The Letter From the Tax Office: A Real Greek Unexplained-Wealth Case

The line that mattered was near the bottom of the page: a polite request, in formal Greek, to explain the origin of a credit that had landed in a Greek bank account almost three years earlier. Alan had bought a house near Nafplio with money he had earned and saved over a working life in Bristol. He had done nothing wrong. And yet the letter, and the flat 33 percent it hinted at, was enough to keep him up for a week.

This is one of the most common situations we see, and one of the most misunderstood. So rather than explain the rule in the abstract, which we do in our companion guide on bringing money into Greece, this article follows how it plays out in practice. We use one illustrative client story, and set it against a real decision handed down in Greece this month, where the same rule cost a taxpayer more than 155,000 euros.

The two cases turn on a single provision of Greek law. What separated their outcomes is worth understanding before a letter of your own ever arrives.

1. The letter that started it

In 2022, Alan sold a buy-to-let flat in the UK and moved most of the proceeds, a little over 185,000 euros once converted, into a Greek bank account to buy a stone house inland from Nafplio. At the time of the transfer he was still living and working in the UK, still a UK tax resident, and only spending long summers in Greece. He completed his move the following year and became a Greek tax resident in 2023.

In the spring of 2026, a letter arrived from the tax office asking him to document where the 2022 credit had come from. By then he had tidied up his UK affairs and closed the account the money had passed through.

Nothing about this is unusual. Large incoming transfers are a recognised trigger for review in Greece, and the fact that the money is foreign is almost never the problem. The problem, when there is one, is whether the paper trail proving its origin still exists at the moment somebody asks for it.

2. What the tax office is actually asking

Article 21(4) of Law 4172/2013, the Greek Income Tax Code, treats an increase in wealth arising from an unlawful, unjustified or unknown source as profit from business activity. Under Article 29, that profit is taxed at a flat rate of 33 percent, applied to the sum itself and not to a margin.

Read the wording closely and the reassurance is already in it. The law does not say illegal money. It says unlawful, or unjustified, or unknown. Where the origin of a credit is clear and documented, there is no unexplained wealth increase, and the provision simply does not apply. The letter is a request for evidence, not a verdict.

The one-line version. This is a documentation problem, not a tax problem. Money with a clear, evidenced history is safe. Money whose history can no longer be shown is exposed, however honestly it was earned. Everything below turns on that distinction.

3. A real case, decided this month

To see what happens when the evidence is not there, look at a decision reported in the Greek financial press in July 2026. The Dispute Resolution Directorate (the ΔΕΔ, the body that reviews tax appeals before they reach the courts) rejected a taxpayer’s appeal and upheld an income tax assessment of 155,482.19 euros for the 2015 tax year.

The audit had centred on three cash deposits into joint bank accounts, of 200,000 euros, 18,170 euros and 50,000 euros, totalling 268,170 euros. The taxpayer argued the money came from already taxed income of earlier years, such as pensions, rents, interest and dividends, that had been withdrawn from other accounts and then redeposited, and that redepositing your own money is not prohibited.

The decision, in short. The ΔΕΔ found the taxpayer’s claims unproven. The real origin of the deposits was not sufficiently documented, and there was no evidence the amounts had already been taxed or were lawfully exempt. The deposits were therefore treated as an increase in wealth of unknown source under Article 21(4), and the full assessment stood.

The explanation may well have been entirely true. It did not matter, because it could not be shown. That is the whole lesson in a single decision.

Two features of that case are worth naming plainly, because they are exactly what made it go the way it did. The money went in as cash, which carries no built-in record of where it came from. And the taxpayer appears to have been a Greek resident, so none of the exemptions that protect recent arrivals from abroad were in play. Neither of those things was true for Alan.

4. Why the same rule points two different ways

It is tempting to read a 155,000 euro headline and assume the worst about your own transfer. The more useful reading is that the same provision produces opposite results depending on two things you can largely control: whether the money arrived with a paper trail, and whether your dates place you inside one of the exemptions.

	The 2026 ΔΕΔ case	Alan’s transfer
How the money arrived	Cash deposits, no inherent record	Bank transfer, full trail from a UK sale
Residency when it landed	Greek resident, no relocation exemption	Still UK resident, inside the relocation window
Could the source be evidenced?	No, claims remained unproven	Yes, sale contract and statements existed
Rule that applied	Article 21(4), taxed at 33 percent	Exempt import, declared as non-taxable capital
Outcome	155,482.19 euros upheld	No tax, position accepted

5. What we actually checked for Alan

When Alan forwarded us the letter, the work was not dramatic. It was a sequence of specific questions, answered with his dates and his documents in front of us.

