Anthropic's VAT number is not one number. It is nine jurisdiction-specific scheme IDs, and the one you need is on your own Claude invoice.

There is no single VAT number. Anthropic, PBC is a US Delaware public benefit corporation at 548 Market St, PMB 90375, San Francisco, CA 94104. It has no US federal VAT because the US does not use VAT, and it is not established in the EU or UK. Claude billing runs on Stripe Tax under the various non-resident digital services schemes (EU OSS non-union, UK HMRC VAT for overseas sellers, Norway VOES, Australia ARN, Canada GST/HST for non-residents, Switzerland non-resident VAT, Singapore GST OVR, Japan JCT for foreign providers, New Zealand GST for remote services). Under each scheme Anthropic holds a separate registration number, which appears on invoices sent into that jurisdiction and nowhere else. The number you need is the one on your own Claude invoice PDF, under the 'Supplier tax ID' or 'Tax ID' line, because it matches your billing country.

Open your invoice PDF from claude.ai/settings/billing or console.anthropic.com/settings/billing. Under the seller block at the top (which reads 'Anthropic, PBC, 548 Market St, PMB 90375, San Francisco, CA 94104'), Stripe Tax renders a line labelled 'Tax ID' or 'Supplier tax ID' or 'VAT number'. That line carries the jurisdiction scheme prefix plus the registration digits (for example a GB-prefixed HMRC number on a UK invoice, an EU-prefixed OSS number on an EU invoice, a CHE-prefixed number on a Swiss invoice). If the line is missing on your invoice, it usually means your billing country does not require Anthropic to charge tax under any scheme, in which case there is no supplier VAT to record.

The Dublin entity (Anthropic Ireland, Limited, CRO 760497, incorporated 22 March 2024 at 6th Floor South Bank House, Barrow Street, Dublin 4) and the UK entity (Anthropic Limited, Companies House 14604577, 9th Floor 107 Cheapside, London EC2V 6DN, incorporated 19 January 2023) are operational EMEA subsidiaries, not invoicing entities for Claude as of April 2026. Claude billing is still run from the US parent under non-resident schemes processed by Stripe Tax. That means your invoice seller line is Anthropic, PBC in San Francisco, and the supplier tax ID is Anthropic's registration in your jurisdiction's non-resident scheme.

An EU OSS Non-Union scheme number starts with 'EU' followed by nine digits and does not validate in the standard VIES VAT checker (which is for EU-established businesses). OSS Non-Union numbers are maintained by the member state of identification (for Anthropic, typically published on the invoice itself rather than on a public register). UK HMRC VAT numbers (format GB + 9 digits) for overseas sellers can be checked via the HMRC VAT Number Check service. Switzerland (CHE + 9 digits + MWST) is validated in the UID register at uid.admin.ch. Australia ARN is looked up via the ABN Lookup site. For the other schemes (Norway VOES, Japan JCT, Singapore GST OVR, New Zealand GST, Canada GST/HST for non-residents) the authoritative source is the printed invoice plus the relevant tax authority's lookup tool.

Enter the exact tax ID string that appears on your Claude invoice PDF, including its country-code prefix (GB, CHE, EU, etc.). Enter the seller as 'Anthropic, PBC' with the San Francisco address. Flag the supplier as a non-established taxable person under the relevant scheme (your accounting tool will have a checkbox like 'Overseas supplier with UK VAT registration' or 'Non-EU supplier under OSS non-union'). If you are a B2B customer in the EU or UK with your own valid VAT number entered in Claude billing, your next invoice should show 0% VAT under the reverse charge and the supplier tax ID line may disappear or be replaced by a reverse-charge note. Always confirm the final treatment with your local tax advisor.

Four reasons. First, your billing address country may have changed, which moves you to a different scheme and rate. Second, Anthropic may have registered under a new scheme in your country mid-year (this happens as platforms scale into new jurisdictions). Third, you may have added or removed your own business VAT ID in Claude billing, which switches reverse charge on or off. Fourth, currency conversion timing can shift the displayed VAT slightly when the underlying charge is in USD but shown in your local currency. The 'Tax' line on the invoice will always print the rate applied and the scheme reference, so a side-by-side diff of two invoices tells you exactly which of the four shifted.

Yes, but it is a US EIN, not a VAT number. Anthropic, PBC is a Delaware public benefit corporation and has a US Employer Identification Number used for US federal tax purposes. The EIN is not printed on Claude invoices and Anthropic does not publish it for general use; it is exchanged via a signed W-9 when a US customer or partner requires it for 1099 or onboarding. For US state sales tax, Anthropic collects where it has economic nexus, and those state registrations appear on invoices to buyers in the affected states (for example a Texas sales tax permit number on a Texas buyer's invoice). Outside the US, the EIN is not useful and your AP system's VAT field is the wrong place for it.

Yes. Fazm is a consumer Mac app that reads the macOS accessibility tree through AXUIElement rather than taking screenshots. When a Claude invoice PDF is open in Preview or the invoice portal is open in Safari or Chrome, Fazm sees 'Supplier tax ID' as a labelled text element and can extract the value into structured data. A plain English instruction like 'open my Claude invoices for this quarter, extract seller name, seller address, supplier tax ID, invoice date, and total, and paste each row into my supplier spreadsheet' will walk Claude billing, the PDF viewer, and a spreadsheet together through real accessibility APIs. It works with any macOS app, not just the browser, and it is a finished consumer app, not a developer framework.