The campaign of the income tax return The 2025 tax year is almost here. For this reason, although the tax return doesn't kick off until April 2nd, all taxpayers will be able to begin requesting their tax information from the Tax Agency starting March 19th. This advance provision of information allows employees to review all the data collected by the public agency, and if there are any errors, there is greater room for correction. It's also important to know the deadline for filing your tax return to avoid penalties or problems with the Tax Agency.