The first tax return — Seville

You thought leaving the UK meant leaving HMRC. You did not. The moment you spend more than 183 days in Spain in a calendar year, you become a Spanish tax resident — and that status does not cancel your UK obligations, it layers on top of them. Seville adds its own texture to this: it sits in Andalusia, which has its own regional tax rates and allowances that differ from Madrid or Catalonia, and the city's growing international population means the local gestoría market has expanded, but quality varies considerably. This article is for UK nationals who have moved to Seville, are planning to, or have recently crossed the residency threshold and are now staring at two tax systems simultaneously. If you assumed the paperwork ended when you handed back your Oyster card, read on.

What the first tax return actually looks like in Seville

The Spanish system you are entering and what it demands from day one

Spain's personal income tax is called the Impuesto sobre la Renta de las Personas Físicas, or IRPF. Once you are a Spanish tax resident, you are taxed on your worldwide income — not just what you earn in Spain. That means your UK rental income, dividends, pension drawdowns, and freelance earnings all fall within the Spanish tax net. The Spanish tax year runs January to December, and the annual return — the Declaración de la Renta — is filed between April and June of the following year. Miss that window and you face automatic surcharges.

Andalusia, the autonomous community that governs Seville, sets its own regional income tax rates on top of the national base rate. The combined effect is a progressive system where rates rise from around 19% at the lower end to over 47% at higher income levels (Source: Agencia Tributaria, 2026). Andalusia has historically offered some of the more competitive regional rates in Spain, including a reduced inheritance and gift tax regime, which matters if you are transferring assets as part of your relocation.

How Seville's Agencia Tributaria office fits into your filing process

The Agencia Tributaria — Spain's equivalent of HMRC — has a Seville office on Calle Álvarez Quintero in the Casco Antiguo district. You can book appointments online, but during the April-to-June filing season, slots fill weeks in advance. Many Seville residents use a gestoría or asesor fiscal rather than attending in person, which is the more practical route if your tax situation involves UK income sources.

Your first return will almost certainly be more complex than subsequent ones, because it covers the year in which you transitioned from UK to Spanish residency. You may be a UK tax resident for part of that year and a Spanish tax resident for the rest, which requires careful handling of the split-year treatment provisions under the UK-Spain Double Taxation Convention (Source: HMRC, 2026). Getting this transition year wrong is the most common and most expensive mistake UK arrivals make.

What surprises people

The Andalusian regional layer that most online guides ignore

Most articles about Spanish tax talk about national IRPF rates and leave it there. What they omit is that Andalusia applies its own regional tranche on top, and that the combined rate is what you actually pay. The good news is that Andalusia has progressively reduced its regional rates over recent years and abolished its regional wealth tax — a decision that makes Seville materially more attractive than some other Spanish regions for higher-income residents (Source: Junta de Andalucía, 2026). If you have been comparing tax rates across Spanish cities, Seville's Andalusian context is worth factoring in explicitly.

The UK pension trap that catches Seville retirees off guard

Seville has a significant and growing retiree population, many of whom arrive with UK state pensions, private pensions, or drawdown arrangements. The UK-Spain Double Taxation Convention allocates taxing rights on UK government pensions — including civil service and NHS pensions — to the UK, meaning those specific pension types remain UK-taxable even after you become a Spanish resident (Source: HMRC, 2026). Private pensions and state pension income, however, are taxable in Spain once you are resident. The practical result is that many Seville retirees find themselves filing in both countries simultaneously, not because of an error, but because the treaty requires it. This is not a problem that resolves itself — it requires active management from the first year.

The numbers

Seville cost and property benchmarks relevant to tax planning

The rental yield figures carry direct tax implications that the table cannot show. If you are earning 4% to 6% gross on a Seville property, the net yield after Spanish rental income tax — which is levied at 19% for EU residents on net rental income — will be meaningfully lower (Source: Agencia Tributaria, 2026). The cost differential versus London is relevant because it affects how far a UK-sourced income or pension stretches, but it does not reduce your tax liability — Spain taxes on income, not on what you spend. The city average of €2,100 per square metre also matters if you are considering purchasing: capital gains on Spanish property are taxed separately from income, at rates between 19% and 28% depending on the gain (Source: Agencia Tributaria, 2026).

What people get wrong

Assuming the Double Taxation Convention means paying tax nowhere

The UK-Spain Double Taxation Convention exists to prevent you being taxed twice on the same income — not to create gaps where income escapes tax entirely. A significant number of UK nationals arriving in Seville assume that because they have left the UK, their UK income is no longer HMRC's concern. That is incorrect. UK rental income, for example, remains reportable to HMRC even after you become a Spanish resident, and Spain also expects you to declare it. The convention then determines which country has primary taxing rights and provides a credit mechanism — but both countries still want to know about it (Source: HMRC, 2026).

