Banking Law and Guardianship and Financial Management in Spain

1. Introduction

In Spain, the relationship between banking law, guardianship and financial management changed substantially with Law 8/2021 of 2 June, which reformed Spanish civil legislation concerning persons with disabilities.

The modern system no longer starts from the idea that an adult should be judicially “incapacitated” and placed under ordinary guardianship (tutela). For adults who require assistance in exercising legal capacity, Spanish law now focuses on support measures, particularly curatela (curatorship), guarda de hecho (de facto support), voluntary support measures and preventive powers of attorney. Ordinary tutela is now principally reserved for minors in the circumstances established by the Civil Code.

This distinction is especially important for banking because support arrangements may determine who can assist with or, exceptionally, represent a person in matters involving:

• bank accounts;
• deposits and withdrawals;
• loans and mortgages;
• investment portfolios;
• securities;
• payment transactions;
• sale or encumbrance of property;
• management of income;
• inheritance assets; and
• other significant financial transactions.

The fundamental rule is that financial protection must be combined with the person's autonomy, will, wishes and preferences.

2. Law 8/2021 and the New Spanish Model

Law 8/2021 fundamentally changed the previous approach.

Article 250 of the Civil Code recognises several forms of support, including voluntary measures, de facto support, curatorship and judicial defenders.

Article 268 requires judicial support measures to be proportionate to the person's actual needs, preserve maximum autonomy and respect their will, wishes and preferences.

Article 269 goes further: a court establishing curatorship must specify the particular acts for which assistance is required. Representation by a curator is exceptional and must be expressly justified.

Therefore, a Spanish bank should not proceed on the simplistic assumption:

Disability = inability to manage money.

Instead, the relevant question is:

What support, if any, applies to this particular financial transaction?

3. Guardianship of Minors

Although adult disability law has moved toward supported decision-making, tutela remains relevant to minors.

Under Article 199 of the Civil Code, tutela applies to certain non-emancipated minors, including minors in situations of abandonment and minors not subject to parental authority.

A tutor who administers a minor's property must act diligently and in the minor's interests.

Article 228 expressly requires the tutor to administer the minor's assets with due diligence, report annually to the judicial authority on the minor's situation, and provide annual accounts concerning the administration.

Consequently, when a tutor deals with a bank on behalf of a minor, the bank must distinguish between the tutor's ordinary management powers and transactions for which additional judicial authority may be required.

4. Adult Curatorship and Banking

For adults, curatela is now the central formal judicial support mechanism.

The curator's authority is not automatically unlimited.

The judicial decision should identify the acts for which support is necessary.

This produces an important banking compliance principle:

The bank should examine the actual scope of the support measure rather than merely seeing that a curator has been appointed.

For example, a person might require support for complex investments or the disposal of significant assets while remaining able to perform ordinary banking transactions independently.

This approach was expressly reflected in Supreme Court Judgment 1143/2024, discussed below.

5. Financial Management by the Curator

Where the curator has financial responsibilities, those responsibilities must be exercised diligently and consistently with the support framework.

Article 282 requires the curator to perform the assigned functions with due diligence and to assist the individual in exercising legal capacity while respecting the person's will, wishes and preferences.

Accordingly, financial management should not simply become:

“The curator decides everything.”

The modern approach is closer to:

Person makes decisions + appropriate support → independent decision where possible.

Only where representative authority has exceptionally been established does the curator act on the person's behalf within the scope authorised by law and the judicial decision.

6. Inventory of Financial Assets

Financial accountability becomes particularly important when the curator possesses representative powers.

Article 285 requires a curator with representative functions to prepare an inventory of the person's assets within 60 days after taking office, subject to the applicable procedural requirements.

The inventory can include matters such as:

• bank balances;
• securities;
• investments;
• real estate;
• debts;
• receivables;
• valuable property; and
• other financial rights.

The rule creates an initial financial record against which subsequent administration can be assessed.

7. Judicial Authorisation for Important Financial Transactions

One of the strongest safeguards concerns major transactions.

Under Article 287, a representative curator requires judicial authorisation for specified acts, including certain transactions involving the disposal or encumbrance of real property, commercial or industrial establishments, particularly significant assets, valuable movable property and securities not traded on official markets.

This is highly relevant to banking.

For example, when a proposed financing transaction involves mortgaging protected property, a bank may need to establish whether the curator possesses the necessary judicial authority before completing the transaction.

The same principle can affect guarantees, major investment transactions and other acts falling within Article 287.

8. Ordinary Banking Transactions

Not every banking transaction requires judicial approval.

Routine financial administration must be distinguished from exceptional acts of disposition.

Depending upon the applicable support arrangement, ordinary transactions could include matters such as:

• paying household expenses;
• receiving income;
• paying taxes and utilities;
• ordinary account administration; and
• other transactions necessary for everyday financial management.

However, the precise answer depends upon the person's support arrangements and, where applicable, the judicial decision establishing the curatorship.

A bank therefore should not impose restrictions broader than the legal support measure itself.

9. Preventive Powers of Attorney

Spanish law also recognises preventive powers, which can be particularly important in financial planning.

