Spanish transport companies face strict payroll documentation rules after the nation’s high court clarified that per diem allowances do not automatically escape social security contributions simply by carrying that label on a pay slip. According to a ruling issued by the Tribunal Supremo on July 21, 2025, employers must actively prove that drivers undertook real work-related travel to keep maintenance and lodging expenses exempt from taxation.
The high court’s decision addresses a dispute in which the Tesorería General de la Seguridad Social originally demanded more than 108,000 euros in unpaid contributions from a transport operator over several years.
Proving the Trip Over Individual Receipts
According to the Tribunal Supremo ruling, employers must separate two frequently confused concepts: proving that a business trip actually happened versus proving what a worker spent on every single meal. When a transport company demonstrates a legitimate work-related transit, the absence of an individual restaurant receipt does not automatically convert a tax-free per diem into taxable salary.
The Sala de lo Contencioso-Administrativo ruled that routine operational records can replace individual tickets, provided they build a coherent paper trail. Under the Reglamento del IRPF, payers must verify the exact date, location, and professional reason for a journey. For trucking fleets, that evidentiary burden is routinely met using digital tachograph downloads, driver card records, transport waybills, delivery notes, load orders, and fleet management software.
Regulatory Exemptions and Per Diem Limits
The rules governing tax-exempt allowances depend heavily on whether a trip involves overnight stays and whether the travel occurs domestically or internationally. Article 9 of the Reglamento del IRPF sets clear financial thresholds that dictate when maintenance and lodging payments remain free from extra social security withholdings.
When a driver stays overnight on a domestic route, the maximum exempt maintenance allowance is 53.34 euros per day, rising to 91.35 euros daily for international journeys. For trips without an overnight stay, the limits drop to 26.67 euros within Spain and 48.08 euros abroad. For lodging specifically, freight transport operators benefit from a specialized exception allowing daily accommodation expenses up to 15 euros domestically and 25 euros internationally without requiring individual hotel invoices. Any amounts paid above these regulatory ceilings immediately trigger social security contributions.
Fleet Organization and Documentation Strategy
Transport companies frequently encounter tax inspections because their operational data remains siloed across different departments. To withstand audits by the Tesorería General de la Seguridad Social, human resources and payroll teams must coordinate directly with traffic management to link every single per diem payout to a verified vehicle movement.
An effective internal compliance system must systematically cross-reference driver identities, vehicle license plates, departure timestamps, arrival times, origins, destinations, and associated transport documents before finalizing monthly payroll. Uniform or fixed payments handed out regardless of whether a driver actually traveled will face immediate rejection by tax authorities, transforming routine travel expenses into costly retroactive salary assessments.
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