UK inheritance tax in Spain can affect British expats even after moving abroad. Learn how the 10-year rule, Spanish succession tax and unilateral relief can interact.

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For years the Modelo 720 foreign-asset declaration was feared for penalties so severe they were eventually ruled unlawful by Europe's top court. Many British expats still carry that fear and freeze when they realise they filed late, filed wrong, or never filed at all. This article explains what actually changed after 2022, what the penalties look like now, and how a voluntary correction usually turns a frightening problem into a manageable one.
Most British expats who realise they filed their Modelo 720 late, filed it wrong, or never filed it at all assume they are facing financial ruin, because they are:
In practice, that feels reasonable. It is also where the gap starts.
The penalties that made Modelo 720 notorious no longer exist. They were struck down, and what replaced them is far milder. The real risk today is not the penalty. It is the paralysis that stops people fixing a small problem while it is still small.
This article exists to explain what changed after 2022, what a correction actually costs now, and how British expats in Spain put a late or incorrect declaration right without the outcome they are dreading.
Modelo 720 is an informative declaration. Spanish tax residents use it to tell Hacienda about assets they hold outside Spain. It is not a tax in itself. Nothing is charged simply for owning foreign assets and reporting them.
That single fact is worth holding on to, because much of the fear around the form assumes it triggers a tax bill. In the vast majority of cases it does not. It is a disclosure exercise, and the information it captures often overlaps with figures you already know from declaring your worldwide position each spring on the ordinary income tax return.
You are within scope if you are tax resident in Spain and your foreign assets in any reporting category exceed the threshold. Residency here follows the usual Spanish rules, which means the whole calendar year decides whether you are resident, with no split-year treatment. If you became resident during a year, you are treated as resident for all of it.
Non-residents do not file Modelo 720. Neither do residents whose foreign assets stay below the thresholds in every category. So the first question is never how to file, it is whether you had an obligation at all.
Modelo 720 splits foreign assets into three separate categories, and each is tested on its own.
A category becomes reportable when the total value in that category exceeds EUR 50,000 at the end of the year. The categories do not combine. EUR 40,000 in foreign accounts and EUR 40,000 in foreign investments is EUR 80,000 in total, but neither category crosses EUR 50,000, so on that basis there is nothing to report.
Once you have filed for a category, you do not file again every year automatically. You file again for that category only when its value rises by more than EUR 20,000 above the last figure you reported, or when you close or dispose of a reported asset. This is where errors creep in, because people either forget the EUR 20,000 rule or file needlessly when nothing has changed enough to require it.
Understanding which category tripped, and when, is usually the key to working out whether a correction is even necessary, and if so, for which year.
A practical example makes the EUR 20,000 rule concrete. Suppose you first reported foreign accounts at EUR 60,000. If they later sit at EUR 72,000, that is a rise of EUR 12,000, below the EUR 20,000 trigger, so no fresh filing is required for that category on that basis. If instead they reach EUR 85,000, the rise of EUR 25,000 crosses the line and a new declaration is due. Many so-called errors turn out, on inspection, to be years where nothing needed filing at all, which is why checking the obligation carefully often shrinks the problem before any correction is even made.
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The old regime was genuinely severe. Late or missing declarations could be treated as unjustified capital gains, taxed as if the assets were undeclared income, with a surcharge of 150% on top, and with no effective time limit. In some cases the combined charge could exceed the value of the assets themselves.
In January 2022 the Court of Justice of the European Union, in case C-788/19, ruled that this regime breached EU law. It found the penalties disproportionate and the absence of any time limit incompatible with the free movement of capital.
Spain responded with Law 5/2022, which removed the special penalty regime altogether. The obligation to file Modelo 720 remains, but the punishment for getting it wrong now comes from the ordinary rules that apply to any other informative declaration.
This is the single most important thing for a worried expat to absorb. The framework that generated the frightening headlines was abolished. The form still exists, but its teeth were removed.
It is worth being clear about what did not change. The obligation to disclose foreign assets is still there, and Hacienda still receives information about accounts held abroad through automatic exchange between tax authorities. So the answer to a past failure is never to hope it stays hidden. What changed is the consequence of putting it right, which moved from potentially ruinous to ordinary and proportionate. That shift is precisely what makes voluntary correction the sensible route rather than a frightening one.
