Key takeaways
- Every Heavnn University tax guide is researched from official sources first – tax authorities, official gazettes and the law itself – and checked line by line before it goes live.
- Each guide is reviewed by Stéphane Gombauld, a tax expert, technologist and digital nomad, and shows the date it was last reviewed.
- Rules change, so guides are re-checked regularly, and if you spot something wrong or outdated you can tell us and we will correct it.
Last updated: November 2026
Tax rules decide where you live, how much you keep and what happens when you move. So a guide that is out of date or wrong isn't just annoying – it can cost you real money. This page explains, in plain words, how we research, check and keep our guides up to date, and who is behind them.
Who reviews our guides?
All country tax guides on Heavnn University are reviewed by Stéphane Gombauld – tax expert, technologist and digital nomad.
Stéphane is a tax advisor who studied at Université Paris 1 Panthéon-Sorbonne. He combines tax expertise with technology, and lives and works as a digital nomad himself, with Tallinn as his base. That's why our guides focus on the questions location-independent people actually face: where am I tax resident, what happens to my company when I move, and how do I stay compliant in more than one country at once?
Transparency note: Stéphane is also the founder of Heavnn, the company that publishes Heavnn University and offers tax-compliance services to location-independent professionals. Our guides link to Heavnn's tools because many readers want help with their own situation. Our aim is for every guide to explain the rules accurately and usefully whether or not you ever use Heavnn.
Where does our information come from?
We use a strict order of sources. A fact only goes into a guide if it can be traced back to the highest level available:
- The law itself – tax codes, finance acts and official gazettes.
- Tax authorities – guidance, forms and rate tables published by the country's tax administration.
- Official international sources – OECD, EU and double tax treaty texts.
- Recognised professional summaries (Big Four tax summaries, for example) – used to cross-check, never as the only source.
Every guide ends with a Sources section listing the official links we relied on, so you can check them yourself.
How is a guide written and checked?
- Research brief. We list what people actually search for on the topic and every figure the guide needs: rates, thresholds, day counts, deadlines.
- Source check. Each figure is verified against the official source for the current tax year. Anything we cannot confirm is left out rather than guessed.
- Writing in plain English. We explain the rule, then show it in a worked example with real numbers, then flag the traps.
- Expert review. Stéphane reviews the guide for accuracy and real-world relevance before publication.
- Final quality check. Links, dates, figures and formatting are checked one last time on the live page.
We use software tools, including AI-assisted research and drafting tools, to work faster. They never publish anything on their own: every figure is checked against an official source and every guide is reviewed by a human expert.
How do we keep guides up to date?
- Visible review date. Each guide shows when it was last reviewed.
- Annual review. Every priority country is reviewed at least once a year, usually after the January changes and each national budget.
- Change monitoring. We monitor tax authorities and finance-law news in our priority countries every month and update the guides affected.
How do we handle mistakes?
If you think something is wrong or out of date, contact us. We check the official source, correct the guide if needed and update its review date.
What our guides are – and what they aren't
Our guides explain how tax rules work in general, with examples. They are not personalised tax or legal advice: your situation depends on details – your days, your family, your income, your company – that a general guide cannot see. If you want your own situation checked, that's exactly what Heavnn is for.
Frequently asked questions
Who writes the Heavnn University tax guides?
The guides are researched and written by the Heavnn editorial team and reviewed by Stéphane Gombauld, a tax expert, technologist and digital nomad. Every guide is checked against official sources such as tax authorities, official gazettes and tax treaties before it is published.
How often are the tax guides updated?
Each guide shows its last review date. Priority countries are reviewed at least once a year, after January changes and national budgets, and we monitor official sources every month to update guides when the rules change.
Can I rely on these guides for my own tax decisions?
They give you a reliable picture of the rules and the questions to ask, but they are general information, not personalised advice. Your residence, income and company details can change the answer, so have your own situation checked before acting.
How do I report an error in a guide?
Use our contact page and tell us which guide and which point. We check the official source, correct the guide if needed and update its review date.
Who is behind Heavnn University?
Heavnn University is published by Heavnn, a company that helps location-independent professionals stay tax compliant across countries. Its guides are reviewed by Stéphane Gombauld, Heavnn's founder, and link to Heavnn's tools for readers who want their own situation checked.
This page describes our editorial process. Our guides are general information, not personalised tax advice.
