The scene repeats itself. A US-based director is relocated to Madrid under a secondment contract, with clean equity, a reviewed reimbursement policy, Social Security registration within the window, and a well-formed application for the special regime of Article 93 LIRPF. The CFO is comfortable. US corporate counsel has signed off. No one in the room has heard of Article 9 of the Spanish Personal Income Tax Regulation.
Statutory basis
Two tax frameworks coexist over the same person the moment they become a Spanish tax resident. The first —at origin— is IRC §62 of the Internal Revenue Code and its build-out in Treasury Regulation §1.62-2. The second —at destination— is Law 35/2006 (LIRPF) together with its implementing regulation, Royal Decree 439/2007 (RIRPF), and in particular Article 9. The two frameworks do not translate into each other: each starts from different premises, defines what counts as an exempt reimbursement on its own logic, and demands different documentation. A correctly drafted Accountable Plan answers a US question; Spanish residence imposes a different question, under different rules.
What an Accountable Plan is, and what it solves
Under US federal tax law, an Accountable Plan is a formal expense reimbursement arrangement under which amounts paid by the employer to the employee sit outside the employee's gross income. Three requirements must be met cumulatively:
- Business connection — the expense answers a legitimate business purpose.
- Documentary substantiation — the employee evidences expense, purpose, date and amount.
- Return of excess — any advance that exceeds the substantiated amount is returned within a reasonable period.
When the three requirements hold, the reimbursement does not appear on the employee's W-2, and it is neither subject to FICA nor to federal income tax withholding. The architecture is elegant and US global-mobility teams apply it with discipline. The issue is not that the Accountable Plan is poorly designed: it is perfectly designed for the legal order that gave rise to it. What happens is that the legal order in question stops being the applicable one the moment the border is crossed.
How Spain treats employer reimbursements
The IRPF default rule is direct and not particularly accommodating: amounts paid by the employer to the employee are employment income. The taxable base absorbs them unless a specific norm takes them out. That specific norm is Article 9 RIRPF, and its perimeter is narrower than it first appears.
Article 9 RIRPF recognises three main categories of excepted amounts: subsistence allowances, travel expenses and accommodation expenses. Each category operates under regulatory daily caps and under specific evidentiary conditions. Amounts exceeding the regulatory cap —regardless of the origin compensation policy— are employment income, subject either to the general IRPF or, in the case of the inpatriate, to the Article 93 LIRPF rates.
Where the two frameworks collide
That said, the collision between the two systems is not a matter of bad faith or negligence. It happens because each framework asks different questions. IRC §62 asks about business purpose and return of excess; Article 9 RIRPF asks about an actual displacement from the habitual place of work, about documentary proof of that displacement, and about daily caps by destination —Spanish territory, EU or third country. A receipt that satisfies the Internal Revenue Service may fail the AEAT, and vice versa.
It follows that a literal import of the US Accountable Plan, signed off in its original form, opens three typical gaps: subsistence allowances above the Spanish regulatory cap, travel expenses not tied to a provable displacement from the work centre, and accommodation evidenced under US standards that fall short of Article 9 RIRPF requirements. Every gap is taxable income.
Interaction with the Beckham regime
The impact amplifies when the executive elects the special regime under Article 93 LIRPF. The flat 24% applies to Spanish-source income up to €600,000 per year; the excess bracket is taxed at 47%. Employment income paid by a Spanish employer —or by a foreign employer on a secondment basis— is treated as Spanish-source income in full while the regime is in force.
Which is why every euro of reclassified reimbursement lifts the 24% taxable base. A yearly item of €40,000 booked incorrectly translates into €9,600 of additional tax, before considering the erosion of the wealth perimeter that tracks with the regime. On profiles carrying dense international compensation packages —housing allowance, tax equalisation, cost of living adjustment, tuition reimbursement— the mislabelled aggregate may top €80,000 a year, delivering an incremental charge of €19,200.
The gap no one spots
The problem is jurisdictional, not professional. US counsel drafts the Accountable Plan with rigour and reviews it periodically —that is their jurisdiction and that is what they should do. Spanish tax advisers, in turn, tend to come in after the move, to file Form 149, to prepare the first Form 151 return or to handle a specific compliance query. They review what sits in front of them: Spanish payroll, Spanish-source income, withholding balances.
The Accountable Plan lives inside the US employment file. Unless someone actively asks for it —and knows both legal orders well enough to understand why it matters— it never enters the Spanish review dossier. That is the gap.
Typical collision: United States against Spain
The executive arrives with a clean W-2, a signed expense reimbursement policy, and receipts archived to US standards. They acquire Spanish tax residence by clearing the 183-day test or by anchoring the main core of their economic interests in Spain (Article 9 LIRPF, in the general rules). Against that backdrop, the natural next step is to cross-check every category of reimbursement against Article 9 RIRPF and its schedule of caps, not against IRC §62. Setting aside the formal coherence of the origin package, what follows is the operational adaptation: redesigning the reimbursement policy for Spain, fitting the caps to the regulatory ceiling, and requiring the payroll team to classify each line in a way that matches Form 190 and the inpatriate's annual return.
Review before the move
Before acquiring Spanish tax residence, any executive carrying an active Accountable Plan should verify four milestones:
- Confirmed US compliance — the starting point; the origin adviser has usually already audited this.
- Simultaneous fit with Article 9 RIRPF — review by a Spanish tax adviser of categories, daily caps, documentary standards, and treatment on Form 190.
- Operational alignment between US and Spanish payroll — how receipts are captured, how displacement is recorded, how advances are controlled and returned.
- Compatibility with the Beckham regime if it is going to be claimed —because the flat 24% amplifies the cost of every classification error on an already sizeable base.
Position of the firm
Our reading is that the Accountable Plan is not a problem: it is the correct answer to a US question. The problem emerges when it travels without review to a jurisdiction that asks different questions and operates under different rules. Cross-border relocation is not an administrative formality; it is the moment at which two regulatory frameworks converge on the same person, the same employer and the same pay structure. It follows that our standard engagement opens with a line-by-line reconciliation of the origin reimbursement policy against Article 9 RIRPF, continues with a category-by-category reclassification table for the first Spanish tax year, and closes with the contractual adjustments the employer must sign before the director's Social Security registration. If the structure does not fit cleanly in Spain, we say so before Form 149 is filed.