Banking Law and IFRS Implementation in the Spanish Banking Sector

1. Introduction

International Financial Reporting Standards, commonly known as IFRS or NIIF in Spain, form an essential part of the Spanish banking regulatory system. They determine how banks recognise, measure, present and disclose financial assets, loans, impairments, derivatives, liabilities, income and risks.

IFRS rules are particularly important to banks because their balance sheets consist mainly of financial instruments. A change in the classification or valuation of loans, securities or expected credit losses can materially affect:

• Reported profits and losses.
• Regulatory capital.
• Dividend capacity.
• Investor information.
• Supervisory intervention.
• Credit-loss provisions.
• Market confidence.
• Resolution and restructuring decisions.

Spain follows a dual framework. Listed banking groups prepare consolidated accounts under IFRS as adopted by the European Union, while Spanish accounting and supervisory rules—particularly Banco de España Circular 4/2017—govern individual accounts, regulatory reporting and areas specifically adapted to credit institutions.

2. Legal Basis for IFRS in Spain

A. EU IAS Regulation

Regulation (EC) No. 1606/2002 requires companies whose securities are admitted to trading on an EU-regulated market to prepare their consolidated financial statements using EU-endorsed IFRS.

Therefore, a Spanish listed banking group must use EU-adopted IFRS for its consolidated financial statements.

An IFRS issued by the International Accounting Standards Board does not automatically become legally binding in Spain. It must first be endorsed by the European Union through the prescribed endorsement procedure.

B. Spanish Commercial Law

Spanish banks remain subject to general company and accounting legislation, including:

• The Commercial Code.
• The Companies Act.
• The Spanish Accounting Act and implementing regulations.
• Statutory audit legislation.
• Securities-market legislation.
• Rules concerning directors’ responsibility for annual accounts.

Directors must prepare financial statements that provide a true and fair view of the bank’s assets, liabilities, financial position and results.

C. Banco de España Circular 4/2017

Circular 4/2017 is the central sector-specific accounting instrument for Spanish credit institutions. It regulates:

• Public financial statements.
• Confidential supervisory returns.
• Recognition and measurement rules.
• Credit-risk classification.
• Loan-loss allowances.
• Financial-statement formats.
• Consolidation.
• Disclosures.
• Submission of information to Banco de España.

The Circular was introduced principally to align Spanish banking accounting with IFRS 9 and IFRS 15 from 1 January 2018.

It has subsequently been amended to reflect changes in EU accounting law, supervisory reporting and banking practices. Circular 1/2025 introduced further updates, including amendments applicable from 1 January 2026.

3. Which Spanish Banks Must Apply IFRS?

Listed banking groups

Spanish banks whose securities trade on an EU-regulated market must apply EU-endorsed IFRS to their consolidated financial statements.

Examples include large Spanish listed banking groups.

Unlisted banking groups

Unlisted groups may be subject to Spanish accounting provisions and Banco de España rules. Depending on their legal structure and reporting position, some may elect or be required to use IFRS-compatible standards.

Individual financial statements

Even where consolidated statements are prepared under IFRS, the individual legal entity generally prepares accounts under the Spanish framework applicable to credit institutions.

Circular 4/2017 is closely aligned with EU-endorsed IFRS, but it is not simply a reproduction of every IFRS provision. It contains Spanish supervisory adaptations and detailed treatment of credit risk and financial reporting.

Branches of foreign banks

Spanish branches of foreign credit institutions must comply with applicable Banco de España reporting duties. The accounting treatment may depend on whether the parent institution is established in the EU, the regulatory status of the branch and the nature of the report.

4. IFRS 9 and Financial Instruments

IFRS 9 is the most important accounting standard for Spanish banks. It replaced the incurred-loss approach of IAS 39 with a forward-looking expected-credit-loss model.

Its three principal areas are:

1. Classification and measurement.
2. Expected credit losses.
3. Hedge accounting.

5. Classification and Measurement of Financial Assets

Under IFRS 9, a bank classifies a financial asset by examining:

• Its business model for managing the asset.
• Whether its contractual cash flows consist solely of payments of principal and interest—the SPPI test.

