Renegotiating your Spanish mortgage: what actually costs you stamp duty, and what doesn't

You signed your Spanish mortgage at the rate the market offered that year. Rates moved since — maybe in your favour. Asking your lender to change the deal sounds simple. Then someone mentions stamp duty on the new paperwork, and the idea quietly gets dropped.

For the one change that matters to most people — the rate, or how long you have left to pay — that fear has no basis. The law says so directly.

Changing your rate or your term: zero stamp duty, by national law

When you agree a change with your existing lender to the interest rate, the term of the loan, or both — called a novación modificativa — Spanish national law exempts it outright from the notarial stamp duty (AJD) that would otherwise apply to a mortgage deed. Not a discount: a straight exemption.

In the Comunitat Valenciana, the regional government goes further and adds its own 100% rebate on the same change, as a backstop. Either way the result is the same number: zero.

A second home doesn't get the broader relief — and that's the part people miss

Where it gets more specific: the regional rebate also covers a wider set of changes — the amortisation method, or 'any other financial condition' of the loan — but only when the mortgaged property is the borrower's actual habitual residence at the time you sign the change. A Spanish holiday home, by definition, is not that.

So if you own a second home and want to change only the rate or the term, you're fully covered — that's the exemption everyone gets, habitual residence or not. If you want to restructure further — the amortisation method, or other financial terms beyond rate and term — that broader rebate doesn't apply to your holiday home, and the change could fall back under ordinary stamp duty instead.

Staying with your bank, or switching to a new one, are two different routes

What this article covers so far — novación — means agreeing the change with the lender you already have. There is a separate route: moving the mortgage to a different lender entirely, called subrogación. Your current bank cannot block it, and cannot refuse the payoff once the new lender settles the debt — though it does get a short window to counter-offer and keep you, if it chooses to.

If you do switch lenders, the new mortgage deed follows the same cost split as any new Spanish mortgage: the new bank pays the notary, registry, paperwork agent and stamp duty on that deed, by law. Before you accept, the new lender has to hand you a written document showing the exact costs and the legal cap on what your old bank can charge you to leave.

Either way, nothing here changes what you still owe on the loan itself — only what it costs, in tax and fees, to get a better deal on it.