Modelo 720 now sits under the General Tax Law penalty regime, the same framework that governs ordinary reporting failures in Spain. Two ideas do most of the work.
The fine is per category, not per asset, and the lower end applies to more modest or voluntary corrections. A single overlooked UK savings account is not treated the same as a deliberate concealment of a large portfolio.
Crucially, because Modelo 720 is informational, in many corrections there is no underlying tax at all. Where there is no tax to pay, there is no surcharge to calculate, and the exposure is limited to the fixed fine, which is itself reduced when you come forward voluntarily. The distance between this and the old 150% surcharge is enormous.
It is worth thinking of the new position in proportion. A fixed fine measured in a few hundred to a few thousand euros for a modest, voluntarily corrected omission is a different order of magnitude from a charge that once threatened to exceed the value of the assets themselves. For most British expats the practical exposure sits at the mild end, because their corrections are small, honest and made before any enquiry. The severe end of the range is reserved for large, deliberate or resisted cases, which is exactly how an ordinary penalty regime is meant to work.
The single most important lever you control is timing. The regime treats a taxpayer who comes forward voluntarily very differently from one who is caught.
If you file or correct before Hacienda contacts you about it, you are in the lenient territory of reduced fixed fines and, at most, modest surcharges. If Hacienda opens an enquiry first, you lose that advantage and the outcome is harsher.
This is why silence is the worst strategy. Every month a known problem sits untouched is a month in which Hacienda might act first and move you into the harsher column. Acting voluntarily is not just cheaper, it is the entire mechanism by which the mild regime is unlocked.
A situated warning worth stating plainly: waiting to see whether anyone notices is a gamble that can only cost you the lenient treatment, and with automatic information exchange between tax authorities, your UK assets are far less invisible than they once were.
You correct a Modelo 720 by filing again, and there are two routes depending on what went wrong.
In both cases you are amending the record for a specific year, so it matters that you identify the correct year and category. A first-time late filing, where you should have filed and never did, is filed as a normal Modelo 720 for the relevant year, simply submitted after the deadline.
The mechanics are handled online through the AEAT portal using a digital certificate or Cl@ve, but the mechanics are rarely the hard part. The judgement about which year, which category, and whether a complementary or substitute route applies is where most people benefit from a second pair of eyes.
It helps to separate two different situations that people lump together as a Modelo 720 problem.
The first is never having filed when you should have. Perhaps you became resident, your UK accounts and investments were well over EUR 50,000, and no one told you the form existed. Here the fix is a late first-time declaration for the year or years in which the obligation arose.
The second is having filed, but wrongly. Perhaps you missed a category, understated a value, or failed to file again when a category rose by more than EUR 20,000. Here the fix is a complementary or substitute declaration to put the specific error right.
Getting this distinction right at the outset avoids the common error of filing the wrong type of correction, which can create confusion in the record rather than clearing it.
Because Modelo 720 is informational, the form itself never generates tax. But a correction can occasionally surface income or gains that were not declared on the ordinary return, and that is where a surcharge, rather than a fixed fine, comes in.
The clearest example is foreign income that should have appeared on your Spanish income tax return, such as interest, dividends or rental income from UK assets. If putting the record straight means also declaring that income late, a late-filing surcharge applies to the tax on it.
These voluntary late-filing surcharges are modest and rise with delay, broadly in the region of 1% to 15% depending on how late the payment is, rather than the punitive multiples of the old regime. Interest may also apply. But this is the ordinary cost of paying tax late, not a special Modelo 720 penalty.
For many British expats, particularly retirees whose foreign income is already declared and taxed correctly, the correction is purely about the disclosure, and no additional tax arises at all. The fear of a hidden tax bill is usually worse than the reality.
The point to hold on to is that the disclosure and the tax are two separate questions. Fixing the disclosure does not create a tax charge. It only reveals whether a tax charge already existed and was missed. If your foreign income has been reported properly on your Spanish returns all along, the Modelo 720 correction stands alone as an informational fix, with nothing further to pay beyond a modest fixed fine.
A correction done in a panic can create fresh problems. A few recurring mistakes are worth avoiding.
