is a non-resident scheme registration (EU OSS, UK HMRC overseas VAT, etc.) that Stripe Tax stamps based on your billing country, and it changes depending on where you are. If you are outside the US and need the invoice tax number, read it off your invoice PDF rather than asking for the EIN.

Which Anthropic entity's tax ID do I need, Anthropic, PBC or Anthropic Ireland?

It depends on which entity is your counterparty. Anthropic's commercial terms name Anthropic Ireland, Limited as the contracting entity for customers in the EEA, Switzerland, and the UK, and Anthropic, PBC for everyone else. If you are a US business onboarding Anthropic as a vendor, you want the EIN of Anthropic, PBC and you obtain it via its US W-9. If you contract through Anthropic Ireland, your finance team needs that entity's Irish tax registration instead, which again comes from the entity directly, not a public list.

Can Fazm pull the EIN off Anthropic's W-9 automatically?

Yes. Fazm is a native macOS app that reads the accessibility tree through AXUIElement rather than screenshotting the screen. When a W-9 PDF is open in Preview, or a vendor portal is open in your browser, the 'Taxpayer Identification Number' field is a labelled element with a role, title, and value that Fazm can read and write into structured data. A plain-English instruction like 'open this W-9, extract the legal name, entity type, address, and EIN, and put each into my vendor spreadsheet' walks the PDF viewer and the spreadsheet together through real accessibility APIs. It works across any macOS app, not just the browser, and it is a finished consumer app, not a developer framework.

The Anthropic, PBC tax ID you want is on a W-9, not a web page

The EIN is real, but it is private, so the honest answer is to request the W-9 and record the number from Part I against Anthropic, PBC. Skip the data brokers, and do not file it in the VAT field.

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