Invoicing in Word or InDesign: when it works and when it breaks

Almost everyone starts this way. You build a template in Word, Pages or InDesign, drop your logo on it and export a PDF. That works, and for a handful of invoices a year there is not much wrong with it. But there is a point where a document template costs you more time and risk than it saves. Here is exactly where that point sits.

When Word or InDesign is fine

Fair is fair: if you invoice a few times a year, always at the same rate, always 21% VAT, always the same client, a template is fine. You do not need a system for something you do four times a year. Fill it in, export a PDF, send it.

It only starts to hurt once variation creeps in: multiple VAT rates, more clients, discounts, or simply more invoices.

Where it breaks

1. You are calculating VAT by hand

This is the big one. In the Netherlands you round VAT per rate, over the summed subtotal, not per line. If an invoice carries lines at 21% and lines at 9%, you first add up all the 21% lines, calculate the VAT on that, and then do the same for 9%.

Calculate per line and add those amounts up, and you sometimes land a cent off. On a single invoice that is not dramatic, but it is your VAT return that inherits the error, and your client who receives an invoice that does not add up.

Nobody does this correctly by hand in Word. A spreadsheet with the right formulas can, but at that point you are building an invoicing tool.

2. Your numbering will eventually break

Invoice numbers have to be sequential: no duplicates, no gaps. Word has no counter. You copy last month’s invoice, change the number, and one day it goes wrong. Two invoices with the same number, or a jump from 2026-014 to 2026-016.

That is exactly the sort of thing you get asked about in an audit, and it is the hardest thing to repair afterwards: the invoices have already gone out.

3. A mandatory field disappears without you noticing

A template you set up once and then copy endlessly will one day be missing something. Your VAT number that you dropped during a redesign, a Chamber of Commerce number that was never on it, or a date left over from the previous invoice.

The checklist of mandatory invoice details covers what has to be there. If something is missing, the invoice is not formally valid and your client may not be able to reclaim the VAT.

4. Reverse charge and the KOR each need specific wording

If you invoice with reverse charge, as a subcontractor in construction for instance, the invoice has to say “btw verlegd” and carry your client’s VAT number. If you fall under the small business scheme (KOR), that needs different wording again.

A generic template carries neither, so you have to remember them yourself. Exactly when you are in a hurry.

5. You have no overview

A folder of .docx files cannot tell you which invoice is still outstanding. Who needs a reminder? What came in this month? That means keeping a second list alongside it, usually in Excel, and that list drifts out of step with reality.

6. You cannot produce an e-invoice

More and more governments and large organisations no longer accept a PDF and want a UBL file: a structured XML file their accounting software reads automatically. Word cannot produce that. Not even with a workaround.

If you invoice a municipality, a hospital or a large client, you will run into this sooner or later.

7. InDesign adds one more: the file lives on one computer

A properly typeset invoice in InDesign genuinely looks better than what most invoicing tools produce. But the file is tied to one machine, with one font licence and one version of the template. Work with someone else, or lose your laptop once, and you cannot send an invoice at all.

For a designer that is a real dilemma, because your visual identity is your craft. The practical middle ground: keep the layout within what an invoicing tool can do, and use InDesign for the work it is actually meant for.

What to do about it

You do not need a full accounting package straight away. The order that works for most people:

1. Stay with your template as long as you send a few invoices a year and the VAT is simple.
2. Move once the VAT varies or the invoice count climbs. That is the point where manual work starts producing errors.
3. Bring your numbering with you. In factuurmaken you set the number you carry on from, so your sequence continues cleanly from your last Word invoice. Your old invoices simply stay where they are: there is nothing to import.

Not sure whether you are there yet? A simple test: in the last three months, have you had to correct an invoice number, or work out whether something had already been paid? Then the template is already costing you more than it saves.