Blog — Tips and guides on invoicing, VAT and freelancing

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Invoicing

Credit note versus corrective invoice: which one when?

You've sent an invoice that's no longer correct. Can you adjust it? Or do you need a credit note? The difference — and the legal rules.

15 Apr 2026 3 min

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Invoicing

Invoice Numbering: Rules, Structure and Most Common Mistakes

Sequential, unique and without gaps — the rules for invoice numbering sound simple, but in practice things often go wrong.

10 Apr 2026 3 min

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Invoicing

Invoice retention requirements: how long and in what format must you keep them?

Tax authorities require 7 years of retention (10 years for real estate). Can that be digital? And what if you have a shoebox full of paper?

31 Mar 2026 3 min

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Invoicing

PEPPOL e-invoicing becomes mandatory: what does this mean for your business?

From 2030 onwards, e-invoicing via PEPPOL will be mandatory within the EU. What exactly is PEPPOL, and how do you prepare?

26 Mar 2026 3 min

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Invoicing

Mandatory invoice details in the Netherlands: what really needs to be on your invoice?

An invoice without the correct information can be rejected by the Tax Authority — and your customer won't get their VAT back. These are the...

11 Mar 2026 3 min