Why do missing VAT invoices only surface after the deadline to fix them?
Quarter ends. The accountant pulls out a stack of delivery notes and starts matching them against what she has. Some VAT invoices never showed up. She finds the gap, and by then the window to fix it has already closed.
It looks like a one-off, but it isn't. It happens again next quarter.
Why it keeps happening
Nobody did anything wrong. The problem is that nobody's job is to look at it every day. Delivery notes arrive, invoices are supposed to follow, and the comparison between the two happens only when someone sits down to close the period.
That is the whole mechanism. The gap exists from the day the delivery note lands without a matching invoice. But it is found weeks later, at quarter end, because that is the first moment anyone has a reason to check. By then the accountant is doing archaeology: digging through old paperwork to reconstruct what should have happened.
What changes when the check is daily
The fix is about timing, not about a smarter search. The platform flags the mismatch the day the delivery note lands. The accountant doesn't need to excavate, because the problem shows up while it is still small and the missing invoice can still be chased.
The pipe metaphor fits. A leak is cheap to deal with while the pipe is accessible. Once it is behind the wall, you are tearing things open. The quarter-end close is the wall.
Nothing about the work itself is clever. It is the same comparison the accountant was already doing by hand, moved from the end of the period to the moment the data arrives.
What this does and doesn't cover
The flag is tied to the delivery note landing. It tells you there is a mismatch. It does not produce the missing invoice. Someone still has to ask the supplier for it, and that part stays manual.
It also starts from the delivery note. If a delivery note never reaches the system, there is nothing to compare, so there is nothing to flag.
What to check in your own process
- When does your team first compare delivery notes with VAT invoices: on arrival, or at period close?
- Whose job is it to look at the gaps between those closes? If the honest answer is "nobody's", the problem will recur.
- When a gap is found, is there still time to fix it, or has the window already shut?
If the answers point to quarter end, you have the same setup as the accountant in the story. The problem is completely preventable, and the fix is a boring one: look earlier. That is usually the best kind.