Amortised cost

A loan is normally measured at amortised cost when:

• The bank’s business model is to hold it to collect contractual cash flows; and
• The cash flows satisfy the SPPI test.

Most traditional customer loans fall within this category.

Fair value through other comprehensive income

A financial asset may be measured at fair value through other comprehensive income where the business model involves both collecting contractual cash flows and selling assets.

Changes in fair value are generally recognised in other comprehensive income, while impairment, interest and certain exchange effects enter profit or loss.

Fair value through profit or loss

Assets that do not qualify for the preceding categories are measured at fair value through profit or loss. This normally includes many trading assets, derivatives and instruments with contractual terms that fail the SPPI test.

Reclassification

Reclassification is allowed only when the bank genuinely changes its business model. A change in intention concerning individual assets is insufficient.

This prevents banks from reclassifying assets merely to avoid recognising losses.

6. Expected Credit Loss Model

Stage 1

When a financial asset is first recognised and has not suffered a significant increase in credit risk, the bank records an allowance equal to 12-month expected credit losses.

This does not mean losses expected only during the next twelve months. It represents the lifetime loss resulting from default events that are possible during that period.

Stage 2

If credit risk has increased significantly since initial recognition, the bank must recognise lifetime expected credit losses.

The assessment may consider:

• Increased probability of default.
• Payment arrears.
• Forbearance or restructuring.
• Adverse sector conditions.
• Reduction in collateral value.
• Deterioration in borrower performance.
• Macroeconomic forecasts.
• Changes in internal or external ratings.

A payment does not have to be in default before transfer to Stage 2.

Stage 3

A credit-impaired asset is placed in Stage 3. Lifetime losses continue to be recognised, and interest revenue is normally calculated using the net carrying amount rather than the gross amount.

Indicators include:

• Serious financial difficulty.
• Material arrears.
• Concessions caused by financial distress.
• Probable bankruptcy.
• Fraud.
• Enforcement against collateral.
• Other objective default indicators.

Forward-looking information

Banks must use reasonable and supportable economic information, including forecasts relating to:

• GDP.
• Unemployment.
• Interest rates.
• House prices.
• Inflation.
• Corporate defaults.
• Sector-specific risks.

Models must normally include more than one economic scenario, such as baseline, optimistic and adverse scenarios, weighted according to probability.

7. Management Overlays

Statistical models cannot capture every emerging risk. Spanish banks may therefore apply management overlays or post-model adjustments.

Overlays may address:

• Geopolitical instability.
• Energy-price shocks.
• Climate-related risks.
• Sudden interest-rate changes.
• Model limitations.
• Sector concentrations.
• Pandemic-related distortions.
• Incomplete historical data.

However, an overlay must not become an arbitrary reserve. The bank should document:

• The risk being addressed.
• The calculation method.
• Supporting evidence.
• Governance and approval.
• The relationship with existing model provisions.
• The conditions for release.
• Measures preventing double counting.

Banco de España and the European Central Bank may challenge overlays that are inadequately supported, excessively optimistic or used to smooth profits.

8. Relationship Between Accounting Provisions and Prudential Regulation

IFRS accounting provisions and regulatory-capital requirements serve different purposes.

IFRS seeks to provide useful financial information to investors and other users. Prudential regulation seeks to protect depositors and preserve financial stability.

A bank’s expected-credit-loss allowance affects accounting equity. Regulatory authorities may then make prudential adjustments when calculating:

• Common Equity Tier 1 capital.
• Additional Tier 1 capital.
• Total capital.
• Risk-weighted assets.
• Leverage ratios.
• Capital buffers.

Supervisory expected-loss calculations under the Capital Requirements Regulation may differ from IFRS 9 expected-credit-loss calculations. A bank cannot assume that compliance with IFRS automatically establishes compliance with prudential rules.

Supervisors may also require prudential backstops or capital deductions for insufficient coverage of non-performing exposures.

