Assuming or Subrogating the Seller's Mortgage When You Buy Abroad

Published on: July 5, 2026

Please note: This article is general information, not tax, legal, or financial advice. Mortgage, stamp-duty and tax rules differ by country and change over time. Confirm the specific loan terms and your own position with the lender and a qualified local adviser before you rely on any of it.

When you buy a property that still has a mortgage on it, there are two ways to deal with that loan. The obvious one: the seller cancels their mortgage at completion, and you arrange a brand-new loan of your own. The less obvious one, and sometimes the far cheaper one: you step into the seller's existing mortgage and keep it running, same outstanding balance, and often the same rate and term.

That second route has a name in most European markets, subrogación del deudor in Spain, accollo del mutuo in Italy, and for the right buyer it can save real money on stamp duty and hand you an interest rate that is no longer available on the open market. It is also widely misunderstood, and it is not available everywhere. Here is how it actually works.

What "assuming" or "subrogating" a mortgage means

In a debtor subrogation, the buyer replaces the seller as the borrower on the existing loan. You inherit the outstanding capital, the remaining term, the interest rate and type, any products tied to the loan (such as insurance), and the mortgage conditions as written into the original deed. The bank stays the same; only the person who owes the money changes.

Do not confuse this with two similar-sounding things:

• Creditor subrogation (also called subrogación de acreedor) is when you move your own mortgage from one bank to another to get a better rate. Different transaction, different purpose.
• A fresh mortgage is exactly that, a new loan, newly underwritten, with the old one cancelled.

This article is about the first case only: taking over the seller's loan as part of buying their property.

Why buyers do it: two real advantages

1. It can avoid stamp duty. In Spain, a buyer subrogating into the seller's mortgage debt as part of a property purchase is not subject to stamp duty (AJD) on that subrogation, provided the essential conditions of the loan are not changed. This is long-standing tax-authority doctrine, and the Spanish Directorate General of Taxes reconfirmed it in binding ruling V0745-25 (28 April 2025), clearing up uncertainty that had lingered after an unrelated 2020 Supreme Court decision. The reasoning: a simple change of debtor is not a new taxable event, because it does not create a new, independently-registrable right. Crucially, that protection only holds if you leave the loan's core terms alone. Modify the principal, the mortgage liability, the repayment schedule or the guarantees, and you can trigger AJD, because now there is a fresh, taxable registration.

2. You can inherit a better rate. If the seller locked in a low fixed rate years ago and market rates have since risen, taking over their loan means taking over that rate. In a higher-rate environment this can be the single biggest reason to subrogate rather than refinance. You also avoid the cost of cancelling the old mortgage and opening a new one from scratch.

There is a smaller third benefit: in some cases the paperwork and underwriting are lighter than originating a completely new loan.

The catch: the bank has to approve you

Assuming a mortgage is not automatic, and this is the point most buyers miss. The lender is being asked to swap a borrower it already knows for one it does not, and it will assess the incoming buyer's creditworthiness exactly as it would a new applicant. The bank can refuse, or impose conditions, and for a non-resident buyer with income and credit history in another country, that assessment can be the hardest part of the whole deal.

So before you count on subrogation, get the bank's position in writing early: will it accept you as the new debtor, on what terms, and with what fees? A subrogation that the seller's bank will not sanction is not a plan.

What you inherit, and what to check first

Because you are stepping into an existing contract, you take it as it stands. Before committing, confirm in writing from the bank:

• The exact outstanding balance and the remaining term.
• The rate and type (fixed or variable, and the index if variable).
• Any tied products, life or home insurance, for example, that came with the loan.
• Whether there are arrears, penalties or other charges on the account.
• Any cancellation or subrogation fees the seller or you will owe.

Just as importantly, run the same debt-and-charges due diligence you would on any purchase abroad, verify there are no undisclosed liens or embargoes attached to the property beyond the mortgage you are assuming. (See our guide on checking for hidden debts and liens before buying abroad.)

Where it works, and where it usually doesn't

Spain, common and tax-efficient. Subrogación del deudor is a normal part of the market. The AJD exemption above makes it attractive, and the mechanics are well understood by Spanish notaries and banks. Watch the seller's cancellation fee, any bank subrogation fee, and remember that each autonomous community sets AJD if you end up modifying the loan.

Italy, the accollo del mutuo. Italy has a direct equivalent. It comes in two forms: accollo liberatorio, where the seller is fully released from the debt (which requires the bank's consent), and accollo cumulativo, where the seller remains secondarily liable. For a clean exit for the seller and a clean transfer for you, the liberatorio version, with the bank's sign-off, is what you want.

France, usually not assumable. French mortgages are generally not freely transferable to a buyer. Some older fixed-rate loans contain a transférabilité clause (a transfert de prêt), but it is uncommon and comes with conditions. In most French purchases the realistic path is a new loan, with the seller's mortgage cleared at completion. Do not assume assumption is possible, check the specific loan.

Everywhere else, check first. In many markets, assumable mortgages are rare or heavily conditional. The two questions are always the same: is the loan legally transferable at all, and will the lender consent to you as the new borrower?

New mortgage vs. subrogating the seller's mortgage

When it makes sense

Subrogation is worth pursuing when the seller's existing rate beats what you could get today, the remaining term suits you, the tied products are acceptable, and the bank is willing to take you on. If rates have fallen since the seller's loan was written, or you need materially different terms, a fresh mortgage is usually simpler, even accounting for the stamp-duty and cancellation costs a new loan avoids. Run both numbers, including all fees, before deciding.

Frequently asked questions

What is mortgage subrogation in Spain?
It is the transfer of a mortgage from one party to another. When buying a property, subrogación del deudor means you take over the seller's existing mortgage as the new borrower, inheriting its balance, rate and terms, rather than the seller cancelling it and you arranging a new loan.

Do I pay stamp duty when I assume the seller's mortgage in Spain?
No, the Spanish tax authority has confirmed (most recently in binding ruling V0745-25 of April 2025) that a buyer's subrogation into the seller's mortgage debt is not subject to AJD stamp duty, provided the loan's essential conditions are not modified. Change the principal, liability, schedule or guarantees and you can lose that exemption.

Can the bank refuse to let me take over the mortgage?
Yes. Subrogation requires the lender's approval. The bank assesses the incoming buyer's creditworthiness like any new applicant and can decline or attach conditions, which is often the biggest hurdle for non-resident buyers.

Is assuming a mortgage cheaper than getting a new one?
It can be. You avoid the cost of cancelling the old loan and, in Spain, the subrogation itself avoids AJD. The larger saving is usually the interest rate, if the seller's rate is lower than today's, you keep it. If today's rates are lower, a new mortgage may win.

Can I assume a mortgage when buying in Italy or France?
In Italy, yes, it is called accollo del mutuo, with the bank's consent needed to fully release the seller (accollo liberatorio). In France it is usually not possible; most French loans are not assumable, and buyers typically take a new mortgage while the seller's is cleared at completion.

Related reading on JanusHermes: checking for hidden debts and liens before buying abroad, our guide to mortgages for non-resident buyers, and how the civil-law notary system works.

Sources & further reading: Banco de España, Cliente Bancario (mortgage subrogation); Dirección General de Tributos binding ruling V0745-25, 28 April 2025 (analysis via Garrigues and Ashurst); Article 31.2 of the Spanish ITPyAJD Law; general Italian civil-law guidance on accollo del mutuo.

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This guide is general information, not legal, tax, or financial advice. Rules vary by country and change over time, and the figures here are indicative. Always confirm the current requirements for your specific situation with a qualified local professional.