Tax Litigation

Tax residence disputes in Spain

Residence is defended through facts, consistency and a strategy that connects both jurisdictions.

Tax residence disputes arise when the Spanish Tax Agency considers that an individual should have filed as Spanish resident, when two countries claim residence at the same time or when the documented facts do not support the position taken. The consequences may span several years and affect worldwide income, wealth taxation, foreign-asset reporting and, in some cases, companies managed by the individual.

A residence defence cannot be reduced to days of presence. Spanish domestic law also considers the main base of activities or economic interests and contains a presumption linked to certain close family members. Where domestic rules create dual residence, an applicable tax treaty will commonly apply a sequence of tie-breaker criteria. Each element must be interpreted through reliable facts and in the context of the whole position.

Lullius builds the strategy around chronology. We review homes, travel, professional activity, investments, company functions, family relationships, tax filings and prior communications. We separate agreed facts from disputed issues and identify independent evidence that supports the account. We also test whether positions taken in the two countries are compatible and whether foreign advice addresses the same period and questions.

We represent clients through information requests, audits and investigations and continue through administrative claims and court proceedings where required. In double-tax cases, we coordinate foreign counsel and consider, under the applicable treaty and on the facts, how domestic remedies interact with the mutual agreement process between competent authorities.

Focused support

Defending tax residence

Early risk assessment

We identify years, taxes, jurisdictions and disputed facts, review filed positions and assess the potential consequences before setting the response strategy.

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Facts and procedure

Strategy

The account must be capable of proof. A diary, certificate or utility bill rarely resolves a residence dispute by itself. Persuasive evidence comes from the convergence of independent sources: immigration and tax records, transactions, contracts, communications, professional activity and family decisions. We test the reliability, timing and precise proposition supported by each document. We also identify gaps and inconsistencies before replying. Explaining a discrepancy early is generally better than allowing an authority to build an inference around it.
Two jurisdictions, one strategy. When both states claim residence, international coordination is essential. We compare domestic rules, treaty provisions and filed returns, work with local advisers to avoid incompatible submissions and document tax actually borne. Treaty dispute-resolution mechanisms may offer a path distinct from domestic appeals. Their availability, deadlines and relationship with other proceedings must be considered case by case; they do not automatically replace the defence in Spain.
Prevention remains the strongest defence. Many disputes develop before a move or during years in which life is divided between countries. A preventive review allows the individual to organise evidence, correct inconsistent compliance and understand the limits of the proposed position before an enquiry begins. If proceedings have already started, early action protects deadlines, preserves evidence and establishes one coordinating team. Consistency from the first response shapes every later stage.
Quantification is part of the strategy. A residence dispute can affect several categories of income, wealth taxation and information reporting over multiple years. We model scenarios separating principal tax, interest and potential penalties and review the mechanisms that may eliminate or correct double taxation. The numbers do not replace the legal analysis. They help identify the issues that matter most, assess the financial effect of each route and support informed decisions about evidence, corrective filings, administrative claims and litigation. Where information is incomplete, we state the assumptions and update the analysis as the file develops. The client can then see which variables may change the assessment and which records are most important in refining it. We also separate cash-flow exposure from the final legal outcome, including the possible need for payment, suspension or guarantees while the dispute continues. Where more than one procedural route remains available, the model is updated for timing, cost and practical constraints. It supports decisions without reducing a legal dispute to a single headline figure. The assessment evolves with the evidence.