9. Other Important IFRS Standards

IFRS 7: Financial-instrument disclosures

Spanish banks must disclose information concerning:

• Credit risk.
• Market risk.
• Liquidity risk.
• Expected-credit-loss methods.
• Changes in loss allowances.
• Collateral.
• Concentration of risk.
• Loan modifications.
• Defaults.
• Hedge accounting.
• Fair-value measurements.

IFRS 13: Fair-value measurement

IFRS 13 governs valuation techniques and the fair-value hierarchy:

• Level 1: quoted prices in active markets.
• Level 2: observable inputs other than direct quoted prices.
• Level 3: significant unobservable inputs.

Level 3 valuations are particularly sensitive because they involve management judgment and model assumptions.

IFRS 15: Revenue

IFRS 15 governs revenue from contracts with customers, including certain service fees. However, interest and many financial-instrument fees fall within IFRS 9 rather than IFRS 15.

IFRS 16: Leases

Banks recognise most leases through a right-of-use asset and lease liability. This commonly affects branch offices, headquarters, data centres and equipment leases.

IAS 12: Income taxes

IAS 12 governs current and deferred taxes. Expected-credit-loss provisions may create differences between accounting and tax recognition.

IAS 19: Employee benefits

IAS 19 applies to pensions, post-employment benefits and other employee obligations.

IAS 36: Impairment of non-financial assets

IAS 36 applies to goodwill, investments in subsidiaries and other non-financial assets. Goodwill impairment is particularly important after bank mergers.

IFRS 3: Business combinations

IFRS 3 applies to bank acquisitions and mergers, requiring identification and fair valuation of acquired assets and liabilities and recognition of goodwill or bargain-purchase gains.

IFRS 17: Insurance contracts

Spanish banking groups with insurance subsidiaries must apply IFRS 17 to insurance contracts. This creates complex interactions between the banking and insurance components of financial conglomerates.

10. Governance Responsibilities

The board of directors has ultimate responsibility for reliable financial reporting.

A Spanish bank should maintain:

• A clear accounting-policy framework.
• Independent finance and risk functions.
• An effective audit committee.
• Internal controls over financial reporting.
• Model-validation procedures.
• Data-quality controls.
• Documented management judgments.
• Independent internal audit.
• External statutory audit.
• Processes for supervisory reporting.

Expected-credit-loss models require close cooperation between accounting, risk, economics, IT, audit and regulatory-capital teams.

Senior management cannot treat IFRS implementation as merely a technical accounting exercise because classification, staging and provisioning directly affect capital, lending strategy and market disclosures.

11. Supervisory and Enforcement Authorities

Banco de España

Banco de España issues accounting and reporting rules for credit institutions and monitors their implementation.

It may require:

• Additional information.
• Corrections to financial returns.
• Changes to reporting systems.
• Remediation of internal-control weaknesses.
• More conservative risk treatment.
• Administrative sanctions in serious cases.

European Central Bank

For significant Spanish institutions, the ECB acts as direct prudential supervisor under the Single Supervisory Mechanism.

The ECB reviews:

• Credit-risk classification.
• Provisioning.
• Model governance.
• Non-performing exposures.
• Internal controls.
• Capital effects.
• Consistency between accounting and prudential data.

CNMV

The CNMV supervises financial reporting by listed banks and securities issuers. It may examine annual reports, interim statements and market disclosures and require corrective or supplementary information.

ICAC

The Accounting and Auditing Institute deals with general Spanish accounting and statutory audit regulation.

External auditors

Banks must have their annual accounts audited. Auditors assess whether the financial statements comply with the applicable framework and provide a true and fair view.

An unqualified audit opinion does not transfer responsibility from the directors to the auditor.

12. Relevant Case Law

Direct litigation about the technical calculation of IFRS 9 expected credit losses is limited. Banking accounting disputes more commonly arise through claims concerning misleading accounts, prospectus liability, investor protection, audits, supervisory valuation or bank resolution.

Case 1: Spanish Supreme Court, Judgment 23/2016, 3 February 2016 — Bankia IPO

This case concerned a retail investor who acquired Bankia shares during its public offering. Bankia’s prospectus presented a financially solvent and profitable institution, but later reformulated accounts revealed a materially different financial condition.