Treating the Modelo 720 as optional paperwork

The Modelo 720 is Spain's overseas asset declaration, requiring Spanish tax residents to report foreign assets — including UK bank accounts, property, and investment portfolios — above €50,000 per asset category (Source: Agencia Tributaria, 2026). Many UK arrivals in Seville either do not know it exists or assume it applies to wealthy investors rather than ordinary professionals. It does not. A UK property worth more than €50,000, a UK pension pot, or a UK investment ISA can all trigger the obligation. The penalties for non-filing were historically severe, and while the European Court of Justice has moderated some of the more disproportionate elements, the obligation itself remains. File it. The deadline is 31 March following the tax year in which you became resident.

Waiting until April to find a gestoría in Seville

Seville has a growing number of English-speaking gestorías and asesores fiscales, particularly in Nervión and the Casco Antiguo, but the good ones are fully booked by February each year as the Declaración de la Renta season approaches (Source: RelocateIQ research). UK nationals who arrive in autumn, settle in, and then start looking for a tax advisor in March routinely find themselves either working with someone who does not understand UK-Spain cross-border situations or filing late. The advisors who genuinely understand both systems — HMRC's self-assessment and Spain's IRPF simultaneously — are a smaller subset still.

What to actually do

Start the tax relationship before you file anything

The single most useful thing you can do in your first months in Seville is find a cross-border tax advisor before you need one urgently. Ask in the Seville expat Facebook groups and WhatsApp communities — the ones with active UK membership will have recommendations, and the names that come up repeatedly are worth pursuing. Look specifically for an asesor fiscal or gestoría that explicitly lists UK-Spain double taxation as a specialism, not just general expat tax. Nervión has several established practices; the Casco Antiguo has more, though quality varies.

Once you have someone, give them your full picture: UK property, pensions, investments, employment structure, and the date you arrived in Spain. The transition year is the one that requires the most careful handling, and the earlier they understand your situation, the better they can structure your first Declaración de la Renta.

Get the sequencing right before worrying about optimisation

Before you think about the Beckham Law, Andalusian allowances, or rental income structuring, make sure the foundations are in place. Register on the Padrón Municipal at your local Ayuntamiento — this establishes your official Seville address and is the document your gestoría will need. Obtain your NIE if you have not already. Notify HMRC of your departure using the P85 form and confirm your UK tax residency status for the transition year.

Then, and only then, start the conversation about optimisation. Andalusia's regional allowances, the Beckham Law eligibility window, and the treatment of your UK pension all have planning opportunities — but they require a clean foundation to work from. Seville's administrative pace is what it is; build the timeline accordingly and do not expect anything to move faster than the system allows.

Frequently asked questions

When do I become a Spanish tax resident?

You become a Spanish tax resident if you spend more than 183 days in Spain during a calendar year, or if your primary economic interests are based in Spain (Source: Agencia Tributaria, 2026). The 183-day count applies to the calendar year — January to December — so arriving in Seville in July means you could cross the threshold before the year ends.

In practice, Seville's Agencia Tributaria uses the Padrón Municipal registration date as a supporting indicator of residency, though it is not the sole determinant. Your economic ties — where your income is generated, where your assets are held — also factor in.

The practical takeaway is to track your days carefully in the year you move, and take advice on whether you are better positioned as a Spanish resident from the date of arrival or from the following January, depending on your income profile.

What is the Beckham Law and do I qualify?

The Beckham Law — formally the Régimen Especial para Trabajadores Desplazados — allows qualifying individuals to pay a flat 24% tax rate on Spanish-sourced income up to €600,000, rather than the standard progressive IRPF rates, for up to six years (Source: Agencia Tributaria, 2026). It was reformed in 2023 to extend eligibility to remote workers and digital nomads, not just company-transferred employees.

To qualify in Seville, you must not have been a Spanish tax resident in the five years prior to your arrival, and you must be working under a Spanish employment contract, running a qualifying business activity, or working remotely for a non-Spanish employer. The application — Modelo 149 — must be filed within six months of starting work in Spain.

Not everyone benefits. If your income is modest or if you have significant non-Spanish income sources, the standard IRPF regime with its allowances and deductions may produce a lower bill. Run the numbers with your asesor fiscal before assuming Beckham is the right choice.

Do I still have to file a UK tax return if I live in Seville?

Whether you need to file a UK Self Assessment return after moving to Seville depends on whether you have UK-source income — rental income, dividends, pension payments, or freelance earnings from UK clients (Source: HMRC, 2026). Leaving the UK does not automatically end your UK filing obligation if those income streams continue.

