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If you invoice international clients, you've probably run into the tax ID question. Your client in London wants your VAT number. Your Australian client asks for an ABN. Your US client needs an EIN for their 1099 filing.

The rules are different in every country, and getting them wrong means delayed payment — or worse, an invoice that isn't legally valid.

This guide covers the tax identification requirements for the most common freelancer invoicing scenarios, country by country. It's focused on what you actually need to put on your invoice, not tax advice — for that, talk to an accountant in your jurisdiction.

Why Tax IDs Belong on Every Invoice

Tax IDs serve two purposes:

For the sender: They identify you as a registered business or self-employed individual in your tax system. This lets you collect and remit tax correctly.

For the buyer: They use your tax ID to claim input tax credits, comply with local reporting requirements, and prove the expense is legitimate. A company's finance team cannot process your payment without proper tax identification — it's not optional for them.

When both parties are in the same country, the rules are relatively straightforward. When you're invoicing across borders, both the sender's and receiver's tax IDs may be required.

United States

The US doesn't have a VAT system. Instead, businesses use several types of tax identification numbers.

EIN (Employer Identification Number)

Issued by the IRS. Required for businesses with employees, but freelancers can also get one to avoid putting their Social Security Number on invoices.

Format: XX-XXXXXXX (9 digits with a hyphen)
Who needs it: LLCs, corporations, partnerships. Sole proprietors can use their SSN, but many prefer an EIN for privacy.
When it goes on an invoice: Include it when invoicing US companies, especially if your annual revenue from a single client exceeds $600 — they'll need it to file a 1099-NEC form.

SSN (Social Security Number)

US sole proprietors without an EIN use their SSN as their tax ID.

When it goes on an invoice: Only if you don't have an EIN and the client requires a tax ID for their records.
Privacy concern: Many freelancers get an EIN specifically to avoid sharing their SSN on invoices. You can apply for an EIN online at irs.gov in about 5 minutes.

What US clients expect on your invoice

Your tax ID (EIN or SSN) if you're a US-based freelancer
If you're outside the US: your local tax ID (VAT number, business number, etc.). The client may also ask you to complete a W-8BEN form to certify your foreign status.

United Kingdom

The UK operates a VAT system that's particularly relevant for freelancers earning above the registration threshold.

VAT Registration Number

Format: GB 123456789 (GB + 9 digits)
Mandatory threshold: £90,000 annual turnover (as of 2026). Once you cross this, you must register for VAT.
Voluntary registration: You can register below the threshold, which some freelancers do to reclaim VAT on business expenses.

When VAT goes on your invoice

If you're VAT-registered, your invoices must include:

Your VAT registration number
The applicable VAT rate (standard 20%, reduced 5%, or zero-rated)
The VAT amount as a separate line item

If you're not VAT-registered, you don't include a VAT number — simply leave it off.

UTR (Unique Taxpayer Reference)

Issued by HMRC to every self-employed person in the UK. It's used for self-assessment tax returns, not typically displayed on invoices. Your VAT number (if registered) goes on the invoice instead.

European Union

EU VAT rules are some of the strictest in the world when it comes to invoice requirements. If you're invoicing a business in another EU member state, both VAT numbers must appear on the invoice for the reverse charge mechanism to apply.

VAT Number Format by Country

Country	Prefix	Example
Germany	DE	DE123456789
France	FR	FR12345678901
Netherlands	NL	NL123456789B01
Spain	ES	ESA12345678
Italy	IT	IT12345678901
Ireland	IE	IE1234567AB
Belgium	BE	BE0123456789
Sweden	SE	SE123456789001

The Reverse Charge Rule

When a VAT-registered freelancer in one EU country invoices a VAT-registered business in another EU country, the VAT is "reverse charged." This means:

You don't charge VAT on the invoice
You include both your VAT number and the client's VAT number
You add the note: "Reverse charge — VAT is accounted for by the recipient"

This is the most common scenario for EU-based freelancers working cross-border. Both VAT numbers must be present on the invoice for this to be valid. If either number is missing, the invoice may not be legally compliant, and the client's AP team will likely reject it.

VAT Registration Thresholds

Unlike the UK, most EU countries have no threshold for VAT registration for B2B services. If you're providing services to businesses, you typically need to register regardless of your revenue. Check your specific country's rules.

Australia

ABN (Australian Business Number)

Format: 11 digits (e.g., 53 004 085 616)
Who needs it: Any business operating in Australia, including sole traders. Not strictly required by law, but practically necessary — businesses you invoice are required to withhold 47% tax from your payment if you don't provide an ABN.

