Current as of June 2025. Thresholds and rates change. Verify with the relevant tax authority before registering.

Introduction

Your first international sale just landed. The next question is whether you now have a VAT registration obligation somewhere.

The answer depends on where you're selling, what you're selling, and how much revenue you're generating. Cross certain thresholds in the EU, UK, Australia, or Canada, and VAT registration becomes a legal requirement with penalties for non-compliance.

Most sellers discover their VAT obligation after they've already crossed a threshold. That's when the retroactive liability question gets uncomfortable. This guide is for getting ahead of it: what a VAT number is, when you're legally required to have one, and how to register in the markets that matter most.

What Is a VAT Number?

A VAT number is a unique identifier assigned by tax authorities to businesses registered for Value Added Tax collection. The number follows a standardized format: a country prefix (like "GB" for the UK or "DE" for Germany) followed by 8-12 digits, depending on the jurisdiction.

This differs fundamentally from US business identifiers. While an Employer Identification Number (EIN) simply identifies your business for federal tax purposes, a VAT number grants you legal authority to collect consumption tax from customers. State sales tax permits operate similarly but only within individual US states.

VAT numbers serve three critical functions: they authorize you to charge VAT on sales, enable you to reclaim VAT paid on business purchases, and provide customers with proof that you're a legitimate tax-registered entity. Without a valid VAT number, you cannot legally collect VAT from customers in most jurisdictions.

The format varies by country but remains instantly recognizable to local tax authorities and business customers. For example, a German VAT number might read "DE123456789" while a UK number appears as "GB123456789". Most countries also assign separate domestic reference numbers for internal tax administration, but the standardized VAT number handles all international transactions.

Why You Need a VAT Number

You're legally required to obtain a VAT number once you cross specific sales thresholds or engage in certain business activities in VAT jurisdictions. The most common trigger is selling goods or services to customers in the EU, UK, Australia, or Canada above statutory thresholds.

Digital services sellers face immediate obligations regardless of sales volume. In the EU, selling software, streaming, or digital downloads to consumers triggers VAT from your first sale; register through the One-Stop Shop (OSS) system. The UK and Australia have their own immediate registration rules for digital services, separate from OSS.

Under EU and UK deemed-supplier rules, marketplaces like Amazon are often liable for VAT on B2C sales made through their platform. This does not eliminate your own registration obligations. The more common trigger for sellers is holding stock in-country — storing inventory in an EU warehouse or UK fulfillment center creates a direct registration requirement independent of marketplace sales.

Physical goods sellers trigger registration when they exceed distance selling thresholds. For non-EU sellers there is no threshold — register from the first B2C sale via OSS. The €10,000 figure is a single pan-EU aggregate that applies only to EU-established businesses. The UK requires non-established businesses to register from their first taxable supply.

Cross-border B2B sales require VAT numbers for reverse charge procedures, where your business customer accounts for VAT instead of you charging it upfront.

VAT Registration Thresholds by Country

Registration thresholds determine when you must register for VAT in each country. Cross these revenue limits, and VAT registration becomes mandatory, not optional.

Most EU countries require immediate VAT registration for non-resident sellers, regardless of sales volume. Germany's €22,000 threshold applies only to German businesses; foreign sellers must register from their first sale.

The £90,000 threshold applies to UK-established businesses only. Non-established taxable persons must register as soon as they make any taxable supply in the UK, per HMRC VAT Notice 700/1. Australia and Canada follow similar approaches, treating resident and non-resident businesses equally.

Digital services face different rules. Non-EU sellers providing digital services to consumers must register through the One-Stop Shop portal from the first sale. The €10,000 threshold is a pan-EU aggregate that applies only to EU-established businesses — non-EU sellers have no minimum.

Track your sales monthly, not annually. VAT obligations trigger based on rolling 12-month periods or calendar years, depending on the country. Missing registration deadlines results in penalties that often exceed the VAT owed on your sales.

How to Register for a VAT Number: Step-by-Step

Step 1: Confirm your obligation. Check the threshold for every country where you sell. Many jurisdictions require immediate registration for non-resident sellers, no minimum. Don't wait to cross a threshold before you apply.

Step 2: Gather documents. You'll need company incorporation documents, proof of business address, and a description of your planned sales activities. Non-EU businesses registering in the EU may also need to appoint a local tax representative before the application can proceed.

Step 3: Submit online. The European Commission's OSS system handles EU registration for non-EU sellers. HMRC's online portal covers the UK. Skip paper applications. They add weeks with no upside.

Step 4: Wait, then act fast. UK registration takes roughly 30 days. EU OSS runs 10-15 business days. Australia's simplified non-resident GST registration typically processes within a few business days via the ATO's online portal. The moment your number arrives, start charging VAT on applicable sales. There is no grace period.

Step 5: Set up filing from day one. Most countries require quarterly VAT returns. Missing your first deadline is a harder problem to fix than getting the initial registration right. Build the cadence into your finance calendar before you need it.

EU VAT Registration (OSS)

The One-Stop Shop (OSS) scheme simplifies VAT registration for non-EU businesses selling to European customers. Instead of registering in each EU member state where you exceed thresholds, you register once through OSS and handle all EU VAT obligations from a single portal.

OSS works for distance sales of goods (like e-commerce shipments) and digital services to EU consumers. You register in any EU member state, then declare and pay VAT for all EU sales through that country's tax authority. For non-EU sellers there is no threshold — register from the first B2C sale. The €10,000 aggregate threshold applies only to EU-established businesses selling cross-border within the EU.

Register through the official European Commission OSS portal or your chosen member state's tax authority website. You'll need business registration documents, EU representative details (if required), and bank account information for VAT payments.

