the most important boxes that should always be checked in your 2026 declaration

Tomorrow the 2025 Income campaign begins, and we will be able to present our declaration corresponding to the last fiscal year. Facing the draft can be somewhat chaotic, and that is why we are going to tell you which boxes should always be checked in your draftbefore presenting it. This will ensure that these key elements are correct.

Filing your income tax return is tedious, so many people access their draft and file it as is. But remember that the Treasury does not guarantee that everything is correct in the draft, and that It is your responsibility to review it. and make sure that the tax data are correct. If the Treasury detects that there is a mistake, you will have to pay a fine even if they were the ones who generated your draft.

Income from work and economic activities

If you work as an employeethat is, for a company, we will talk about work performance, and you have to make sure that everything you have earned throughout the past year appears: For that you must look at your payrolls, your payments to Social Security must appear, and correctly record all the personal income tax that has been deducted. The boxes for this are 3, 7, 8, 9, 10 and 11.

If you are self-employedthat is, if you are self-employed, then you will have to indicate the money you have invoiced and the expenses you want to deduct. For example, the contributions you have paid to Social Security, purchase of stock or other expenses related to your activity. In this case, you must review it in the boxes ranging from 171 to 180.

It is very important to be clear about withholdings that have been carried out on you during the past year, since they are on which the calculation of the income result depends. Check box 596 especially carefully if you work for a company, and boxes 599 and 609 if you are self-employed.

Returns on movable capital

This category includes the money your accounts have generated banking as well as any capital, shares you have or bonds. If you have made transactions of this type that have generated profits or losses, you must write them down in boxes 26 to 41. Meanwhile, personal income tax withholdings must be in box 597.

State deductions

It is very important not to forget to note in your declaration If you are entitled to any deductionhelp or compensation for having made donations, for having a rent or other things. Sometimes we approve the draft without looking at it and we may lose the right to receive more money back. These are the ones you should look at:

• Deductions for donations: from box 722 to 725.
• Deductions for renting the habitual residence: from box 715 to 720.
• Deductions for investment in a newly created company: from box 711 to 714.
• Deductions for investment in the habitual residence: from box 698 onwards.

Regional deductions

Each Autonomous Community also has its deductions exclusive, so it is advisable to find out about those in the province where you live. Here, each community has a specific number for this type of deductions, although they usually appear on the penultimate page of the declaration. Don’t forget to also check if you are entitled to any.

Income tax return result

Box 700 will tell you the result of your declaration de la Renta, so it is obviously important to know and understand it. But sometimes it is confusing, because the result is positive or negative. Here’s what each one means:

• positive result: You have to pay. This is the amount that you will have to pay to the Treasury in your return to regularize the last fiscal year.
• Negative result: It’s your turn to get paid. Last fiscal year you paid the Treasury more than you should, and therefore they will return the indicated amount of money.

In Xataka Basics | Income Guide 2025: calendar, previous steps and how to prepare for the 2026 declaration