A person can make arrangements in advance concerning who should provide support if circumstances later make support necessary.

These arrangements may cover banking and financial matters.

Their importance was strongly confirmed by the Supreme Court in STS 1449/2024.

The Court held that where a sufficient preventive general power already exists, establishing an additional judicial curatorship is not automatically necessary. Judicial support is subsidiary to sufficient voluntary support arrangements.

This has major implications for banks because authority over an account may sometimes derive from a valid preventive power rather than a judicial curatorship.

10. Protection Against Financial Abuse

Financial-management law must also protect individuals against:

• conflicts of interest;
• undue influence;
• unauthorised transactions;
• misuse of assets; and
• negligent administration.

Article 270 permits the court to establish appropriate controls to prevent abuse, conflicts of interest and undue influence. It can also require information from the curator concerning the person's personal or financial circumstances.

Where a particular conflict arises between the curator and the supported person, Spanish law also provides for appointment of a defensor judicial in appropriate circumstances.

This prevents the person who has the conflict from simultaneously controlling both sides of the transaction.

11. Accounting and Judicial Supervision

Financial administration is subject to accountability.

Under Article 292, when curatorship terminates, the curator must provide a justified final account of the administration to the judicial authority within the prescribed period.

Article 294 further establishes liability for damage caused through the curator's fault or negligence.

Spanish procedural legislation also permits courts, where accounts involve sufficiently complex operations, to obtain accounting or auditing expertise.

These safeguards are important where the managed estate contains investments, businesses, securities or substantial bank deposits.

12. Protected Assets

Spain also has a specialised regime for the protected assets (patrimonio protegido) of persons with disabilities, established under Law 41/2003 and subsequently modified by Law 8/2021.

The beneficiary remains the owner of the protected estate.

The constituting document must contain an inventory and rules governing administration and, where appropriate, supervision.

The legislation requires the assets and their returns to be used for the beneficiary's vital needs or maintenance of the productivity of the protected estate. The Public Prosecutor (Ministerio Fiscal) has an important supervisory role.

This arrangement may therefore coexist with ordinary bank accounts and other support mechanisms but should not simply be confused with curatorship.

13. Role of Banks

Banks are not courts and do not decide whether someone should have a curator.

Their practical responsibility is to identify and respect legally effective authority.

When presented with a support arrangement, a financial institution may need to determine:

Who is the account holder?

Is there a curator, tutor, attorney or other legally recognised support person?

What powers does that person possess?

Does the customer retain authority to carry out this particular transaction personally?

Does the transaction require judicial authorisation?

Is there a conflict of interest?

Is the transaction consistent with the operative support arrangement?

The modern regime therefore requires transaction-specific analysis rather than a blanket assumption that appointment of a support person transfers complete control of the individual's finances.

14. At Least Six Important Spanish Cases

The following Spanish Supreme Court decisions are particularly relevant.

Case 1 — STS 589/2021, 8 September 2021

Supreme Court, Civil Chamber, Plenary Session
ECLI: ES:TS:2021:3276

This is one of the foundational judgments interpreting the new system introduced by Law 8/2021.

The Supreme Court explained that the reform replaced the traditional model centred upon declarations of incapacity with a system centred upon providing whatever support is actually required.

Judicial support must satisfy principles of:

necessity + proportionality + maximum autonomy + respect for will, wishes and preferences.

The Court also recognised that curatorship must be adapted to the person's actual circumstances rather than imposed as an undifferentiated restriction.

Banking significance

Banks should therefore avoid treating a support order as a general prohibition against independent financial activity unless the applicable measure actually has that effect.

15. Case 2 — STS 706/2021, 19 October 2021

Supreme Court, Civil Chamber
ECLI: ES:TS:2021:3770

The Supreme Court again applied the principles introduced by Law 8/2021.

It confirmed the transition away from the former declaration-of-incapacity model and toward individualised judicial support.

The Court emphasised the importance of respecting the wishes and preferences of the individual and recognised the new role of curatorship under the reformed Civil Code.

Banking significance

The judgment reinforces the proposition that financial support arrangements must be individually tailored.

A bank therefore needs to determine the actual powers contained in the relevant measure instead of assuming that all curators possess identical financial authority.

16. Case 3 — STS 964/2022, 21 December 2022

Supreme Court, Civil Chamber
ECLI: ES:TS:2022:4791

This case concerned measures of support under the transition from the former incapacity system to the new framework.

The proceedings had included curatorship concerning personal and patrimonial matters, including assistance with complex decision-making.

The decision illustrates the need to identify the person's specific support needs rather than deriving legal restrictions merely from a diagnosis.

Banking significance

A medical condition does not by itself determine whether someone can:

• open an account;
• operate an existing account;
• make payments;
• invest money; or
• enter another financial transaction.

The legal support arrangement and the individual's concrete needs are crucial.

17. Case 4 — STS 66/2023, 23 January 2023

Supreme Court, Civil Chamber
ECLI: ES:TS:2023:1291

This decision also belongs to the Supreme Court's post-Law 8/2021 jurisprudence concerning curatorship and judicial support.

