# Absence is information

A knowledge base that only records what exists misleads by omission. Why getax records the taxes a country does not levy as facts in their own right, and why a gap it cannot yet fill is shown rather than hidden.

3 September 2026 · Carol Ireland · 3 min read

![A grid of navy and teal tiles with one empty, amber-outlined tile under a magnifying glass.](https://www.getax.io/blog/images/BI-swoakSJcAJd6iFZk)

Ask a database whether a country has a wealth tax and it will tell you what it holds. If it holds nothing, the answer looks the same whether the country has no such tax or the database simply never got round to it. For a client planning a move, those are opposite answers.

getax treats the difference as a first-class fact. A tax a country does not levy is recorded, cited and reviewed like any other fact, and a category the system has not yet covered is shown as a gap with a reason, never as a blank that could pass for an answer.

## A documented absence is a fact

Several jurisdictions have no net wealth tax. Some have abolished inheritance tax. A report that stays silent on the point has failed the client, and a report that asserts the absence without evidence has done something worse. So the knowledge base records the absence as a fact in its own right, anchored to the authority’s own catalogue of the taxes it administers, and marks how it was established so that provenance never mistakes it for an extracted rate.

An absence established that way is a high-certainty answer, the kind an in-country expert would give without hesitation. It counts toward a country’s coverage on the same footing as a positive fact, because to the client it is one.

## A gap is shown, not hidden

The other side of the rule is harder to keep. Some official sources are behind walls the system cannot pass, some categories have no tier-one text yet, and some countries are simply not far enough along. The easy thing is to quietly leave those rows out. getax does the opposite: the coverage view lists every country, and a category that is not covered says so and says why.

That is also how coverage is measured. A country is mature when each of the core categories a cross-border position turns on has at least one validated fact, not when the total number of facts is large. Hundreds of facts clustered in a few categories leave a client no better served than a dozen spread across the ones that matter. Working the missing categories, rather than the count, is the whole discipline.

## What the reader sees

In a report, a documented absence reads as a plain sentence with a citation to the authority’s catalogue, so the reviewer can confirm it the same way they confirm a rate. A gap reads as a named unknown, listed with the position’s other unknowns, so nobody mistakes silence for clearance.

> A missing tax is an answer. A missing fact is a question. A report has to make clear which one it is giving you.

The [sample report](/sample-report) lists its unknowns alongside its findings, which is where an honest position keeps them.