how to look at them on your PC or your mobile before making the declaration this 2026

Let’s explain to you how to access and review your tax dataso that you have the option of checking that the information that the Treasury has about your last fiscal year is correct. Because the declaration we make in 2026 corresponds to the last fiscal year, and that is why the campaign claims to be that of 2025.

This is one of the most important previous steps of the Income calendar 2025and it is vital that you review it before accessing the draft. In fact, we’ll start by reminding you why tax data is so importantand then we will tell you how to access them.

What are your tax data for?

The tax data is the information that the Treasury has about you. In this information you will find everything from basic information such as your name and home address to more advanced information on everything related to your taxation. You will be able to see information about your open bank accounts, your personal capital, your capital gains, the donations you make during the year, what job you have and what your salary is, or your Social Security contributions.

These are the data that the Treasury uses to generate your draft for the income tax return. If you see that everything is fine in the draft, you will be able to present it directly when it can begin to be generated in April.

But these drafts are not made by a person, but are generated automatically. And there is always the possibility that the Treasury incorrectly collects some data in its databases.

If your draft has incorrect data and you present it it will be wrongand this will mean that if the Treasury detects it you will receive a fine. This is true even if the draft is generated by the Tax Agency itself, because it is your responsibility to review the tax data and the draft and make the necessary corrections.

That’s why It is important that the data is up to date and that they are all correct. And that is why this step is also vital before filing the declaration, because by making sure that your tax information is correct you will then be able to file the declaration much faster from the draft.

You will not be able to modify the tax data with this procedurewhich is purely informative. The data They are only modified after generating the Income draft. Of course, you will be able to use them for things like taking tests in the Income Simulator.

But doing this preliminary work You will already have located the errors to change them later when you have the draft. This way, all the verifications you have to carry out can be done beforehand, and when you receive the draft the process of changing everything will be much faster.

How to see your tax data on the web

To access your tax data through the browser, you must enter the Income 2025 campaign website of the Tax Agency. Your address is headquarters.agenciatributaria.gob.es/Sede/Renta.html. in here, click on the option Tax data what’s in the box Featured actions that will appear at the top.

You will enter the page where you have to choose a method to identify yourself as a person in the tax agency. You will be able to do this using your digital certificateincluding the FNMT certificate and that of DNIethe PIN code and other Mobile Key methods, or the reference number. Use the method that is easiest for you.

After logging in, a window will be displayed where you have to indicate whether you are acting on your own behalf to obtain your own data, which is the option checked by default. You simply have to click on Confirmbut this is a step you must do so that those acting on behalf of other people can indicate it.

Now, first you will go to a screen where you can ratify your tax address. Your data will be seen and you will only have to click on Ratify or in Continue. This is so if you have changed homes.

And after finishing ratifying your address, you will go to the page where you can now see all your tax data. On this page, all you have to do is go reviewing them and looking for possible errors to check that everything is correct. And if there are errors, you will then have to knowingly rectify them in the draft of the Income Tax.

How to see your tax data on your mobile

You can also check your data in the Tax Agency appavailable for Android on Google Play and for iOS in the App Store. In it, after identifying yourself, click Rent from the main menu, and when you are inside click on the option Income 2025 that appears at the top, and is where you can make the arrangements for the declaration that you will make in 2026.

This will take you to a screen where you have the procedures available for the next Income campaign. In it, click on the option Tax data. By doing so, you will go directly to the screen where you can ratify your tax address and then access all your tax data.

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