It reinforces the importance of applying the reformed legal model rather than automatically continuing the assumptions underlying the former incapacity regime.

Banking significance

Banks and financial administrators should distinguish between:

legal capacity

and

the practical need for assistance with particular decisions.

Support should address the second without unnecessarily eliminating the first.

18. Case 5 — STS 1143/2024, 18 September 2024

Supreme Court, Civil Chamber
ECLI: ES:TS:2024:4400

This case is particularly important for financial management.

The proceedings concerned the extent of curatorship and included questions relating to management of the person's assets.

The Supreme Court ultimately established assistance concerning complex acts of administration and disposition, requiring the curator's authorisation for their validity.

This demonstrates how narrowly support measures can be designed.

The person was not simply deprived of control over every financial activity.

Instead, enhanced support focused upon complex financial decisions.

Banking significance

This provides a useful model:

Routine transaction → potentially independent

Complex administration/disposition → curator's assistance where required

The exact result always depends upon the governing support measure.

19. Case 6 — STS 1449/2024, 4 November 2024

Supreme Court, Civil Chamber, Plenary Session
Appeal 9015/2023

This judgment addressed the relationship between preventive powers of attorney and judicial curatorship.

A general power had been granted before Law 8/2021 and contained a provision allowing it to continue if the principal later required support.

The Supreme Court concluded that a sufficient preventive power can operate as a voluntary support measure and that judicial curatorship should not automatically be added merely because the person now requires support.

The judgment also explains that voluntary support arrangements take priority where they are sufficient.

Banking significance

This is highly relevant to financial institutions.

A bank might encounter:

Account holder → preventive attorney → financial transaction

rather than:

Account holder → court-appointed curator → financial transaction.

Banks therefore need to distinguish carefully between judicial and voluntary sources of financial authority.

20. A Further Important Principle from STS 1449/2024

The case also demonstrates another significant point.

The Supreme Court explained that administrative recognition of disability or dependency serves purposes different from a judicial determination of what support is necessary for exercising legal capacity.

The relevant question is not simply the existence of a diagnosis or administrative disability percentage. The focus is on the specific support actually needed for exercising rights.

For banking law, this means that a disability certificate by itself should not be treated as equivalent to an order transferring control over someone's finances.

21. Financial Management Model After Law 8/2021

The modern Spanish approach can be represented as:

Customer's autonomy

↓

Determine whether support is actually necessary

↓

Check voluntary support arrangements

↓

Check de facto support where legally relevant

↓

Judicial curatorship where other measures are insufficient

↓

Assistance for specifically identified transactions

↓

Representative authority only exceptionally

↓

Judicial authorisation for specified major transactions

↓

Accounting, supervision and liability

This represents a substantial change from the traditional substitute-decision model.

22. Liability of the Curator

Financial management carries legal responsibility.

Article 294 provides that a curator is liable for damage caused through fault or negligence to the person receiving support.

Consequently, a curator who improperly manages investments, negligently dissipates assets or otherwise causes compensable financial damage may potentially face civil liability under the applicable requirements.

Judicial approval of accounts also does not necessarily eliminate every possible legal claim arising from the administration.

23. Banking Compliance Example

Suppose a Spanish bank customer has substantial savings and investments and is subject to a curatorship.

The customer asks to make an ordinary payment.

The bank should not automatically require the curator merely because curatorship exists.

Now suppose the customer seeks to undertake a complex disposal of assets.

If the judicial support measure states that complex administration or disposition requires the curator's assistance, the bank must take that limitation into account.

Finally, suppose the representative curator wants to mortgage real property belonging to the supported person.

Article 287 may require judicial authorisation for the transaction.

Thus:

different transaction → different legal analysis.

24. Relationship Between Banking Law and Civil Law

This subject is described as “banking law,” but many of the decisive rules originate in Spanish civil law.

Banking regulation determines how financial institutions operate, while civil law determines questions such as:

• who owns the assets;
• who possesses legal authority;
• whether support is required;
• what the curator may do;
• whether representation is authorised; and
• when judicial approval is necessary.

The bank must therefore integrate civil-law support measures into its account and transaction procedures.

25. Conclusion

Banking law and guardianship-related financial management in Spain changed fundamentally after Law 8/2021.

For adults, the central concept is no longer blanket judicial incapacity followed by ordinary guardianship. Instead, Spanish law emphasises supported decision-making, primarily through voluntary measures, de facto support and curatorship. Judicial measures must be necessary, proportionate and tailored to the person's concrete circumstances.

The six principal Supreme Court decisions discussed above—STS 589/2021, STS 706/2021, STS 964/2022, STS 66/2023, STS 1143/2024 and STS 1449/2024—illustrate the movement toward individualised support, preservation of autonomy, transaction-specific financial assistance and recognition of voluntary support arrangements.

For banking purposes, the most important practical rule is therefore:

A bank should determine the person's actual legal support arrangement and the authority applicable to the particular transaction, rather than assuming that disability or appointment of a curator automatically transfers complete financial control to another person.