The Supreme Court held that the information contained in the prospectus was essential to the investor’s consent. The substantial difference between the financial image originally presented and the later position justified annulment of the share subscription for mistake.

IFRS importance

The judgment demonstrates that financial statements and accounting information are legally operative representations. Misleading accounting data can invalidate investment contracts and produce civil liability even where the dispute is not framed as a direct action for breach of an accounting standard.

Case 2: Spanish Supreme Court, Judgment 24/2016, 3 February 2016 — Bankia IPO

The companion judgment also involved retail investors who subscribed for Bankia shares on the basis of the IPO prospectus.

The Court concluded that investors were entitled to rely on the bank’s published financial information. The accounts initially indicated profits and apparent solvency, whereas the subsequent restatement revealed severe losses.

IFRS importance

The judgment reinforces the duty to ensure that accounting figures included in an offering document provide a reliable picture of the issuer. Incorrect recognition, valuation or presentation can affect the validity of investment decisions and expose the bank to restitutionary claims.

Case 3: Spanish Supreme Court, Judgment 380/2016, 3 June 2016 — Bankia Securities

This judgment considered claims relating to the purchase of Bankia shares and the effect of inaccurate financial information.

The Court distinguished between legal remedies but continued to recognise the central importance of the financial information supplied to investors. A retail investor may reasonably rely on official accounts and a securities prospectus rather than performing an independent audit of the bank.

IFRS importance

The case supports the principle that compliance cannot be merely formal. Financial reports must communicate the bank’s actual economic condition. IFRS judgments and estimates must therefore be reasonable, supportable and properly disclosed.

Case 4: Spanish Supreme Court, Judgment 890/2021, 21 December 2021 — Bankia Prospectus Liability

This decision addressed liability associated with the acquisition of Bankia securities and the relationship between prospectus information and investor losses.

The Supreme Court examined whether an investor could rely on inaccurate public information and under what conditions liability could arise. The decision forms part of the broader Bankia jurisprudence concerning misleading financial statements and securities disclosures.

IFRS importance

The case illustrates that published accounts can generate liability beyond the original subscription process. The accuracy of financial reporting matters to both primary-market and secondary-market investors, subject to proof of reliance, causation and applicable statutory requirements.

Case 5: Spanish National Court, Criminal Chamber, Judgment 13/2020, 29 September 2020 — Bankia IPO Criminal Proceedings

The National Court acquitted the defendants charged in connection with Bankia’s IPO.

The court considered evidence that the offering process had been subject to extensive institutional supervision and that the financial information had been examined by auditors and regulatory bodies. It found that the criminal offences had not been proved to the required standard.

IFRS importance

The acquittal does not mean that inaccurate accounts can never create civil or regulatory liability. It shows the distinction between:

• Accounting error or disputed judgment.
• Civil liability for misleading information.
• Administrative infringement.
• Intentional criminal falsification.

Criminal conviction requires proof beyond reasonable doubt, including the necessary mental element. A questionable accounting estimate does not automatically constitute criminal false accounting.

Case 6: Court of Justice of the European Union, Banco Santander v J.A.C. and M.C.P.R., Case C-410/20, 5 May 2022

The case concerned Banco Popular shares that became worthless following the bank’s resolution and subsequent transfer to Banco Santander.

The Court held that the EU bank-resolution framework prevented certain former shareholders from bringing actions that would undermine the effects of the resolution, including some claims based on defective prospectus information.

IFRS importance

The case demonstrates that accounting and disclosure claims operate within the broader bank-resolution framework. Even where investors allege misleading financial information, resolution legislation may limit remedies to protect the finality and effectiveness of the resolution process.

Case 7: General Court of the European Union, Aeris Invest v Commission and SRB, Case T-628/17, 1 June 2022

A shareholder challenged measures connected with the resolution of Banco Popular.

The General Court examined whether the EU institutions had committed legal errors in adopting and approving the resolution scheme. The challenge was rejected.

