Copy of tax return filed on paper or other by another means other than online
If you filed your tax return on paper and cannot obtain a copy through the Tax Agency website, you can contact the corresponding Administration or Delegation to find out if they can provide you with a copy of your tax return. The addresses and telephone numbers of all Administrations and Delegations are published on the website, in the "Contact us" section located at the bottom of the page.
If it is an Income Tax return, you can request a tax certification of IRPF that contains all the Income Tax imputations that the Tax Agency knows about in a specific year.