Was he a Greek tax resident when the money landed? No. In 2022 he was still resident in the UK. Greek case law treats the date the money is deposited as the decisive moment, so his position was fixed by a date he could not change, and in his case that date worked in his favour.

Which exemption fit? Greek law lists categories of person who do not have to justify how they acquired foreign currency abroad. Someone who was a tax resident of another state when the funds arrived is one. Someone who relocates within two years of a qualifying period abroad is another. Alan fit comfortably inside the picture those categories describe.

Where should it have appeared on his return? Import of foreign currency by current or former residents abroad belongs in codes 781-782 of the E1 return. Declaring it there records the transfer as a non-taxable capital import in the correct year, and lets it cover Greek presumptive expenditure tests. It is a small administrative act with a large protective effect, and it was the step that had been missed.

Did the evidence still exist? Just. The notarised sale contract was on file, and although the UK account had been closed, the statements covering the sale and transfer had been downloaded before it was shut. That single habit, saving the record before closing the account, is what turned a worrying letter into a short piece of admin.

The mistake that does the damage. Closing the foreign account before archiving its full history. Banks are not obliged to reconstruct years of records for you later, and certainly not to a tax office deadline. Download and store everything before you close anything.

6. The single thing that separated the two outcomes

Strip both stories back and the same rule is doing the same job in each. It asks one question: can you show where this came from? The taxpayer in the ΔΕΔ case could not, and a genuine explanation that could not be evidenced was treated as no explanation at all. Alan could, and a large foreign credit became a declared, non-taxable line on his return.

The burden of proof is the part people underestimate. Greek courts have been clear that once the tax authority establishes that wealth increased, it is for the taxpayer to show the money was taxed, lawfully exempt, or outside the scope of tax. General assertions about foreign income do not clear that bar. Specific documents do.

7. If you have already moved money, or are about to

The good news runs in one direction: this is far easier to handle before a letter arrives than after. If you are planning a transfer, the sequence of your residency change and the transfer is not a detail, it decides which regime and which exemption apply. If the money is already here, the position can usually be put right by declaring it correctly and assembling the evidence while it is still easy to obtain.

A few things worth doing now, whatever stage you are at:

• Save full statements for the period the money was accumulated, not just the transfer itself, and do it before closing any foreign account.
• Keep the sale contract, income certificates and your foreign tax returns for the relevant years together in one place.
• Check which of the exemption categories your dates put you in, because an exemption you never claim, on a return you never file, protects nobody.
• If the sum is large and you are becoming a Greek tax resident, look at whether Article 5A interacts with your plans before you file anything.

If you have already had a letter, the same principles apply, with more urgency. What matters is answering the actual question it asks, with documents, rather than with a narrative.

Frequently asked questions

The Greek tax office sent me a letter about a transfer from years ago. What is it? It is almost always a request to explain the source of a credit to your bank account. Greek law treats an increase in wealth from an unlawful, unjustified or unknown source as business profit, taxed at a flat 33 percent under Article 21(4) of Law 4172/2013. The letter is not an accusation, it is a request for evidence. If you can show where the money came from, and it fits an exemption or was already taxed, the provision does not apply.

I brought money into Greece before I moved here. Am I at risk? Usually much less than the headlines suggest. Greek law lists categories of people who do not have to justify how they acquired foreign currency abroad, including those who were tax residents of another state when the money arrived and those who relocated within two years of a qualifying period abroad. Whether you fall inside one of those categories depends on your exact dates and your account history. The risk is rarely the transfer itself, it is not being able to evidence its origin later.

I already closed the foreign account the money came from. What now? Try to reconstruct the record before it is needed rather than after. Request full statements for the accumulation period from the bank, retrieve your foreign tax returns for the relevant years, and gather any sale contract or income certificate that shows where the funds came from. Banks are not obliged to rebuild a decade of history for you under a deadline, so the sooner this is assembled the stronger your position.

Does a case like the 155,000 euro one apply to foreigners bringing money into Greece? The same legal provision applies to everyone, but that particular case involved undocumented cash deposits by a Greek resident who could not prove the money had already been taxed. Most foreigners who move funds by bank transfer, keep the paper trail, and arrive within the relevant relocation window fall into a category that is specifically exempt from having to justify the source. The rule that caught that taxpayer is the same rule that leaves most documented expat transfers untouched. The difference is evidence.

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Alan is an illustrative example used to explain how the rules work in practice, not a specific identifiable client. The 2026 decision described is a real determination of the Dispute Resolution Directorate as reported in the Greek press in July 2026, summarised here for general information. This article explains how the rules are structured, it cannot tell you which category you fall into, because that depends on your dates, your residency history and your documents. Greek tax rules and deadlines change frequently.