Transfer Pricing in Spain: Related-Party Transaction Compliance

Spain's transfer pricing regime is governed by Article 18 of the Corporate Income Tax Act (Ley del Impuesto sobre Sociedades, LIS). Article 18 establishes the fundamental rule: transactions between related parties must be valued at the price that independent parties would have agreed under comparable circumstances — the arm's length principle. Spain's rules are explicitly aligned with the OECD Transfer Pricing Guidelines, which the AEAT (the Spanish tax authority) treats as an authoritative interpretive source.

The transfer pricing rules apply not only to transactions between Spanish companies and their foreign affiliates, but also to transactions between Spanish entities within the same group, and to transactions between a Spanish company and its individual shareholders, directors or their family members. The rules apply regardless of whether the transaction crosses a border.

Who Is a "Related Party" Under Spanish Law?

Article 18 LIS defines related parties broadly. The key relationships include:

• A company and its shareholders or partners holding a direct or indirect participation of 25% or more in the capital or voting rights
• Two companies where a third entity holds 25% or more in each
• A company and its directors, administrators or members of the board — regardless of ownership percentage
• A company and close family members (up to third degree of kinship) of any person in the above categories
• Two companies that are part of the same group under Article 42 of the Spanish Commercial Code (Código de Comercio)
• A company and a permanent establishment of that company in another country

The 25% threshold means that minority shareholders just below this level are technically outside the strict related-party rules, but the AEAT may still scrutinise transactions with significant minority shareholders if there are signs of income shifting.

Intragroup Services: Management Fees and Royalties

Management fees charged by foreign holding companies to Spanish subsidiaries, and royalty payments for the use of intellectual property owned by group entities, are among the most frequently audited intercompany transactions. The AEAT's position is that management fees must reflect genuine services actually provided, and that the charge must be calculated using an arm's-length method. A charge that is a round-number percentage of revenue with no supporting cost analysis is extremely vulnerable on audit. Similarly, royalties for IP that was originally developed in Spain and transferred to a low-tax jurisdiction are subject to intense scrutiny, particularly under the OECD's post-BEPS guidance on profit attribution to intangible assets.

Thin Capitalisation and Interest on Intercompany Loans

While Spain abolished its formal thin capitalisation rules in 2012, interest on related-party loans must still be priced at arm's length under Article 18 LIS. The AEAT benchmarks intercompany interest rates against comparable third-party lending conditions. Excessive interest charges — or, conversely, interest-free loans from a Spanish parent to a foreign subsidiary — are both potential audit triggers. Additionally, Article 16 LIS limits the deductibility of net financial expenses to 30% of operating profit (EBITDA), which limits the overall tax benefit of intercompany debt regardless of the pricing question.

Master File and Local File: Documentation Obligations

Spain requires two-tier transfer pricing documentation for corporate groups with a consolidated turnover exceeding €45 million in the preceding tax year. The documentation consists of:

• Master File (Documentación del Grupo): Group-level information covering the group's organisational structure, business description, intangible assets, intercompany financial activities and the group's financial and tax positions. Must be prepared at group level and provided by the Spanish entity on AEAT request.
• Local File (Documentación del Obligado Tributario): Entity-specific documentation covering the Spanish taxpayer's structure, description of controlled transactions, the method selected and why it was chosen, comparability analysis, and the arm's-length result. Must be prepared annually for each relevant transaction category.
• Country-by-Country Report (CbCR): Spanish parent entities of multinational groups with consolidated revenue exceeding €750 million must file a CbCR with the AEAT. Non-Spanish multinationals with Spanish subsidiaries may also face secondary filing obligations.

Below the €45 million threshold, full documentation is not mandatory, but the AEAT may still audit related-party transactions and taxpayers should be able to demonstrate arm's-length pricing on request. A simplified regime applies for groups below the threshold.

Advance Pricing Agreements (APAs) with the AEAT

An Advance Pricing Agreement (Acuerdo Previo de Valoración) is an agreement between the taxpayer and the AEAT — and potentially the tax authority of one or more other countries (a bilateral or multilateral APA) — that determines in advance the transfer pricing methodology to be applied to specific controlled transactions. APAs provide certainty and eliminate the risk of a transfer pricing adjustment on the covered transactions for the period of the agreement (typically three to five years, renewable).

APAs are particularly valuable for complex transactions involving unique intangibles, high-value intragroup services or unusual financing arrangements. The APA application process requires detailed economic analysis and is resource-intensive, but the certainty gained can significantly outweigh the cost for material intercompany transactions. Spain's APA regime is governed by Articles 91–93 of the General Tax Regulations (Reglamento General de las actuaciones y los procedimientos de gestión e inspección tributaria).

Transfer pricing penalties in Spain operate on two levels: penalties for substantive mispricing (where the transaction price is found to differ from the arm's length price) and penalties for documentation failures (where the required master file and local file are not maintained).

Substantive Adjustment Penalties

Where the AEAT makes a transfer pricing adjustment — i.e., it revalues a related-party transaction at the arm's length price — a penalty of 15% of the resulting tax adjustment applies, with a minimum of €15,000 per adjusted transaction category. This penalty is separate from the tax charge itself and from late payment interest. The penalty increases if the taxpayer cannot demonstrate that it applied a reasonable transfer pricing method in good faith.

Documentation Penalties

Separate penalties apply for failures in the documentation requirements. For taxpayers required to maintain the master file and local file, the penalty for each data item not provided, provided incorrectly, or provided out of time is €1,000 per item, up to €10,000 per tax period. Where the documentation failure relates to a transaction with a listed tax haven entity, these penalties are doubled. A specific penalty of 1% to 1.5% of the net operating income of the undocumented transaction applies in some cases.

Criminal Risk

Transfer pricing adjustments can, in principle, lead to criminal referral under Article 305 of the Penal Code where the total unpaid tax exceeds €120,000 per tax year. While criminal proceedings for transfer pricing cases are rare, they are not unknown — particularly in restructurings involving the transfer of high-value IP or customer relationships. The risk is highest where the documentation is absent or manifestly inadequate.