The mistake people make is thinking "tax" is one number — or that the headline income-tax rate decides everything. It isn’t. What actually matters is where your different income streams are sourced, whether you trigger tax residency, regional (autonomous) rates in Spain, Portugal’s special regimes, and the messy bits that arrive two years after you move: wealth tax assessments, inheritance rules and declarations of foreign assets.
Quick comparison
| Criterion | Spain (short) | Portugal (short) |
|---|---|---|
| Basic rule on pensions | Taxed as ordinary income (IRPF) at progressive national + regional rates; rates vary by region. | Foreign pensions can be advantaged by the Non‑Habitual Resident (NHR) regime; rules changed in recent years—some pensions taxed at flat rates for qualifying residents. |
| Top income tax rate (residents, 2026) | Roughly 45–50% top combined (national + regional) in higher brackets — check regional bands. | Under NHR or ordinary rules, effective rates on pensions can be lower; ordinary top rate c.48% (check current bands). |
| Special non‑resident/pension scheme | No special NHR; non‑residents taxed 24% on Spanish‑source income. | NHR (10 years) historically attractive; details and eligibility matter—some benefits changed since 2020. |
| Wealth tax | Applies with regional variation and exemptions; many Spanish regions reduce or abolish but other regions keep it. | No general wealth tax (annual), but there are municipal property taxes and stamp duties; wealth tax abolished in most cases (but verify). |
| Property tax & running costs | IBI plus trash, plus possible wealthy-region surcharges (plus higher property transfer taxes on purchase 8–11%). | Municipal IMI (property tax) often lower; purchase taxes and stamp duties vary; purchase costs typically lower in many areas. |
| Inheritance & gift tax | Highly regionalised; some regions offer low rates for spouses/children, others tax more heavily. | Progressive inheritance tax; exemptions and rates different from Spain — legal planning helps. |
| Reporting traps | Modelo 720 — strict rules and heavy fines for undeclared foreign assets. | Foreign asset reporting required but less draconian; still must follow rules and deadlines. |
| Double taxation | Treaties with US/UK/Canada alter where pensions are taxed — check specific treaty. | Also covered by double tax treaties; Portugal often negotiates credit/relief differently; check your home country treaty. |
How pension income is taxed — the core decision
Start here. For most retirees, the largest single income stream is a state pension, a workplace pension and any withdrawals from retirement accounts. Spain treats pensions as ordinary income: you add them to other income and pay IRPF (Impuesto sobre la Renta de las Personas Físicas). That means progressive rates, national plus autonomous‑community layers. In practice the top marginal can reach the mid‑40s to around 50% in a few regions once you include surtaxes, so a large pension can be substantially reduced.
Portugal’s headline advantage for many years was the Non‑Habitual Resident (NHR) regime. It still exists and can be useful, but the details have changed and you must qualify carefully. Under NHR certain foreign‑source pensions and incomes may be taxed at favourable flat rates or even exempt if a double‑tax treaty assigns taxing rights to the country of origin. From 2020 onward, many foreign pensions falling into the NHR régime have been taxed at a flat rate (often quoted as 10%) in new entries, so check the current legal text for exact treatment as of the year you move.
Practical takeaway: if most of your income is foreign pensions or investment income, Portugal's NHR can be the better fit, but only if you qualify and your home country treaty doesn't force a different outcome. If you have Spanish‑source pensions or large Spanish rental income, Spain will tax those aggressively.
Wealth, property and ongoing charges — what hits your nest egg
Taxes that nibble at the capital — not just the cashflow — matter more as you age. Spain has an annual wealth tax that applies above regional thresholds; autonomous communities have discretion to raise, lower or abolish their own rates and exemptions. In some regions (for example, Madrid) there are large exemptions or reductions; in others the wealth tax bites. Expect to see assessments, declarations and occasional regionally applied surcharges.
Portugal does not generally have an equivalent annual national wealth tax on worldwide assets in the same way Spain does; instead there are municipal property taxes (IMI) and stamp duties. That makes Portugal simpler if you have a large portfolio and want to avoid repeated annual wealth assessments. But remember: property running costs (IMI, condominium fees) and the one‑off purchase taxes vary. In many parts of Portugal you’ll pay lower IMI than IBI in Spain, and transfer taxes on purchase are often lower — which affects the buy vs rent calculation.
Example: a €1m net worth made up largely of foreign investments will trigger Spain’s wealth assessments in many regions; in Portugal you’re more likely to face only regular income‑tax questions and municipal property taxes.
Inheritance and gift tax, the surprise bill families face
This is where the story turns local. Spain’s inheritance tax is extremely regionalised. In Madrid and a handful of regions close relatives face mild or zero charges; in others the exemption and the rate structure are less generous. Portugal’s inheritance rules have their own scale and exemptions. The crux: cross‑border estates get complicated fast. Which country’s law governs the asset? Where do the heirs live? Does the family home sit in Spain and the children live in the UK?
Practical step: get a simple seat‑of‑assets map before you move. If your property, bank accounts and heirs are in different countries, ask a lawyer about an EU succession certificate and using wills in both countries. Families often recover from a bad start by negotiating a settlement with local authorities and amending wills, but that’s slower and costlier than planning ahead.
Double taxation treaties, social security and US/UK/Canada specifics
Treaties change the rules. For Americans, the US‑Spain treaty assigns taxing rights over some pensions differently to the domestic rule: that can mean Social Security is taxed in the US but not in Spain, or vice versa — depends on the specific pension type. For UK citizens, the UK‑Spain treaty and UK‑Portugal connections also matter: some state pensions are taxable only in the home country. Read the treaty that matters to you and use it when you file.
We have dedicated guides to the US and UK treaties that explain the usual outcomes and paperwork: see our double taxation discussions for the US and UK. Those pages show you the specific articles and the practical claims you’ll make on tax returns.
Trap: Modelo 720 and undeclared foreign assets
If you become a Spanish tax resident and have bank accounts, securities or property outside Spain, you must file Modelo 720 to declare them. Missing it, or declaring late, can trigger fines that are disproportionate to the undeclared amounts. It’s not hypothetical: retirees who moved, kept safe accounts in their home country and forgot the form discovered heavy penalties. If you’re considering Spain and you hold overseas assets, plan this first: talk to a gestor before you register.