What is a Unilateral Mortgage and when to sign it?

By Juan Madridejos Velasco and Luis Alberto Álvarez Moreno, Notaries of Barcelona and partners at J&LA Notarios Asociados.

If you do not know what the constitution of a unilateral mortgage is, today we explain what it is and when a unilateral mortgage is advisable, from our notary office in Barcelona. At JLA Notarios we are Notaries in Barcelona specialising in mortgage deeds in Barcelona, so do not hesitate to consult us about any matter related to this very particular type of mortgage.

Definition and characteristics of a unilateral mortgage

With the name unilateral mortgage we define a mortgage created by a debtor without the intervention of a creditor. That is to say, it is established without the lender accepting the mortgage. It is a voluntary mortgage and of a special nature, since the unilateral mortgage is not a mortgage loan, but exists to guarantee the fulfilment of a duty, such as a debt to the Treasury, through an asset that is owned. Keep reading to learn more about what a unilateral mortgage is and when it is advisable.

Steps to establish a unilateral mortgage

Thus, the person who wishes to mortgage a property, usually real estate (for this reason it is also called a unilateral real estate mortgage), let us call them a debtor or borrower, must grant a unilateral mortgage deed before a Notary, which the creditor (or lender) will later accept or not.

The unilateral mortgage deed must be registered in the Land Registry and this can be done without having to pay taxes.

It is necessary for the lender to accept it within two months from the request and for a marginal note of acceptance to appear in the Registry, since otherwise the borrower may cancel it unilaterally. To do so, the lender or creditor must go to the Notary and accept the deed of constitution of the unilateral mortgage.

Characteristics

  • The unilateral mortgage must be accepted by the person in whose favour it is established.
  • The acceptance must be recorded in the Register by marginal note.
  • The effects are retroactive, that is, it applies from the date of its constitution.
  • Until it is accepted, no taxes are paid.

Unilateral mortgage in favour of Hacienda

The constitution of a unilateral mortgage is often granted in favour of different institutions, seeking to defer taxes or split debts. With this, debts against social security or the Treasury are guaranteed. For this reason, it is common to find them in favour of the Public Administration, whether state, regional or local (known as a unilateral mortgage in favour of the town hall).

Thus, the unilateral mortgage in favour of the tax agency is used as a payment guarantee when there is a debt with the Treasury. If the tax agency did not accept the mortgage, it would not be constituted. When a unilateral mortgage is in favour of the Treasury, its debtor is the State as creditor, which is why it is also known as a unilateral mortgage in favour of the state.

Advantages of the Unilateral Mortgage

Among the benefits provided by the unilateral mortgage, we find the following:

  • It offers guarantees to public administrations.
  • It facilitates the mortgage process for creditors.
  • It is exempt from taxes until it is established.
  • It facilitates the debtor's payment of incurred debts.

Example of unilateral mortgage

Let us take an example of a unilateral mortgage. Juan (borrower) fails to comply with the agreed terms regarding a payment to the Tax Agency. His debt accumulates and he decides to mortgage his property in favour of the Tax Agency, processing a deed of constitution of a unilateral real estate mortgage. This ensures the fulfilment of the payment obligation and the default interest. When the obligation is fulfilled, that is, when the tax debt and its interest are paid, the mortgage is extinguished.

Companies can also process unilateral mortgages. Thus, it can be established to guarantee the debt in the purchase of shares or processed as a guarantee for a postponement of bankruptcy proceedings.

Frequently asked questions related to unilateral mortgages

Now that you know what a unilateral mortgage is and when it is advisable, we want to explain how to cancel it. The cancellation of a unilateral mortgage is regulated in article 237 of the Mortgage Regulations. It is important to know that once it is registered in the Property Registry, it cannot be cancelled until two months have passed.

The cancellation of a unilateral mortgage can occur under two circumstances:

  • Rejection: that the creditor does not want it, expressing this will in a deed or not responding to the request
  • That the debtor/borrower cancels it after the time stipulated by law

The debtor or borrower may request the cancellation of the mortgage if acceptance by the creditor is not recorded once two months have passed since the request. To accept it, it must also be registered in the Registry by marginal note.


In the event that the creditor or lender accepts the mortgage, it cannot be cancelled until the debt incurred is paid.


The asset acts as collateral for a debt, as it is the property through which the lender can recover the amount invested if the terms of the agreement are not met. In case of non-payment, the lender can sell the asset and recover the debt.


Unilateral mortgages are subject to the Tax on Documented Legal Acts at the rate established by the regional legislation regarding this tax. The taxpayer for this tax is the person who accepts the mortgage constituted in their favour.

In the most common cases, which are those in which the unilateral mortgage guarantees a debt contracted with a Public Administration, the current position of the Supreme Court and the TEAC is, for these cases, that the taxpayer would be the Public Administration and that as a Public Administration it would be exempt from paying the Tax on Documented Legal Acts.


Specialties of unilateral mortgages in Barcelona and Catalonia

Is there any speciality in unilateral mortgages before a Notary in Barcelona and Catalonia?

Unilateral mortgages before a Notary in Barcelona and Catalonia do not have special features in the Notary's office, except that they will only be signed by the person constituting the mortgage. Therefore, the appearance of the mortgage creditor will never be necessary in this type of mortgage in Barcelona and Catalonia.

As with other mortgages in Barcelona and Catalonia, it will be necessary to process the prior material transparency certificate when the mortgagor is an individual. Therefore, individuals will have to attend the notary on two occasions. In contrast, companies only have to attend the signing of the mortgage at the notary, without processing a prior mortgage certificate in Barcelona or Catalonia.

Is there any tax speciality regarding unilateral mortgages before Notaries in Barcelona and Catalonia?

There are no special tax provisions in Catalonia regarding unilateral mortgages. Therefore, the general rule is that they are subject to AJD (Tax on Documented Legal Acts) at the general rate of the Autonomous Community of Catalonia, which is 1.5%.

In the most common cases of unilateral mortgages in favour of the Administration, it is generally considered that the taxpayer is the Public Administration and that it is exempt from paying AJD. However, you should be aware that the TSJ of Catalonia has had some particular considerations in specific cases.

How to sign a unilateral mortgage with JLA Notarios?

We hope this article about what a unilateral mortgage is and when it is advisable has been helpful to you. If you need to process a deed of constitution of a unilateral mortgage in Barcelona, do not hesitate to contact our Notaries in Barcelona specialising in mortgages. You can do so by writing to us at the email bcn@jlanotarios.com or by filling in the contact form on our website. We will be delighted to assist you at our notary office on Avenida Diagonal in Barcelona. If you want to learn more about us and the services of our Notaries in Barcelona, we invite you to read the following article:

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