Explanations
Understand the rule behind the result.
The calculators are deliberately short. These guides explain the assumptions, edge cases and source hierarchy in more depth.
How special expat tax regimes differSalary thresholds, prior residence, duration, employer conditions and why headline tax rates mislead.
Denmark researcher & highly paid employee scheme2026 threshold, rate, prior-tax rule and seven-year limit.
Netherlands Expat Scheme / 30% facility2026 salary standards, recruitment-from-abroad and 150 km rule.
Schengen 90/180 rule explainedWhy it rolls, how entry and exit days count, and what is excluded.
Permanent residence vs citizenshipWhy the timelines overlap but are not interchangeable.
How ExpatEngine handles rule changesVerification dates, source hierarchy and why we sometimes show “unknown”.