If you're missing invoices, you're probably paying more tax than you should.
Not because you did anything wrong. Not because the system is out to get you. Just because a few documents went missing — and nobody noticed until it was too late.
This applies to any company subject to IRC: Lda, SA, or any other legal structure. If that's you, read on.
Invoice requirements for VAT deduction in Portugal: the rule nobody explains
In Portugal, VAT deduction requires a valid invoice. That's it. That's the rule.
Can I claim VAT without an invoice in Portugal? No. Never. It doesn't matter that you paid. It doesn't matter that the expense was 100% legitimate. Without the document, the tax authority has no way of knowing it happened and they won't give you the credit. Deductible business expenses simply aren't accepted without a valid invoice and an invoice with the wrong NIF or issued in a personal name has the same problem.
What happens if you lose an invoice in Portugal?
Let's look at real numbers.
Say your company spends €1,000 on something: a software subscription, a supplier, a piece of equipment. That amount includes €230 in deductible VAT (at the standard rate of 23%).
If you have the invoice, you get that €230 back. If you don't, you lose it. No document, no refund. Those are the VAT deduction rules in Portugal.
Now think about how many deductible company expenses you have per month. Per year. A company spending €3,000/month and missing invoices on even a third of those costs could be losing €2,000–€3,000 a year in VAT alone without realising it.
The real penalty: undocumented expenses under IRC and autonomous taxation
Losing deductible VAT is bad enough. But for companies subject to IRC, missing invoices can trigger something worse.
In Portugal, undocumented expenses, those without a valid invoice, are subject to autonomous taxation at 50% of the expense value under IRC rules. Lose a €500 supplier invoice and that expense doesn't just become non-deductible: your company could owe an extra €250 in autonomous tax on top. That rate can rise to 70% if your company records a tax loss for the year.
That's not a theoretical risk. It's written into the tax code. And it means missing invoices aren't just an admin headache — they're a direct hit to your bottom line.
Why does it keep happening?
This isn't carelessness. These are the real reasons invoices go missing:
Card or bank transactions nobody recognises Someone on the team made a purchase — a subscription, a tool, a one-off expense — and by the time the statement arrives, nobody remembers what it was or where the invoice went. No context, no paper trail, no VAT deduction.
Lost emails The invoice arrived. Nobody found it again. Inboxes are chaos. This is one of the most common reasons company owners end up asking: can I claim VAT without an invoice in Portugal? The answer is almost always no.
Paper invoices that disappear Someone paid in person, tucked the receipt away, and it never made it back to the office. Gone. And with it, any chance of a tax deduction — because you can't deduct business expenses without a receipt in Portugal if you can't prove they happened.
How to recover a missing invoice in Portugal — and stop losing them in the first place
The solution isn't to tell your team to be more organised. (If that worked, you'd already be doing it.)
The solution is to make collecting invoices the path of least resistance — for everyone in the company. That means two things:
1. A clear process Decide upfront: every expense gets a document, same day, no exceptions. Take a photo the moment you pay. Forward supplier emails to a dedicated folder. Don't let it pile up.
If an invoice is already lost, contact the supplier directly — most can issue a duplicate. And there's good news: the deadline to claim VAT on a lost invoice in Portugal is four years from the date of the transaction. That means there's still time to recover old invoices — don't leave that money on the table.
2. A tool that does the heavy lifting This is where Dori Finance fits naturally.
Dori Finance helps you keep track of your invoices without the manual effort. It collects documents from different sources, organises them, and flags anything that's missing.
By keeping everything complete and up to date, it becomes much easier to claim the VAT you're entitled to — and avoid gaps in your records that the tax authority might question.
The goal isn't perfection. It's making sure nothing slips through the cracks — because every invoice you rescue is money your company actually keeps.
Have questions about missing invoices or deductible expenses for your company in Portugal? Talk to us ou try Dori Finance