This alone is reason enough to get an ABN if you're an Australian freelancer. Nearly every client will ask for it.

GST Registration

Threshold: A$75,000 annual turnover
GST rate: 10%
Tax invoice requirements: If you're GST-registered, your invoices must say "Tax invoice," include your ABN, show the GST amount, and state the total including GST.

What Australian clients expect

Your ABN on every invoice. If you're GST-registered, a properly formatted tax invoice. If you're not registered for GST, your invoice should state "Not registered for GST" to avoid confusion.

Canada

Business Number (BN)

Format: 123456789 RT0001 (9-digit BN + 2-letter program ID + 4-digit reference)
Who needs it: Any business registered for GST/HST in Canada
Threshold: C$30,000 annual revenue for GST/HST registration

GST/HST Number

This is the BN with an "RT" program identifier. It goes on your invoices if you're registered for GST/HST.

GST rate: 5% (federal)
HST rate: Varies by province (13% in Ontario, 15% in Atlantic provinces)

What Canadian clients expect

Your GST/HST number if you're registered. If you're a small supplier (under C$30,000), you don't need to register and your invoice won't include a GST number — but you also can't charge GST.

India

GSTIN (GST Identification Number)

Format: 22AAAAA0000A1Z5 (15-digit alphanumeric: state code + PAN + entity code + check digit)
Who needs it: Any business with annual turnover exceeding ₹20 lakhs (₹10 lakhs for northeastern states)
GST rate: Varies — 5%, 12%, 18%, or 28% depending on the service

What Indian clients expect

Your GSTIN on every invoice if you're registered. Indian GST invoices are highly prescriptive — they must include your legal name, GSTIN, the client's GSTIN (if registered), place of supply, HSN/SAC codes, and the applicable tax rates.

Invoicing clients outside India

If you're an Indian freelancer invoicing an overseas client for services (software development, design, consulting), the export is typically zero-rated under GST. Your invoice should state "Export of services" and include your GSTIN. You'll need to file this correctly to claim a refund of input tax credits.

Cross-Border Invoicing: The Practical Checklist

When you're invoicing a client in a different country, include:

Your tax ID (whatever type your country uses — EIN, VAT, ABN, GSTIN, etc.)
Your client's tax ID (if they've provided one — ask if you're unsure)
The currency (always state this explicitly — InvoiceCraft supports 20 currencies)
Your legal name as registered with your tax authority
Your registered address

Many invoice generators only include one tax ID field. If you're invoicing internationally, look for a tool that supports separate tax IDs for both sender and receiver — it's essential for EU reverse charge invoices and increasingly expected by AP departments everywhere.

For more on the specific invoice fields that AP departments require (including PO numbers and payment terms), see our guide to why AP departments reject invoices.

Frequently Asked Questions

Do I need a tax ID if I'm just starting out as a freelancer?

It depends on your country. In the US, you can use your SSN initially, but getting an EIN is free and takes minutes. In Australia, you need an ABN to avoid withholding tax. In the EU, VAT registration for B2B services is often required from the first euro of revenue. Check your local rules.

What if my client doesn't provide their tax ID?

Ask for it. Most companies expect this question and have their tax ID ready to share. If they refuse or say they don't have one, note "Not provided" in the client tax ID field on your invoice. For EU reverse charge invoices, though, the client's VAT number is mandatory — without it, you may need to charge VAT at your local rate instead.

Can I use one tax ID for all countries?

No. Tax IDs are country-specific. Your US EIN doesn't satisfy EU VAT requirements, and your Australian ABN doesn't help a Canadian client. If you work with clients in multiple countries, you display whichever tax ID is relevant to each client.

What's the difference between a tax ID and a VAT number?

A tax ID is a broad term for any number used to identify you for tax purposes. A VAT number is a specific type of tax ID used in countries with a Value Added Tax system. In the US, the equivalent tax ID is an EIN or SSN, but there's no VAT number because the US doesn't have VAT.

Do I need to include tax on invoices to clients in other countries?

It depends on the countries involved and the type of service. EU cross-border B2B services are reverse charged (no VAT on the invoice). US companies don't charge VAT. For other combinations, the rules vary — this is where a local accountant's advice is worth the cost.

Need an invoice generator that supports separate tax ID fields for sender and receiver, plus 20 currencies? Try InvoiceCraft — free, no signup, no limits.