Let’s explain to you how to prepare your cell phone for the income tax return what we will do in 2026. The campaign is called Income 2025 because although we make the declaration this year, what we are really going to do is account for the last fiscal year.
This way, in case you want to make the declaration on your mobile phone, you will know everything you need. It is not mandatory to make the declaration on your device, although you will have the option to receive, review and present your draft in case you consider that everything is fine.
Remember key dates
The first thing you have to do is not forget the dates on which you can make the declaration. For that, looking at the Income calendar 2025 You can see when you can request and submit your draft on both web and mobile.
These are the key dates this year:
- Income tax return online: You can do it from April 8 to June 30, 2026.
- Income tax return by phone: You can do it from May 6 to June 30, 2026.
- In-person income tax return: You can do it from June 1 to June 30, 2025.
Download the Tax Agency app
If you want to file your income tax return via mobile, you will need to download the Tax Agency app or AEAT. You have it available for Android on Google Play and for iOS in the App Storeand it’s totally free.
This app allows you to carry out various tax procedures, including the declaration. In fact, when you enter it you are going to have a specific section Rent. It is there where you will be able to access the draft to present the declaration, but you will also be able to see those from previous years and carry out other procedures related to the campaign.
Download your digital certificate
To identify yourself in the AEAT app and in many other official ones, as well as to make online transactions, one of the simplest methods is to use your digital certificateincluding the FNMT certificate and that of DNIe. Therefore, It is advisable to have your certificate on your mobile. For that, you have to request your digital certificateand if you already have it, save it in a folder.
But another much more comfortable alternative is install the app FNMT Digital Certificateavailable in the App Store for your iPhone and on Google Play for Android. This application will allow you to request your certificate if you do not have it, but it will also allow you to access the certificates that you have already requested and have them on hand.
Review tax data
The Treasury will create your draft income based on the data it has about you. And the best way to detect possible errors that you will later have to correct in the declaration is review tax data in advance. You will be able access your tax data from the browser.
To do this, you can now enter the website headquarters.agenciatributaria.gob.es/Sede/Renta.htmlfrom your computer or mobile browser. Once inside, click on the option Tax dataand log in with your digital certificate.
When you look at your tax data, you will be able to detect if there are some things that are wrong or that have not been included. These things will also be wrong in the draft of the Income Tax, that is, locating them before you will already know what things you should change when the time comes and you can streamline everything.
If you have questions, review the declaration
When the time comes, by requesting the draft declaration on your mobile you will have some summarized results. You will simply see if you have to pay or return. When you get to that screen, click on the declaration to enter the draft and see its data.
Here, it is important that you review all the data and that modify what you think is necessary before submitting the return. Keep in mind that even if it is a draft made by the Treasury, in the event that there is a failure, you will be the person fined and the one who will have to pay the fine. Take the time to check all the data.
Get your reference number
And finally, another thing that is useful is to know your Income reference number 2025. The reference number It has six digits, and is used to manage any of the services related to this Income campaign.
To see your reference number from your mobileyou must go to the Tax Agency application. In it, click the option to view your profile at the top right. When you enter your profile, the number will appear just below the box where your name is.
In Xataka Basics | FNMT digital certificate on your mobile: 8 uses that you can give it on your device for different procedures
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