Crypto source of funds and taxes when buying property abroad: what banks and notaries ask and when conversion is taxed

In brief

As of 6 November 2026, a lawyer or bank will usually ask for two things before accepting crypto-funded money: the source of funds (the money for this deal) and the source of wealth (how the whole pot was built). Tax is a separate question and depends on where you are tax resident: Cyprus charges 8% on crypto disposals from 1 January 2026, Portugal 28% on coins held 365 days or less (0% above), Spain 19% to 28% in the savings base, Germany nothing after one year, Georgia and Thailand (via licensed operators) 0% for individuals. The EU rules DAC8 have made platforms collect data on EU residents since 1 January 2026, with first reports in 2027. This is general information, not legal or tax advice.

Source of funds and source of wealth

Banks, notaries and lawyers do not treat crypto differently from any other large sum, but they ask for a longer chain of evidence, because the money has come from outside the banking system. The two questions are separate.

• Source of funds: where the money for this particular purchase comes from. For crypto this is the sale of coins, the exchange that paid out, and the bank account that received it.
• Source of wealth: how you came to own the coins at all. Salary, a business, mining, an earlier sale, an inheritance, earlier trading.

Law-firm guidance from the UK and Cyprus describes the same expectation: they want the original source of the crypto, the control of the wallet, the transaction history and the exchange records, and they note that converting coins to euros does not by itself answer the source-of-funds question. Lenders are often less clear: many banks have not published a policy for crypto-originated funds, so ask before you apply.

What is usually asked for

• Statements from a regulated, identity-checked exchange showing purchases, sales and withdrawals.
• A record of how the coins reached your wallet, and proof that you control it.
• The conversion itself: the sale order, the fiat payout, the bank statement of the receiving account.
• The origin of the first purchase: salary slips, a business income record, an earlier sale contract, a tax return.
• Tax filings for the years in which the coins were sold, where they exist.
• Identity and address documents that match every account in the chain.

The full list, with the order in which banks and notaries usually want it, is in our documents checklist. For Russian, Belarusian and Kazakh documents see documents from Russia and the CIS, and for what banks ask when large amounts move, bank questions when moving large sums.

When conversion is taxed

The principle is the same almost everywhere, with different rates: selling coins for fiat, swapping them for other coins or spending them is a disposal, and the gain is the difference between the price you got and the price you paid. Buying coins with fiat is normally not taxed. The tax is owed in your country of tax residence. The property country may also tax later gains from the sale of the property (see tax residency when relocating).

The practical point: paying for a flat with coins is treated, in most of the systems below, as a disposal at the market value on the day, even if no fiat ever reaches your account. We did not find that spelled out for every country, so read the list of cases below as a working assumption.

How some countries tax crypto

The information below comes from search summaries, mostly tax-software and advisory pages. Confirm current rates with an adviser.

• Cyprus. Since 1 January 2026 individuals pay 8% on crypto disposal gains (Article 20E), reported on the IR1 return by 31 July of the following year. Non-dom status does not remove the 8%, losses offset gains only within the same year. Capital gains on the Cyprus property itself are a separate 20% (see Cyprus capital gains tax on sale).
• Georgia. Personal income tax applies to Georgian-source income, and gains from exchanging crypto are described as outside it, so 0% for individuals (resident and non-resident, according to one law-firm guide). Crypto received as payment for services is business income and taxable. See Georgia capital gains tax on sale for the property itself.
• Portugal. Coins held for more than 365 days are exempt, held 365 days or less 28% (the boundary day is described differently by different sources, so plan around the stricter reading), counted first-in first-out per asset; swapping coins resets the clock. Platforms in blacklisted jurisdictions can change the result. Whether paying for property counts as a disposal is our inference, not a found rule. See Portugal capital gains tax on sale.
• Spain. Gains go into the savings base at 19% up to 28% (some sources give 30% at the top). Spending coins is a disposal. Staking and mining are usually taxed at general rates, which can reach about 47%. See Spain capital gains tax on sale.
• Germany. Private gains on coins held more than one year are tax-free under section 23 of the income tax act; for shorter holdings gains up to EUR 1,000 a year (since the 2024 tax year) are exempt, and above that the whole amount is taxable because it is an exemption limit, not an allowance. A proposal to remove the one-year rule was reported but we could not confirm its status, so check it. See Germany capital gains tax on sale.
• Thailand. No income tax for individuals on gains made through SEC-licensed operators from 1 January 2025 to 31 December 2029; foreign platforms and peer-to-peer trades may be taxable, and staking or mining income is not covered.
• UAE. There is generally no personal income tax on individuals; we did not recheck the position for 2026. The Dubai Land Department fee on the purchase remains (see Dubai capital gains tax on sale for the rest).
• Turkey. We did not find a reliable current statement of the crypto tax treatment, so ask a Turkish tax adviser. See Turkey capital gains tax on sale for property.

DAC8 and what the authorities will see

DAC8, the EU's eighth directive on administrative cooperation, took effect on 1 January 2026. Crypto service providers that serve EU residents must collect identity, tax residence and transaction data, and the first reports to tax authorities fall in 2027, with the deadline set by each country (the European Commission page speaks of nine months after the first reporting year; other sources give 31 January or 30 June 2027). Non-EU platforms are caught if they serve EU residents. Platforms may ask you for a tax identification number and restrict reporting-relevant services if you do not provide it. Practically: assume that your conversions will be visible to your tax authority, and declare them correctly.

Record keeping

• Keep exchange statements in the original format, not only screenshots.
• Keep the cost basis for every purchase: date, amount, price, fees.
• Keep the wallet addresses you used and the date you moved coins between them.
• Record the exchange rate on the day you converted or spent the coins, and the source of that rate.
• Keep the bank statement showing the incoming transfer, and the preliminary and final purchase contracts.
• Store everything for as long as your tax authority can ask for it, usually several years.

Mistakes

• Telling the bank one source of funds and showing another.
• Converting through an unregulated exchange or a peer-to-peer deal that leaves no statement.
• Ignoring the tax on conversion because the property is in a country with no tax on such gains. The tax follows your residence.
• Mixing business and private coins.
• Moving coins between wallets right before the deal, creating a history that is hard to explain.
• Leaving the cost basis undocumented, so the whole amount looks like profit.
• Assuming that a rule found in a blog applies to your case. Treat it as a question for an adviser.

FAQ

What is the difference between source of funds and source of wealth? Source of funds is where the money for this particular purchase comes from; source of wealth is how you built the whole amount in the first place. Banks and notaries may ask for both, and for crypto the second one usually needs more documents.

Is converting crypto to euros enough to prove the money is clean? Not by itself. Law-firm guidance, including from Cyprus, says conversion does not answer the source-of-funds question; the bank will still want the history of the coins and the exchange records.

Do I pay tax if I pay for a flat with coins directly? In most tax systems spending coins is a disposal at market value on the day, so yes, if there is a gain. We did not find an explicit rule for every country, so check with a tax adviser in your country of tax residence before paying.

What does DAC8 change for me? Since 1 January 2026 platforms collect your identity and tax residence data, and from 2027 they report to tax authorities. It does not create a new tax, but it makes conversions visible, so declare them.

Which countries tax crypto gains at 0%? Sources report 0% for individuals in Georgia (gains outside Georgian-source income), in Thailand through SEC-licensed operators until 31 December 2029, and in Germany for coins held more than one year. These are rules for residents of those countries, and they depend on conditions you need to check.