The Core Decision: Whose Currency, Whose Risk?
When you send an invoice denominated in a foreign currency, you are making an implicit choice about who carries foreign exchange risk. Bill in GBP and you bear the risk that GBP weakens against EUR before payment arrives. Bill in EUR and your client carries that risk instead.
Understanding this is the foundation of all multi-currency invoicing strategy.
Billing in EUR (your functional currency)
- You know exactly what you earn
- Simpler bookkeeping — no conversion entries needed
- Client may need to convert, which creates a friction point
- Appropriate for: long-term retainers, clients who use EUR-denominated suppliers, projects under €2,000 where the admin of managing two currencies is not worth it
Billing in client's local currency (GBP, USD, CHF, etc.)
- Client experience is smoother — they see a familiar amount
- You absorb FX risk and must convert on receipt
- Gives you a competitive edge against domestic suppliers
- Appropriate for: competitive tender situations, large clients with rigid procurement systems, clients whose finance teams cannot process foreign-currency invoices easily
A Decision Framework for EU Freelancers
Run through this checklist for each new client or project:
| Question | Bill in EUR if… | Bill in Client Currency if… |
|---|---|---|
| Contract value | Under €5,000 | Over €5,000 (FX exposure matters more) |
| Relationship type | One-off project | Ongoing retainer |
| Currency volatility | EUR/client FX stable (<3% annual range) | High volatility pair (e.g., EUR/TRY, EUR/GBP) |
| Client sophistication | Large company with multi-currency AP | Small business unfamiliar with FX invoices |
| Your FX costs | You use Wise/Revolut (low fees) | You rely on bank transfers (high fees) |
| Competition | No local competitors | Competing against domestic suppliers |
If most of your answers point one way, that is your currency. If they split, lean toward billing in EUR — it is simpler and the margin protection is worth the minor client friction.
The Hidden Cost of Billing in a Foreign Currency
Suppose you are a Dutch software developer billing a US startup $8,000 per month. At the moment you agree the contract, EUR/USD is 1.08, so you expect €7,407 per month. Six months later, the dollar weakens to 1.14. Your $8,000 invoice now converts to €7,018 — a drop of €389 per month, or €2,334 over those six months. That is money you did not budget for losing.
This is not a rare scenario. EUR/USD moved from 1.04 to 1.13 across a 14-month period in 2024–2025. A Polish developer on a $6,000/month USD contract would have seen their euro income vary by over PLN 1,200 per month purely from FX movement.
Three ways to manage this if you must bill in foreign currency:
- Build an FX buffer into your rate. Quote $8,400 instead of $8,000 and use the extra to absorb rate movements. This is crude but effective for one-off projects.
- Review rates quarterly. Include a clause that rates are reviewed every 90 days based on the ECB rate. Many clients accept this for long contracts.
- Convert regularly. Do not let foreign-currency income accumulate. Convert monthly via Wise or Revolut to lock in the current rate rather than gambling on a future one.
How to Show a Currency Conversion on the Invoice Itself
When you invoice in a foreign currency but need to show the EUR equivalent (for VAT reporting or your own records), format it clearly:
Services rendered: web development, March 2026 Amount: $8,000.00 USD EUR equivalent: €7,143.00 (ECB rate 1 USD = 0.8929 EUR, 31 March 2026)
If VAT applies (e.g., you are billing an EU client in USD, which is unusual but possible), the VAT must be calculated in euros:
Subtotal: $8,000.00 USD (€7,143.00) VAT 21% (NL): €1,500.03 Total EUR: €8,643.03 Total USD equivalent: $9,680.00 (indicative)
Note the word "indicative" on the foreign-currency VAT total — this signals to the client and your accountant that the definitive amount is in euros.
VAT Implications of Multi-Currency Invoicing
VAT is where multi-currency invoicing gets complicated. The key scenarios:
Eurozone freelancer billing another EU business (B2B) Apply the reverse charge mechanism. You do not charge VAT; the client self-accounts for it in their jurisdiction. The invoice currency does not affect this — just ensure your invoice includes both parties' VAT numbers and the note "VAT: Reverse charge applies."
Eurozone freelancer billing an EU consumer (B2C) VAT is due in the client's country under the One Stop Shop rules for digital services, or in your country for most other services. You must convert to euros for the VAT filing regardless of the invoice currency.
EU freelancer billing a non-EU business Generally outside the scope of EU VAT (B2B export rule). Invoice in whatever currency is agreed. Record the euro equivalent for your accounts using the ECB rate on invoice date or payment date.
Practical Step-by-Step: Issuing a Multi-Currency Invoice
- Agree the currency upfront. Confirm in the contract or project proposal — do not leave it ambiguous.
- Fix the invoice currency. Do not put two amounts as the "payable" total — pick one currency as the amount due.
- Add a reference conversion. Show the other currency as informational, with rate source and date.
- State payment terms clearly. If the client pays in a different currency than invoiced, note who bears the conversion cost.
- Record the actual receipt. When payment arrives, record the actual EUR equivalent in your accounting software — this is what matters for tax, not the invoice amount.
- Track exchange gains and losses. The difference between your invoiced EUR equivalent and the actual EUR received is an exchange gain or loss. In many EU countries, this is taxable income or a deductible expense.
When Billing in Local Currency Makes Financial Sense
For a Spanish freelancer with a £40,000/year UK client base, billing in GBP and using Wise Business to receive and convert is often the optimal setup. Wise charges approximately 0.4–1.2% on GBP-to-EUR conversions, compared to 2.5–4% for a bank transfer. On £40,000, that is a saving of roughly £840–1,440 per year — more than enough to justify the slightly more complex bookkeeping.
The math changes at lower volumes. If you have one UK client paying £3,000 per year, the admin overhead of maintaining a foreign-currency account and doing regular conversions is not worth it. Invoice in EUR, let them convert, and move on.
Ready to check the current EUR/GBP or EUR/USD rate before you raise your next invoice? The EU Biz Tools Currency Converter shows live mid-market rates alongside the ECB daily reference rate — no account required, no ads, just the number you need.