$100,000 in San Francisco vs Madrid: what you actually keep

The computable half

Take a single filer, no children, $100,000 gross in San Francisco, against the currency-equivalent €92,000 in Madrid at roughly mid-2026 rates. Both columns count income tax plus the employee side of social contributions — the money that never reaches the account:

Two things stand out against the stereotype. First, the raw gap is eight points, not the twenty that "Europe taxes everything" folklore implies — and it narrows to two points for a newcomer who qualifies for the Beckham regime. Second, a US paycheck is not lightly taxed: FICA alone takes 7.65% before a single bracket applies, and California's contribution is larger than most Europeans expect. The Spanish and Californian systems are closer relatives than either side likes to admit.

Spanish figures computed with this site's income-tax engine (single, under 65, no children, Madrid). US federal and FICA computed with the same engine's 2026 US module; California state tax is an approximation for a single filer at this income and moves with deductions and credits. Currency conversion is indicative — exchange-rate movement alone can shift these totals by thousands.

The half nobody should compute for you

Now the variable that reverses the table. San Francisco is among the most expensive housing markets on earth; Madrid, despite genuine and painful rent inflation over the last five years, is not in the same category — a one-bedroom in a central Madrid neighbourhood typically costs a fraction of its San Francisco equivalent, and the multiple grows for family-sized homes. Healthcare compounds it: an employer plan's premiums and deductibles in the US versus Spanish public coverage plus optional private insurance at a few dozen euros a month is a difference measured in thousands per year, not hundreds.

Deliberately, this article gives you no cost-of-living index. Those indices average away exactly what determines your outcome — the neighbourhood, whether you have children in school, whether you own a car, whether you fly home three times a year. What holds up is the direction and the rough magnitude: the housing gap between these two cities is larger than the entire tax gap, usually by a wide margin. Check current listings for the two specific neighbourhoods you would actually live in; that number is the real comparison, and it is one you can gather in an afternoon.

The salary question everyone actually asks

Behind this comparison there is almost always a negotiation: "what Madrid offer matches my Bay Area package?" The currency answer, €92,000, is the wrong one — it matches gross pay while ignoring both the tax difference and the cost difference, which point in opposite directions. Matching purchasing power after housing, Madrid salaries well below the conversion are frequently comparable, which is why European offers that look like pay cuts on paper often are not in practice.

Two adjustments belong in that negotiation and rarely make it. Equity: if your Bay Area package is significantly RSU-weighted, the comparison is not salary-to-salary at all, and the Beckham regime's treatment of vests and foreign gains can be worth more than the base-pay difference. And time horizon: Beckham expires after six years, so a package that works brilliantly at year one meets full progressive rates in year seven — plan the arc, not the first payslip.

The analysis

The interesting finding here is not that Madrid taxes more — it is how little more, and how completely that difference is swamped by everything else. Eight percentage points separate the two systems on identical gross pay; a single rent cheque separates the two cities by considerably more, in the other direction. The tax conversation, which absorbs most of the online debate, turns out to be the smaller half of the decision.

That has a practical implication worth taking seriously. If you are optimising a move for money, the levers that matter are, in order: the city and neighbourhood you choose, whether your income qualifies for the six-year regime, and only then the marginal rates that dominate the forums. And if you are not optimising for money — which is most people making this particular move — the honest conclusion is that the tax difference is small enough to be a footnote to the reasons you were actually considering it. Run your own numbers in the calculator; the arithmetic is the easy part.