IFRS importance

The case highlights the difference between accounting values, regulatory values and resolution valuations. IFRS financial statements are an important source of information, but resolution authorities may use specialised valuation methodologies designed to determine whether a bank is failing or likely to fail and what losses should be imposed.

Case 8: General Court of the European Union, Algebris and Anchorage v Commission, Case T-570/17, 1 June 2022

Investment funds challenged the Banco Popular resolution decision and alleged errors concerning valuation and procedural rights.

The General Court rejected the action. It confirmed the broad technical discretion available to resolution authorities when dealing with a rapidly deteriorating bank.

IFRS importance

The judgment confirms that IFRS balance-sheet values do not control every regulatory decision. Supervisors and resolution authorities may consider liquidity deterioration, funding conditions, market confidence and resolution-specific valuations in addition to published accounting equity.

13. Legal Consequences of IFRS Non-Compliance

A Spanish bank’s material failure to comply with applicable accounting requirements may produce several consequences.

Correction and restatement

The bank may have to:

• Correct its accounts.
• Restate comparative information.
• Publish supplementary disclosures.
• Amend regulatory returns.
• Recalculate capital ratios.

Administrative sanctions

Banco de España, the ECB or CNMV may impose supervisory measures or sanctions for materially inaccurate, incomplete or late information.

Directors’ liability

Directors may be liable where they approve accounts that do not provide a true and fair view, particularly if they acted intentionally or negligently.

Auditor liability

An auditor may face liability if a deficient audit causes identifiable loss. The claimant must ordinarily prove breach of professional duty, damage and causation.

Investor claims

Investors may seek annulment, restitution or damages where misleading financial statements or prospectuses affected their investment decisions.

Criminal liability

Deliberate falsification or concealment may lead to criminal proceedings. Criminal liability requires stronger proof than a civil or accounting claim.

14. Practical Implementation Challenges

Spanish banks face several continuing IFRS implementation difficulties:

• Determining significant increases in credit risk.
• Distinguishing temporary arrears from genuine deterioration.
• Incorporating uncertain economic forecasts.
• Validating probability-of-default and loss-given-default models.
• Accounting for loan modifications and refinancing.
• Avoiding delayed transfer from Stage 1 to Stage 2.
• Measuring collateral under stressed conditions.
• Controlling management overlays.
• Reconciling accounting and prudential data.
• Integrating climate and environmental risk.
• Accounting for variable-rate instruments.
• Maintaining reliable historical data.
• Explaining changes in expected-credit-loss allowances.
• Valuing illiquid Level 3 financial instruments.
• Applying accounting requirements consistently across international subsidiaries.

15. Compliance Framework for Spanish Banks

An effective IFRS compliance programme should include:

1. Board-approved accounting policies.
2. Regular review of new EU-endorsed standards.
3. Clear ownership of IFRS judgments.
4. Independent validation of expected-credit-loss models.
5. Reconciliation between finance and risk databases.
6. Controls over manual adjustments and overlays.
7. Scenario and sensitivity analysis.
8. Audit-committee review of material estimates.
9. Documentation of loan staging decisions.
10. Monitoring of non-performing and forborne exposures.
11. Reconciliation between accounting provisions and regulatory capital.
12. Testing of financial-reporting controls.
13. Accurate regulatory and market disclosures.
14. Prompt correction of identified errors.
15. Training for directors, finance teams and risk officers.

Conclusion

IFRS implementation in the Spanish banking sector operates through a combination of EU-endorsed IFRS, Spanish commercial law, securities regulation and Banco de España Circular 4/2017. IFRS 9 is the most significant standard because it determines the classification of financial instruments and requires forward-looking recognition of expected credit losses.

Spanish case law—especially the Bankia litigation—shows that banking accounts are not merely technical documents. Their accuracy can affect investor consent, civil liability, securities claims, supervisory action and public confidence. At the same time, the Banco Popular cases establish that accounting values must be distinguished from prudential and resolution valuations.

Accordingly, effective IFRS implementation requires more than formal compliance. Spanish banks must maintain reliable data, defensible models, prudent judgments, independent oversight and clear disclosures capable of presenting a true and fair view of their financial condition.