You should submit a P85 to HMRC to formally notify them of your departure and establish your non-resident status for UK tax purposes. HMRC will then assess whether ongoing Self Assessment filing is required based on your remaining UK income.

If you retain a UK rental property — which many Seville arrivals do — you will almost certainly need to continue filing UK returns under the Non-Resident Landlord Scheme, while also declaring that same income in Spain. Your Seville-based asesor fiscal and your UK accountant need to be coordinating, not working in isolation.

What is the Modelo 720 and who needs to file it?

The Modelo 720 is Spain's mandatory declaration of overseas assets for Spanish tax residents who hold foreign assets exceeding €50,000 in any of three categories: bank accounts, investments and securities, and real estate (Source: Agencia Tributaria, 2026). If you have a UK property, a UK pension, or a UK investment portfolio above that threshold, you are likely required to file.

The deadline is 31 March of the year following the one in which you became a Spanish tax resident. Miss it and you face penalties, even if the assets themselves are entirely legitimate and tax-compliant.

For Seville residents with UK property — a common situation given how many arrivals retain a home in the UK — the Modelo 720 is not optional and not obscure. It is a standard part of your first-year tax obligations and should be on your gestoría's checklist from day one.

How much income tax will I pay in Spain?

Spanish IRPF is a progressive tax combining a national rate and an Andalusian regional rate. The combined rates in Andalusia run from approximately 19% on the lowest income band to over 47% on income above €300,000 (Source: Agencia Tributaria, 2026). Andalusia has reduced its regional rates in recent years, making it one of the more competitive autonomous communities for income tax purposes.

The rate you actually pay depends on your total worldwide income as a Spanish resident, the deductions and allowances you can claim, and whether you are on the standard IRPF regime or the Beckham Law flat rate. A mid-range remote worker earning €50,000 will face a materially different effective rate than a retiree drawing a UK pension of the same amount, because the income composition and applicable allowances differ.

The only reliable way to know your number is to model it with a qualified asesor fiscal using your actual income sources. Headline rates are a starting point, not a forecast.

How do I find a good English-speaking tax advisor in Seville?

Seville has a growing number of gestorías and asesores fiscales with English-language capability, concentrated in Nervión and the Casco Antiguo (Source: RelocateIQ research). The critical distinction is between advisors who speak English and advisors who genuinely understand UK-Spain cross-border tax — the two are not the same thing.

Ask for recommendations in established Seville expat communities — the Facebook groups and WhatsApp networks with active UK membership are the most reliable filter, because the names that appear repeatedly have been tested by people in your exact situation. Verify that any advisor you approach has specific experience with HMRC Self Assessment, the UK-Spain Double Taxation Convention, and the Modelo 720.

Book early. The advisors who are genuinely good at this are fully committed by February each year, and trying to find someone competent in March — when the Declaración de la Renta season is already underway — is a reliable way to end up with someone who is not the right fit.

Can I be taxed in both the UK and Spain simultaneously?

Yes, and for many UK nationals in Seville, this is not an error — it is the correct outcome under the UK-Spain Double Taxation Convention (Source: HMRC, 2026). The convention allocates taxing rights on different income types between the two countries, and some income — particularly UK government and civil service pensions — remains UK-taxable even after you become a Spanish resident.

The convention prevents double taxation through a credit mechanism: where Spain has primary taxing rights, you can offset UK tax already paid against your Spanish liability, and vice versa. But both countries still require you to declare the relevant income, and both tax authorities expect to see the returns.

The practical implication for Seville residents is that you may need both a UK accountant and a Spanish asesor fiscal working in parallel, particularly in the first two or three years after your move. This is a cost worth treating as a fixed part of your relocation budget rather than an unwelcome surprise.

What are the tax implications of renting out my UK property while living in Seville?

Retaining and renting a UK property while living in Seville creates obligations in both countries. In the UK, rental income from a UK property is taxable in the UK under the Non-Resident Landlord Scheme, and you will need to continue filing UK Self Assessment returns (Source: HMRC, 2026). In Spain, the same rental income must be declared as part of your worldwide income on your Declaración de la Renta.

The UK-Spain Double Taxation Convention means you will not pay full tax twice on the same income — the Spanish system provides a credit for UK tax already paid. However, if the Spanish tax liability on that income exceeds what you paid in the UK, you pay the difference to Spain.

There are also Modelo 720 implications: if your UK property exceeds €50,000 in value — which most UK properties do — it must be declared annually as a foreign real estate asset (Source: Agencia Tributaria, 2026). Get both your UK accountant and your Seville gestoría aligned on this from the outset, because the interaction between the two systems requires active coordination, not two separate advisors working independently.