Form 100: Personal Income Tax

Form 100 is one of the most commonly used forms by individuals who have to submit their income tax returns in Spain. Income tax returns are an important part of the financial year for many people. It contains information about those who are obliged to pay taxes, details of their income, deductions and other related information. 

Filing form 100 can be a daunting task if you don’t understand the details involved and the process of it. This article will discuss what details must be included on Form 100, the deadlines for submitting it and all other information related to it.

What is the Form 100?

Form 100 is the form that must be filed for Personal Income Tax (IRPF) in Spain. It is a tax on an individual’s income in Spain. It is paid annually by all residents and non-residents who make money in Spain, either through investments or employment. 

This form has several functions:

  • Informative. With this document, the Tax Agency can compare the information collected with information from other tax forms in an attempt to strengthen the fight against fraud.
  • Tax payment adjustment. Form 100 is used to determine whether you have paid too much income tax (in which case you will get a refund) or too little (in which case you will have to pay it back).
  • Statistics: The Tax Agency collects valuable information to take into account the state of the Spanish economy.

Preparation and submission of Form 100

The filing period for Form 100 usually starts in April of each year, with a deadline to submit the taxes before June 30th (the 25th if you want to pay in direct debit). Forms must include all incomes earned during the previous year, including any salary received from working abroad as well as any dividends from stock dividends and other investments.

The following information must be taken into account when submitting Form 100:

  • Personal details, including living situation, marital status (if any dependents), and disability.
  • Information on income from employment.
  • Information on income from immovable and movable property.
  • Data on income from economic activity.
  • Deductions.

The Spanish government has set up different tax rates depending on the amount of income earned during the fiscal year; these vary from 19-45%. 

Furthermore, taxpayers may be eligible for deductions such as health insurance premiums and charitable donations that can reduce their taxable income.

This form can be filed in various ways:

  • Electronically;
  • By telephone;
  • In person at the offices of the Revenue Agency or at the offices of autonomous communities that have an agreement with the Revenue Agency.
  • At any office of an authorized cooperating institution (banks, savings banks or credit cooperatives). Submission at the offices of cooperating institutions is invalid if the refund is refused.
  • By registered letter to the tax office or administration of the taxpayer’s place of residence.
  • By appointment at the offices of the Tax Agency or other administrations or institutions cooperating in the preparation of the tax return.


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What happens if you do not make the declaration?

If you accidentally miss the deadline, you should be aware of the consequences. The amount of the penalty depends on whether you file your tax return voluntarily or the tax authorities ask you to do so. The time it will take you to rectify the fault is also a factor.

If you miss the deadline and realise yourself before the tax authorities ask you to do so, you will have to file your tax return late, and the tax authorities will impose an additional charge when the deadline for filing your tax return comes around. The penalty will be a fixed €100 in case the result of the declaration is not an amount to pay; and it will be a surcharge (and in some cases interest) from 1% to 15 % of the amount to pay, depending on how late you submit the form. 

If you file it after the deadline, and after you have been asked to do so by the tax authorities, you will be charged a fine of €200 in case the result of the declaration is not an amount to pay, and it will be a penalty of between 50% to 150% of the result to pay otherwise. 

If you receive a summons from the tax authorities for not filing a tax return, you must file it in order not to make things worse. 


In conclusion, filing Form 100 to pay personal income taxes in Spain is an important part of the country’s taxation system. It can be a complicated process, especially for those who are unfamiliar with the Spanish tax code or who have not filed taxes before. 

Fortunately, there are resources available to help you understand the process and make the right decisions when filing, like our tax advisors in Barcelona. Additionally, it is important to remember that filing on time and correctly can save you time and money in the long run.

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