Source of Funds and Anti-Money-Laundering Checks for International Buyers

Source of funds and anti-money-laundering checks are now a routine part of buying a new-build home anywhere on the Costa del Sol, and international buyers feel them more than most because the paper trail for their money usually starts in another country. Spain applies the same rules from Estepona to Nerja: before a purchase can complete, several regulated professionals must confirm who you are, who ultimately owns the money and where that money came from. This guide explains what those anti-money-laundering (AML) checks are, who runs them, and exactly what documentary evidence a foreign buyer should prepare so completion is not held up.

Why source-of-funds checks apply to every Costa del Sol purchase

The legal backbone is Ley 10/2010 on the prevention of money laundering and terrorist financing, which transposes the EU anti-money-laundering directives into Spanish law ¹. It does not target foreign buyers specifically. It obliges a long list of professionals (the sujetos obligados, or obliged parties) to carry out customer due diligence on their clients, whatever the client’s nationality. Because a property purchase moves a large sum through the financial and notarial system, it is one of the most heavily checked transactions an ordinary person will ever make. Spain’s Financial Intelligence Unit and AML supervisor, SEPBLAC (the Executive Service of the Commission for the Prevention of Money Laundering), receives reports of anything that looks suspicious and oversees compliance ².

Practical translation: the checks are not personal, they are not optional, and they cannot be waived by paying more or completing faster. Preparing for them is simply part of the buying process.

Who is legally obliged to check you

Ley 10/2010 lists the obliged parties in its article 2. In a typical Costa del Sol new-build purchase, several of them will apply their own checks in parallel ¹:

• The notary and the property registrar (article 2.1.n), who must identify all parties and the beneficial owner before authorising and registering the deed.
• Banks and financial entities (article 2.1.a onwards), which run the fullest checks of all when you open a Spanish account, receive an international transfer or apply for a mortgage.
• Estate agents and property intermediaries (article 2.1.l), who must identify their clients and keep records.
• Lawyers and gestores (article 2.1) when they participate in or advise on the transaction or handle client money.

Each of them files and retains its own due-diligence record, which is why you may be asked for the same documents more than once by different parties. It is duplication, not disorganisation.

What «source of funds» actually means

Ley 10/2010 requires obliged parties to carry out formal identification of the client (article 3), to identify the titular real or beneficial owner where the buyer is a company or trust (anyone holding more than 25 per cent of the capital or voting rights, article 4), to understand the purpose and nature of the relationship, and to apply ongoing scrutiny (articles 5 and 6) ¹.

Within that framework, professionals distinguish two related questions. Source of funds is where the specific money for this purchase comes from (the sale of another property, savings, an inheritance, a company dividend, a mortgage drawdown). Source of wealth is how you built your overall financial position in the first place (a career, a business, investments). For a straightforward purchase the focus is source of funds; for larger sums, politically exposed persons or complex ownership structures, the bank or notary may probe source of wealth as well. The key point for a foreign buyer is that a declaration is not enough on its own: you need documents that trace the money.

The documents you should prepare

Gather these before you reserve, because they are far easier to obtain while you are still in your home country:

• Your passport and your Spanish NIE (foreigner identification number), which every foreign buyer needs to transact.
• Bank statements showing the funds accumulating over time, not a single unexplained lump sum landing the week before completion.
• Documentary proof for each origin of money: a completion statement or notarised deed if you sold a property, a probate document for an inheritance, dividend vouchers or company accounts for business income, or a redemption statement for investments sold.
• Evidence of employment or business income (payslips, tax returns) where savings are the source.
• The international transfer confirmations that move the money into Spain, ideally from an account in your own name.

Consistency matters more than volume. The story your documents tell should match the amounts and the names on the transfers. Money arriving from a third party’s account is the single most common reason a bank or notary pauses a transaction.

Getting money into Spain: cash limits and the S1 declaration

Spain restricts cash and monitors physical movements of money, so plan to move funds through the banking system. Two separate regimes apply.

Cash payment limits under Ley 11/2021: as a general rule any payment where one party acts as a business or professional cannot be made in cash for 1,000 euros or more. For private individuals who prove they are not tax resident in Spain and are not acting as a business or professional, the limit rises to 10,000 euros ³. In practice a property is never paid for in cash: the price passes by bank transfer or banker’s cheque, precisely so there is a clean record.

Cash movement declarations under article 34 of Ley 10/2010, filed on Modelo S1: you must declare physically carrying means of payment of 10,000 euros or more when entering or leaving Spanish territory, and 100,000 euros or more when moving them within Spain ¹². This is a declaration obligation, not a tax; failing to declare can lead to the money being seized.

How the checks fit into the buying timeline

Expect source-of-funds questions at three moments. First, when you open a Spanish bank account, the bank runs its own onboarding due diligence before it will hold your money. Second, if you take a mortgage, the lender scrutinises the origin of your deposit as part of its AML and affordability review. Third, at the notary on completion day, the notary confirms identities, records the exact means of payment for the price and checks the beneficial owner. The notary also reports the transaction to the authorities as a matter of course. Any inconsistency discovered at this last stage is the most disruptive, because it can stop the deed being signed.

These AML checks sit alongside, but are separate from, the tax mechanics of a Spanish purchase. For example, when the seller is a non-resident, the buyer must withhold 3 per cent of the price and pay it to the tax authority on the seller’s account using Modelo 211, with the non-resident then settling via Modelo 210 ⁴⁵. That withholding is a tax rule, not an AML rule, but it is one more reason every euro of the price is documented and traceable.

Practical tips for a smooth check

• Move money only from accounts in your own name. If funds sit with a spouse or a family member, transfer them to your account first and keep the record.
• Consolidate early. Bringing the deposit together in one traceable account weeks in advance beats assembling it from several sources at the last minute.
• Keep the paper trail in one folder: proof of each origin, the transfers into Spain and your NIE.
• Use a currency specialist or your bank for the international transfer, and keep the confirmation, rather than carrying cash.
• Tell your lawyer about anything unusual (a gift, a recent inheritance, a company distribution) up front, so the explanation is ready before anyone has to ask.

For the wider context, read our related guides on obtaining an NIE and opening a Spanish bank account, the step-by-step buying process, non-resident taxes and Modelo 210, and mortgages for non-residents, which together cover the practical and fiscal side of a Costa del Sol purchase. Approached in order, the anti-money-laundering checks become a formality rather than an obstacle.