Will a Dutch client accept an English invoice?
Often yes, especially with international clients. Complete NL fields matter more than the language alone.
For Polish-speaking ZZP in the Netherlands
Dutch invoice with a Polish interface: UI language vs document language
Working “in Polish” does not mean issuing a Polish-market invoice. Keep a Polish UI and still send a correct NL or EN document with KvK and VAT details.
All guidesTwo languages — two different meanings
UI language is how you navigate the product every day. Document language is what the client and bookkeeper read.
SmartWerk lets you work in Polish while preparing the client PDF in Dutch or English — without forcing an all-Dutch interface.
What a Dutch invoice must include
Even with a Polish UI, the document must follow NL rules: parties, KvK, VAT ID when applicable, number and dates, lines, VAT and payment details.
See the full field checklist in the Dutch ZZP invoice requirements guide.
- Your business and client name and address.
- KvK and VAT ID when applicable.
- Unique invoice number and issue date.
- Net / VAT / gross amounts and IBAN.
Glossary: common Dutch invoice labels
When the client receives a Dutch PDF, these labels help you verify the document quickly:
- Factuurnummer — invoice number.
- Factuurdatum — issue date.
- Vervaldatum — due date.
- KvK-nummer — Chamber of Commerce number.
- BTW-id — Dutch VAT number.
- Excl. BTW / BTW / Incl. BTW — net / VAT / gross.
- IBAN — bank account for transfer.
- Omschrijving — description of the service or product.
- Bedrag — amount.
- Betalingskenmerk — payment reference.
How to set document language in SmartWerk
Keep the UI in Polish. On the invoice, choose the document language for the client (Dutch or English). The PDF and client email follow that choice.
Dutch invoice vs Polish e-invoice / KSeF
KSeF covers the Polish e-invoice flow. A ZZP invoice in the Netherlands follows NL rules — it is not automatically the same process as in Poland.
If you need a Netherlands-first tool with a Polish panel, SmartWerk fits that scenario. We do not claim KSeF or full bookkeeping.
Who this model is for (and when eFaktura may fit better)
Choose SmartWerk when you want a Polish panel, NL/EN invoices, quotes, contracts, CV and reminders in one workflow, plus a stronger free start without a card.
eFaktura may fit better if you need a mobile app every day, mileage / hour tracking, or Peppol/KSeF on a paid plan right now. Details: SmartWerk vs eFaktura.
Frequently asked questions
Can I make a bilingual invoice?
In SmartWerk you pick the main document language for the client. Write line descriptions so the client understands them.
Does a “Dutch invoice” require a Dutch UI?
No. The UI can stay Polish; set the client document to Dutch or English.
Does SmartWerk issue KSeF invoices?
No. SmartWerk is built for ZZP in the Netherlands, not the Polish KSeF system.
Should line items be translated to Dutch?
Use wording the client understands. For a Dutch-speaking client, NL or clear agreed English works well.
Where do I enter KvK and VAT so they appear on the PDF?
In your business profile. SmartWerk fills them on the invoice — check the preview before sending.
Related guides
How to send a ZZP invoice in the Netherlands: KvK, VAT ID and checklist
A practical Dutch ZZP invoice checklist for expat freelancers: KvK, VAT ID, invoice numbering, VAT, IBAN and client details.
VAT reverse charge for EU clients: Dutch ZZP invoice guide
When should a Dutch ZZP freelancer use VAT reverse charge? A practical guide for EU B2B invoices, VAT IDs and required wording.
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A practical contract checklist for ZZP freelancers in the Netherlands: scope, price, payment, confidentiality, liability and Wet DBA.
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Payment reminder for an overdue invoice in the Netherlands: a ZZP guide
A practical guide for freelancers in the Netherlands: how to send a payment reminder, what to include and how B2B and consumer cases differ.
First ZZP invoice in the Netherlands in 5 minutes (step by step)
How to create your first Dutch ZZP invoice: KvK/VAT/IBAN profile, client, line items, PDF and a client payment-details link — not Polish KSeF.
BTW and KOR for ZZP in the Netherlands: when to charge VAT
Dutch BTW, VAT ID and the KOR (Kleine Ondernemersregeling) for freelancers: €20,000 threshold, invoices without VAT, pros and cons, and what to set in SmartWerk.
Quote → invoice → reminder: ZZP workflow in the Netherlands
Run the full Dutch ZZP chain: quote (offerte), convert to invoice, payment link and payment reminder — without spreadsheets or lost email threads.
Work in Polish, invoice for the Netherlands
Polish UI, Dutch or English document, KvK / VAT / IBAN fields. Also see SmartWerk vs eFaktura if you are choosing a tool.
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