Cash flow doesn’t collapse with a bang. It frays at the edges: a paid bill without the right document, a cost booked on “whatever was in the inbox,” a VAT return that looks fine until it’s questioned. One of the quietest troublemakers is the order confirmation. It feels official, it has a price, and it proves you agreed. But in your administration, an order confirmation is not the same thing as an invoice and the Tax Office (Belastingdienst) treats them very differently.

An orderbevestiging is a commercial document: it confirms what you ordered and under what terms. That’s useful for avoiding misunderstandings with a supplier or client. An invoice (factuur) is an accounting and tax document: it’s the formal request for payment and the document that ties a transaction to your bookkeeping, your VAT (btw) position, and your financial results. In plain language: the order confirmation tells you what should happen; the invoice proves what was charged.

This is also where the Tax Office’s perspective matters. In a VAT check, they don’t debate your intentions, they look for evidence. If you reclaim VAT, the basic expectation is that you can show a proper invoice with the required details (who supplied what, when, for what amount, and how VAT was applied). An order confirmation usually doesn’t meet that standard. And if your costs are booked without a proper invoice behind them, you’re creating a weak spot: not because the expense isn’t real, but because you can’t prove it cleanly when asked.

The practical fallout shows up at exactly the wrong time. You pay quickly because you want to keep trust with a supplier. You file the order confirmation because it’s what you have. Months later, you need the invoice for your accountant, for a VAT correction, or because a supplier reminder arrives for an invoice you never received. Now you’re spending time chasing documents, explaining mismatches between bank payments and bookings, and cleaning up a period that should already be closed. That’s not “admin”; that’s distraction with a price tag.

You don’t need a complicated process to fix this, just a sharper habit. Treat the order confirmation as a trigger to expect an invoice, not as a substitute for one. If you pay before the invoice arrives, mark it internally as “paid, invoice missing” and follow up until it’s received, then match it to the payment and book it properly. If you’re working with suppliers who send confirmations but are slow with invoices, push back calmly: “Thanks, please send the official invoice for our administration.” It’s a small sentence that prevents a big mess.

The point isn’t to be rigid. It’s to keep your business easy to run. When your documents line up, order confirmation for clarity, invoice for accounting, you protect your VAT position, reduce correction work, and make your numbers trustworthy when you need them most. That’s the kind of boring discipline that keeps a small business free: fewer surprises, fewer phone calls, and a calmer relationship with the Tax Office.