Spain tax returns reveal widespread errors, low‑income workers miss €340 deduction

A review by Laborai, a platform that combines artificial intelligence with human oversight, found that seven out of ten Spanish income‑tax returns contain mistakes or omitted deductions, often leading taxpayers to overpay by an average of €600‑€800. Founder Said warned that accepting the tax draft without review is “the main error.”

Separately, the Spanish Tax Agency offers a little‑known IRPF deduction of up to €340 for workers earning €16,576 or less in 2025. The benefit tapers off for incomes up to €18,276, and the deduction cannot exceed the taxpayer’s total tax charge. Legal expert Andrés Millán explained the eligibility thresholds and reminded that the deduction applies only to employment income, not pensions or other earnings.