OSS quarterly returns cover all EU sales, with payments due by the end of the month following each quarter. The system automatically distributes collected VAT to the appropriate member states based on your sales data.

Non-Union OSS for services generally does not require a fiscal representative. IOSS, however, typically requires an EU-based intermediary to act on your behalf — check the requirements in your chosen member state before registering.

UK VAT Registration

UK VAT registration happens through HMRC's online portal, which requires basic company information, estimated taxable turnover, and details about your business activities. You'll need your company registration number, bank details, and evidence of your trading activities before starting the application.

The registration process typically takes 30 days from submission to receiving your VAT number, though HMRC can request additional documentation that extends this timeline. Complex business structures or non-UK entities may face longer processing times. If you are not UK-established, do not wait for any threshold — register before your first taxable UK sale.

Once registered, UK VAT returns are due quarterly, with payment due one month and seven days after the quarter ends. Most businesses file online through HMRC's Making Tax Digital platform, which became mandatory for VAT-registered businesses in 2019.

HMRC assigns your 9-digit VAT number immediately upon approval, and you must begin charging VAT on qualifying sales from your registration date. Late registration triggers penalties and potential back-dating of your VAT obligation, making early application essential for businesses approaching the threshold.

Other Key Markets (Australia, Canada)

Australia requires non-resident businesses selling goods or services to Australian consumers to register for GST once turnover exceeds AUD $75,000 annually. Non-residents register under the simplified GST registration scheme and receive an ATO Reference Number — not an ABN, which is reserved for businesses with an Australian presence. Register directly through the ATO's online portal.

Canada operates under GST/HST (Goods and Services Tax / Harmonized Sales Tax) depending on the province. Non-resident businesses selling digital products or services to Canadian consumers may register under the simplified GST/HST registration framework introduced in 2021, which applies once taxable supplies exceed CAD $30,000 over four consecutive calendar quarters. The process runs through the Canada Revenue Agency's online services.

Both countries treat their consumption taxes similarly to European VAT systems — you collect tax from customers and remit to the government. The key difference is registration thresholds and local compliance requirements, not fundamental tax mechanics.

How to Look Up a VAT Number

Verify any VAT number through official government databases before conducting business. The VIES system handles all EU member states: enter the country code and number to confirm registration status and business name. UK companies use the HMRC VAT checker, which provides the same validation plus registration date.

For Australia, verify GST registration status through the ATO's ABN Lookup tool. Note that non-resident businesses registered under the simplified GST scheme receive an ATO Reference Number, not an ABN — the lookup tool covers both. These systems update in real-time, so you'll catch deregistered or suspended numbers immediately.

Always validate VAT numbers before issuing invoices. A revoked number means you cannot claim input tax credits, and charging VAT without a valid registration creates compliance problems. Print the validation result for your records. Tax authorities expect proof of due diligence during audits.

Common VAT Registration Mistakes

Registering after you're already selling is the costliest mistake. You become liable for VAT the moment you cross a threshold or make your first taxable sale in many jurisdictions, not when you finally register weeks later. Late registration penalties can be substantial — denominated in pounds for the UK, euros for EU member states — and often accrue before you've collected your first VAT payment.

Registering in the wrong country wastes time and money. US companies selling digital services to German customers don't need German VAT registration. They need EU OSS registration through any member state. Similarly, selling physical goods from a UK warehouse requires UK registration, not registration in your customer's country.

Ignoring digital services rules catches software and SaaS companies off-guard. The EU's destination principle means you owe VAT where your customer is located, regardless of where your servers sit. There is no threshold for non-EU B2C digital sales into the EU. You are liable from the first sale.

Missing marketplace facilitator obligations creates double-jeopardy scenarios. Amazon may collect VAT on your behalf in some countries but not others. Assuming universal coverage leaves you exposed to penalties for uncollected tax on direct sales through the same platforms.

Frequently Asked Questions

How long does VAT registration take? Timeline varies by jurisdiction. UK VAT registration typically takes 30 days through HMRC's standard service, though straightforward applications sometimes clear faster. EU registrations through the One-Stop Shop run 10-15 business days. Australia's simplified non-resident GST registration typically processes within a few business days via the ATO's online portal.

Can I sell without a VAT number if I'm below the threshold? Yes, but only until you cross the registration threshold. Once you exceed the limit, you must register and account for VAT from that date. You cannot charge VAT to customers until your number is issued, but you do not have to stop selling.

Do I need a VAT number for every country I sell to? Not necessarily. The EU's One-Stop Shop lets you register in one member state and sell to all others. However, you need separate registrations for the UK, Australia, Canada, and other non-EU markets.

What happens if I miss the registration threshold deadline? Tax authorities impose penalties ranging from fixed fines to percentage-based charges on unpaid VAT. UK penalties for late registration are based on the unpaid VAT amount and the length of delay — see HMRC's late registration penalty guidance for current rates. EU penalties vary by member state but can reach substantial amounts plus interest on outstanding VAT denominated in euros.

Can I register for VAT before hitting the threshold? Yes, voluntary registration is allowed in most countries and can be beneficial if you have significant VAT-eligible expenses or want to appear more established to business customers.

Conclusion

VAT registration is not complicated in isolation. One country, one threshold, one filing cadence. Manageable. The problem is that international growth doesn't stop at one country. Each new market adds its own threshold, its own registration portal, its own return schedule, and its own penalty structure for getting it wrong.

Most companies handle the first registration manually. By the third or fourth jurisdiction, the spreadsheet breaks down.

Taxwire manages VAT registration and ongoing filings for non-established foreign entities selling into the EU (OSS, IOSS, and local VAT), UK, Canada, Australia, and New Zealand. Each jurisdiction is handled by an in-house tax team, not routed through a third party. If you're approaching that inflection point, it's worth a conversation before the penalties start.