The VAT credits you are not claiming are the ones you never saw

Every business owner I talk to in Costa Rica knows what IVA is. Far fewer can tell me, with confidence, what proportion of their supplier invoices actually made it into last month's declaration. Those are different questions, and the gap between them is where the money goes.

Here is the mechanism. Input VAT is only creditable against an invoice that reached your accounting records. An invoice that was issued to you, that you paid, and that nobody entered is not a disputed credit or a rejected credit. It is an invisible one. There is no line item showing what you failed to claim, no notice from Hacienda telling you that you overpaid, and no report that flags the absence. You cannot audit a gap you have no record of.

The data already exists in the right form

This is the part that makes manual capture so hard to justify. Costa Rica's electronic invoicing regime means your suppliers are not sending you paper, or a PDF someone has to read. They are sending a structured XML document that Hacienda has already validated. The issuer, the amount, the tax breakdown and the identification numbers are all machine-readable fields.

When somebody keys that into an accounting system by hand, three things happen. The work takes time that scales with your supplier count. Typing errors enter the ledger at the exact point where accuracy matters most. And — the expensive one — capture becomes dependent on a person remembering. Invoices that arrive during a busy week, or while the person who does this is on holiday, do not generate an error. They simply are not there.

A missed credit produces no error message. That is precisely why it persists: every other kind of accounting mistake eventually announces itself, and this one never does.

Why seasonal businesses lose more

The pattern is worse in a business with a high season. Volume arrives exactly when everyone is least able to absorb administrative work, so the months with the most supplier invoices are the months most likely to be captured incompletely. The credits you lose are therefore concentrated in your highest-spend periods rather than spread evenly, which makes the annual total considerably larger than owners expect when they estimate it.

The same applies to any operation running several companies. A hotel with a separate rental company and a holding entity is not one capture process; it is three, each with its own opportunity to miss something, usually managed by the same overstretched person.

What a controlled process looks like

The fix is not working harder at data entry. It is removing the data entry:

• Supplier invoices are pulled directly from their XML rather than retyped, so the record matches what the supplier actually issued.
• Every invoice received in a period is reconciled against what was recorded, so a gap is a visible discrepancy rather than an absence.
• Payments are matched to invoices, which catches the second problem in the same pass — paying something twice.
• The close reports what was captured and what is outstanding, so the question "did we get everything?" has an answer rather than an assumption.

None of that is exotic. It is ordinary process control applied to a document flow that is already digital. The reason it is uncommon is not that it is difficult, but that manual capture never fails loudly enough to force the question.

How to check your own position

You do not need an engagement to find out whether this applies to you. Take a single month, count the supplier invoices you actually received, and compare that to the number recorded in your books for the same period. If those two figures match, your process is sound and this article is not about you. If nobody can produce the first number at all, that is the finding.

I would rather you ran that check yourself and found nothing than take my word for it. The businesses that discover a gap tend to discover a consistent one, and consistency is the useful part: a problem that repeats every month is a problem worth fixing once.