How to Fill Out Modelo 145: A Comprehensive Guide

When it comes to tax obligations, it’s essential to understand the various forms and documents required by the tax authorities. In Spain, one such form is the Modelo 145, which plays a crucial role in determining the correct amount of income tax to be withheld from an employee’s salary. In this article, we will delve into the details of Modelo 145, explaining its purpose, how to fill it out correctly, and providing valuable insights to help you navigate this process smoothly.

Understanding Modelo 145

Modelo 145 is a tax form used in Spain to declare personal and family circumstances that may affect the calculation of an individual’s income tax. It is primarily used by employers to determine the correct amount of tax to withhold from an employee’s salary. By accurately completing this form, employees can ensure that the correct tax deductions are made, avoiding any potential discrepancies or penalties.

Purpose of Modelo 145

The main purpose of Modelo 145 is to gather information about an employee’s personal and family circumstances that may impact their income tax calculation. This includes details such as marital status, number of children, disabilities, and other relevant factors. By providing this information, employees can benefit from tax deductions and allowances that they are entitled to, ultimately reducing their tax liability.

Who Needs to Fill Out Modelo 145?

Modelo 145 must be completed by all employees in Spain who are subject to income tax withholding. This includes both Spanish residents and non-residents who earn income in Spain. It is important to note that even if an employee’s circumstances have not changed since the previous year, they are still required to submit a new Modelo 145 annually.

Filling Out Modelo 145: Step-by-Step Guide

Now that we understand the purpose and significance of Modelo 145, let’s dive into the step-by-step process of filling it out correctly:

Step 1: Obtain the Form

The first step is to obtain a copy of Modelo 145. This form can be downloaded from the official website of the Spanish Tax Agency (Agencia Tributaria) or obtained from your employer’s human resources department. Ensure that you have the latest version of the form to avoid any discrepancies.

Step 2: Personal Information

Start by providing your personal information, including your full name, tax identification number (NIF/NIE), and contact details. Double-check this information for accuracy, as any mistakes could lead to complications in the future.

Step 3: Marital Status

Indicate your marital status by selecting the appropriate option from the provided choices. The options typically include single, married, divorced, widowed, or separated. If you are married, you may need to provide your spouse’s information as well.

Step 4: Dependents

If you have any dependents, such as children or disabled family members, provide their details in this section. Include their names, dates of birth, and any relevant disabilities or special circumstances that may impact your tax calculation.

Step 5: Additional Deductions and Allowances

In this section, you can declare any additional deductions or allowances that you may be entitled to. This includes deductions for mortgage interest, rental expenses, contributions to pension plans, and other applicable deductions. Ensure that you have the necessary supporting documentation to validate these deductions.

Step 6: Sign and Submit

Once you have completed all the relevant sections of the form, review it carefully to ensure accuracy. Sign and date the form before submitting it to your employer or the appropriate tax authority. Keep a copy of the form for your records.

Common Questions about Modelo 145

Here are some common questions that individuals often have about Modelo 145:

1. Is it mandatory to fill out Modelo 145 every year?

Yes, it is mandatory to fill out Modelo 145 annually, even if your circumstances have not changed since the previous year.

2. Can I make changes to my submitted Modelo 145?

If you realize that you made a mistake or need to update your information after submitting Modelo 145, you should contact your employer or the tax authority immediately. They will guide you on the necessary steps to rectify the situation.

3. What happens if I don’t fill out Modelo 145?

Failing to fill out Modelo 145 can result in incorrect tax deductions from your salary, potentially leading to underpayment or overpayment of taxes. It is essential to comply with this requirement to ensure accurate tax withholding.

4. Can I claim deductions and allowances if I don’t fill out Modelo 145?

By not filling out Modelo 145, you may miss out on deductions and allowances that you are entitled to. This could result in a higher tax liability than necessary.

5. Can I seek professional assistance to fill out Modelo 145?

Yes, if you are unsure about how to fill out Modelo 145 or have complex circumstances, it is advisable to seek professional assistance from a tax advisor or accountant. They can guide you through the process and ensure that you maximize your tax benefits.


Modelo 145 is a crucial form in the Spanish tax system, allowing employees to declare personal and family circumstances that impact their income tax calculation. By accurately filling out this form, individuals can ensure that the correct amount of tax is withheld from their salary, avoiding any potential discrepancies or penalties. Remember to obtain the latest version of the form, provide accurate personal information, declare dependents and additional deductions, and sign and submit the form on time. By following these steps and seeking professional assistance if needed, you can navigate the process of filling out Modelo 145 with confidence and ensure compliance with tax regulations.

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