The last point is the one that quietly does the most damage. There is a natural temptation to research endlessly before acting, but the value of a voluntary correction decays the longer the known problem sits. Careful is good. Frozen is not.
Because currency movement changes reported values, understanding how the year-end exchange rate sets your euro figures is often part of getting the numbers right, especially where a category is close to the EUR 50,000 or EUR 20,000 lines.
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It helps to see how this plays out in practice, so consider two British expats in Spain who each discovered a Modelo 720 problem in the same week.
The first, a retired couple in Valencia, realised they had never filed at all. When they moved over, their UK savings, a modest investment portfolio and a retained flat in Bristol comfortably exceeded EUR 50,000 in two categories, but nobody had mentioned the form. Their instinct was dread. In reality, their UK interest and rental income were already being declared and taxed correctly on their Spanish returns, so there was no hidden tax. The correction was a late first-time Modelo 720 for the relevant year, filed voluntarily. The exposure was a fixed fine at the lower end, not a percentage of their assets. What they described afterwards was relief, not punishment.
The second, a younger remote worker in Barcelona, had filed a Modelo 720 but only reported his UK bank accounts, forgetting an investment account that had grown past EUR 50,000. He also had some UK dividend income he had not declared. His correction had two parts: a complementary declaration to add the missing investment category, and a late declaration of the dividend income on his income tax return, which carried a modest late-filing surcharge on the actual tax due. Still nothing like the old regime, and still far cheaper for having come forward first.
Neither case is unusual. They are close to the median experience once the old mythology is stripped away.
This is a situation where the right sequence matters more than the paperwork, and where a calm second opinion is worth a great deal.
The aim is not to make the problem bigger by touching it. It is to close it cleanly, in the right order, while the mild regime is still available to you.
If you are reading this and thinking:
then the useful next step is not to file something in a hurry. It is a short conversation to establish what, if anything, needs correcting and in what order.
Most of these situations resolve into something far smaller than the fear suggested. The relief of knowing the actual size of the problem is usually the first thing people notice.
Correcting a Modelo 720 is not the ordeal the old reputation implies.
It is NOT about:
It is about:
The expat who stays silent keeps a small problem alive and risks turning it into a larger one. The expat who corrects voluntarily usually discovers the whole thing was manageable all along. That difference, once again, comes down to acting while the window is open.
No. The old regime, which included a 150% surcharge, no effective time limit, and treating undeclared assets as unjustified gains, was struck down by the Court of Justice of the European Union in January 2022 and removed by Law 5/2022. Modelo 720 now falls under the ordinary General Tax Law penalty rules.
Under the ordinary regime, fixed fines run broadly from around EUR 300 up to about EUR 20,000 per category, with the lower end applying to modest or voluntary corrections. Because the form is informational, in many cases no additional tax is due at all.
You file again for the relevant year. Use a complementary declaration to add missing information, or a substitute declaration to replace a filing that was materially incorrect. If you never filed when you should have, submit a late first-time declaration for the relevant year.
Yes, enormously. A voluntary correction made before Hacienda opens an enquiry keeps you in the lenient regime of reduced fixed fines and modest surcharges. If Hacienda contacts you first, the penalties are higher and you lose the benefit of coming forward.
The form itself never charges tax, because it is informational. A correction only produces a tax cost if it also surfaces income or gains that should have been declared on your ordinary return, in which case a modest late-filing surcharge of roughly 1% to 15% applies to that tax.
There are three categories: foreign accounts, foreign securities and insurance, and foreign property. A category must be reported when its total exceeds EUR 50,000 at year-end, and reported again when it rises by more than EUR 20,000 above the last figure declared.
Working with internationally mobile clients means dealing with more than one set of rules, assumptions, and long-term unknowns. Taylor’s role sits at that intersection, helping individuals and families make sense of finances that span borders, currencies, and future plans.
Clients typically come to Taylor when their financial life no longer fits neatly into a single country. Assets may sit in different jurisdictions, income may move, and long-term decisions such as retirement, succession, or relocation need advice that holds together across regulation, not just on paper.
This article is for information purposes only and does not constitute financial advice. Financial planning outcomes depend on individual circumstances, residency, tax status, and objectives. Professional advice should always be sought before making financial decisions.
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