How we check that Tributo's numbers are correct
Tributo's promise is to never invent a figure. In plain words, here's how we verify that the information we show you is correct for any combination of answers.
When an app tells you “you owe this, on this day”, the fair question is: how do I know it's right? In taxes, one wrong detail can change the number. Our promise is simple: we don't invent figures. But a promise isn't enough — you have to prove it. Here's how we did it, without the jargon.
The problem
In onboarding you answer a few questions: what you do, whether you export, whether you have a spouse or children, when you started, how much you invoice. Each combination leads to a different result: a régime, a set of obligations, amounts and dates. There are a huge number of combinations. Testing “a few by hand” isn't enough to be sure.
What we did
We wrote an automated test that runs through every combination of answers that changes the result, checking each case with exactly the same engine the app uses. If any case produced a wrong number or régime, the test fails and tells us.
How we verify it without cheating
The trick is not to compare the app with itself — that would prove nothing. For each case we compute the expected result separately, from the verified official figures (DGI and BPS) using the published formulas. Only then do we compare what the app produces against that independent calculation. If they differ, there's a bug — and we find it.
Three things we check in every case
- That you're routed to the right régime — and that, when your case is outside what we've verified, it says so clearly instead of guessing.
- That the amounts match the official figures (contributions, FONASA, IRAE, the Monotributo fee…).
- That no case is left unchecked: every régime, every family situation and every bracket is covered.
The result
We checked hundreds of combinations and found no calculation errors: in every case the app matches the independent calculation built from the official sources. The process also made us pin down a couple of subtle-but-correct details (for example, that some amounts change within the same year when an activity anniversary is crossed). And because the test keeps running, it protects us from future mistakes: if something breaks, we know before it reaches you.
Why it matters to you
Because it means that when Tributo shows you a number, it's the one that comes from the official rules — not a made-up estimate. And when we can't be sure about your case, we tell you honestly, instead of handing you a doubtful figure. That, to us, is the only way to earn your trust. Want to see your calendar? Try Tributo.