How to compare an expat tax offerA special tax regime can make an employment offer look dramatically better, but the headline percentage is only one part of the comparison.How special expat tax regimes workCountries use special inbound tax regimes to attract researchers, executives, skilled workers, investors or new residents. The mechanism varies widely.Currency conversion for expat comparisonsConvert both salary and eligibility thresholds into a common reference currency, but keep the original legal currency visible because exchange rates move and statutory thresholds do not move with them.Understanding the Schengen 90/180 ruleFor short stays covered by the common Schengen rule, you look backwards 180 days from each day of presence and count the days spent in the Schengen Area. Entry and exit days both count.Permanent residence vs citizenshipPermanent residence or settlement usually gives a stronger right to stay without becoming a national.How to use changing immigration and tax rulesTax thresholds, immigration residence periods and programme names change. ExpatEngine stores rules as structured facts tied to a period and source rather than treating one article as permanently correct.How to compare two relocation offersCompare guaranteed cash, tax, social contributions, housing, pension, equity, relocation support, healthcare and the value of any time-limited tax concession—not just gross salary.Gross salary vs net salary when relocatingGross salary is only a starting point. Two countries can tax the same gross amount differently because of progressive rates, social insurance, municipal charges, deductions, compulsory pension systems and family rules.What happens when an expat tax concession expires?A time-limited tax regime should be modelled from the end backwards, not only from the attractive first year. When the concession expires, ordinary income-tax rates, deductions and reporting rules generally take over.Relocation tax questions to ask before signing an employment contractThe best time to clarify a special tax regime is before the employment contract and relocation dates become fixed.