Freelancing has become increasingly global, and many developers, designers, consultants, and marketers across the UK and Europe now work with companies in the United States. The US market is large, budgets are often higher than equivalent European engagements, and demand for specialist skills is consistent. But invoicing international clients creates friction that domestic work does not — currency differences, international payment delays, unfamiliar contract and tax documentation, and US companies' preference for domestic vendors all add up to real commercial cost.
This guide covers everything a UK or EU freelancer needs to know to invoice US clients professionally and get paid efficiently. For the most direct solution to cross-border payment friction, see our case study on a European consultant building a US client base.
Why Professional Invoicing Matters
A well-prepared invoice does more than document a transaction. It signals that you operate professionally, establishes clear payment expectations that reduce disputes, provides the records your client needs for their accounts payable process, and gives you the paper trail required for your own tax reporting. US companies — particularly startups and technology businesses — often have structured procurement and accounts payable processes. An invoice that does not meet their expectations can delay payment or trigger additional back-and-forth with their finance team.
What Every Invoice Must Include
A professional invoice to a US client should always contain:
- Your name or business name — and your address and contact information
- The client's company name and address
- A unique invoice number — sequential numbering keeps your records clean
- Invoice date and payment due date — based on your agreed payment terms
- A clear description of services provided — specific enough that the client's accounts payable team understands what was delivered
- The total amount due and currency — state the currency explicitly (USD, GBP, EUR)
- Payment terms — Net 7, Net 14, or Net 30 are standard; Net 7 or Net 14 is preferable for international work where payment delays are more likely
- Payment instructions — bank details, Stripe link, or other accepted payment method
Which Currency Should You Invoice In?
Invoicing in USD is the most practical choice for US clients. It removes a step from their accounts payable process (they do not need to calculate a currency conversion), aligns with their internal budget tracking, and eliminates disagreements about exchange rates on the payment date. The currency risk falls on you rather than the client — but with platforms like Wise Business offering near mid-market exchange rates, converting USD to GBP or EUR is inexpensive and fast.
Invoicing in GBP or EUR is also acceptable and some clients will accommodate it without friction, particularly larger companies with international treasury operations. The most important thing is stating the currency clearly on every invoice and agreeing it with the client before the first invoice is sent.
Payment Platforms for Cross-Border Freelancers
Traditional international bank wires are slow, expensive, and create unnecessary friction for US clients who are not accustomed to SWIFT payment processes. Modern payment platforms are significantly better for freelance work:
- Stripe — the gold standard for professional online payments; allows clients to pay by card without creating an account; works seamlessly with a US LLC bank account
- Wise Business — excellent for receiving USD and converting to GBP or EUR at competitive rates; provides local US account details
- PayPal — widely recognised by US clients but carries higher fees than Stripe; useful as a backup option
- Payoneer — popular among freelancers on platforms like Upwork; less relevant for direct client relationships
Using a US LLC for Invoicing
Freelancers who regularly work with US clients — or who want to grow their US client base systematically — find that invoicing through a US LLC removes most of the friction described above. Instead of a foreign invoice requiring international wire transfer, your US LLC issues a domestic invoice payable to a US bank account. US clients process it through their normal accounts payable workflow. Payment arrives in your Mercury or Relay account in one to two business days via ACH, rather than three to five business days via international wire.
A Wyoming LLC is the most common choice for UK and European freelancers. It has low formation and annual fees, no state income tax, and strong privacy protections. For a detailed account of what this structure change means in practice, see our case study on a European consultant building a US client base and our guide on starting a Wyoming LLC as a freelancer.
Managing Late Payments
Clear payment terms reduce late payments but do not eliminate them. Practical steps that help: send invoices immediately on project completion rather than at month end, include a payment link on the invoice so the client can pay in one click, follow up politely on day one after the due date (a simple email reminder is standard practice and not considered pushy in the US), and consider adding a late payment clause to your contracts — typically 1.5% per month on overdue balances is accepted in US commercial practice.
Ready to Set Up Your US Invoicing Structure?
We help UK and European freelancers and founders form US LLCs remotely — including EIN applications, banking setup guidance, and ongoing compliance support through our licensed Enrolled Agent Richard Williams.
Case Study: European Consultant Building a US Client Base
How to Start a Wyoming LLC as a Freelancer
US Banking Documents Checklist
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