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Tax Season 2026: Key Dates and Digital Tools Finalized in Spain, Mexico and the U.S.

Authorities are rolling out prefilled data and simulators and urging early electronic filing to reduce errors, penalties and refund delays.

Overview

  • Spain will release 2025 fiscal data on March 19, open online Renta filing on April 8, start phone assistance on May 6 and in‑office help on June 1, close the campaign on June 30 and cut off direct‑debit filings on June 25.
  • Spain’s Social Security reminds Ingreso Mínimo Vital recipients that filing is mandatory and that benefits can be suspended and sanctions applied if returns are not submitted.
  • Mexico’s SAT has activated a March simulator so taxpayers can verify preloaded income, deductions and withholdings before filing, with companies due by March 31 and individuals filing April 1–30.
  • In the United States, the IRS sets April 15, 2026 as the federal deadline and continues to promote e‑filing as its systems process millions of returns since late January.
  • Digital access requires secure credentials, including certificado digital, DNIe or Cl@ve in Spain and RFC and e.firma in Mexico, and officials advise reviewing prefilled data early to avoid last‑minute system congestion.