Working for oneself in Spain requires complying with a series of mandatory administrative procedures before various public administrations. How to register as self-employed is the first step that any entrepreneur must take, and although the process may seem complex, it becomes considerably simpler if the exact steps to follow and the order in which they must be carried out are known.
The procedure for registering as self-employed has three fundamental pillars: the Tax Agency, the General Treasury of Social Security, and, in certain cases, local and regional administrations. The procedures must be carried out before starting economic activity, and it is possible to request them up to a maximum of 60 days in advance. If you have already started working for yourself without registering, you must communicate your situation, although this will be considered a late registration.
To be able to process how to register as self-employed, it is necessary to gather certain prior documentation. You must have the original National Identity Document and a photocopy, as well as the Social Security Card. In the case of foreigners without a DNI, a community NIE or the NIE along with a residence and self-employment work permit is required. You will also need to have clear the start date of the activity, the heading of the Economic Activities Tax, and the activity code according to the National Classification of Economic Activities.
First step: tax procedures at the Tax Agency
The first step when registering as self-employed is to process the registration at the State Agency for Tax Administration using form 036. This census declaration form is mandatory for any taxpayer who must comply with formal tax obligations. In this document, you must indicate your personal details, the start date of the activity, the heading of the Economic Activities Tax corresponding to your business, and the tax obligations derived.
It is important that the start date you indicate on form 036 is later than the date of the procedure, as you must allow time to complete the registration with Social Security. For example, if you plan to start activity on January 25, you must submit form 036 before that date, indicating January 25 as the registration date. This procedure can be done electronically through the electronic headquarters of the Tax Agency, making it more accessible and agile.
From February 3, 2025, form 036 includes new obligations. A section is added to communicate the real ownership of legal entities and entities in the Census of taxpayers, as well as a box to request the rehabilitation of the tax identification number if necessary. These modifications affect everyone who carries out this procedure from that date onwards.
Second step: registration with Social Security
After processing the registration with the Tax Agency, the next step is to submit the registration with the General Treasury of Social Security in the Special Regime for Self-Employed Workers using form TA0521. In this form, you must include your Social Security affiliation number or contribution account number, the CNAE code of the activity you are going to carry out, the heading of the IAE, and the start date of the activity that you already indicated to the Tax Agency.
You must also specify the address of the professional activity, your contact details, and, very importantly, you must make a forecast of annual net earnings. This estimate is crucial because it determines the contribution base you will choose. The contribution base directly conditions the amount of the monthly fee you will have to pay and, in turn, the level of benefits you will receive if you need to access them in the future. There is flexibility in this decision: you can update the contribution base up to six times throughout the year to adjust it to your actual income.
During the procedure, you must also choose the collaborating mutual society that will cover your work risks, including contingencies for occupational illness, work accidents, and temporary incapacity. This has been an obligation since 2007 for all self-employed workers. In addition, you will need to provide the details of a bank account where your monthly self-employed fees will be domiciled.
As with form 036, the registration with Social Security can be done electronically through the electronic headquarters of the General Treasury of Social Security. In fact, from October 1, all self-employed workers are required to manage electronically the procedures related to affiliation, contributions, and collection of fees, as well as to receive notifications and communications from this agency.
Requirements and important considerations
To be able to register as self-employed in Spain, you must meet certain legal requirements. You must be at least 18 years old, be a Spanish resident in Spanish territory or a foreigner with a work permit. The activity you are going to carry out must be economic, performed personally and habitually, regardless of the income it generates. There is no minimum legal capital required to be self-employed, but you must keep in mind that you assume unlimited civil liability: you are responsible with all your assets for the debts you may incur.
You are subject to the payment of the Personal Income Tax and must comply with all tax obligations derived from your activity. If you carry out several economic activities on your own, you only need to register once, although you must communicate all activities in the corresponding forms.
Monthly fee and calculation of earnings
Upon registering as self-employed, you are obliged to pay a monthly fee to Social Security. The amount is calculated based on the chosen contribution base, which in turn is based on the forecast of annual earnings. To determine this estimate, you must consider the net earnings from all economic activities you carry out as a self-employed worker, plus the amount of the fees paid to Social Security.
The calculation of net earnings is carried out according to the regulations of the Personal Income Tax. To these earnings, as long as you have been registered in the special self-employed regime for 90 days, a deduction for generic expenses of 7% is applied, a percentage that is reduced to 3% in the case of commercial partners. This deduction automatically recognizes certain expenses without the need for justification.
Other complementary procedures
Depending on the type of activity and the commercial establishment, complementary procedures may be necessary. If you are going to have a commercial premises, you must obtain the Opening License from the corresponding Town Hall, as well as the Works License if it is necessary to carry out renovations. You must also communicate the opening, installation, or expansion of the workplace to the Labour Authority of your Autonomous Community, which depends on the Ministry of Labour or Employment.
Depending on the type of activity you are going to develop, you may need to apply for specific licenses that vary according to the autonomous community and municipality. It is recommended to start these procedures with enough time to avoid unnecessary delays in the opening of the business.
Where to process: electronic headquarters and PAE Points
All procedures to register as self-employed can be carried out electronically through the electronic headquarters of the Tax Agency and the General Treasury of Social Security. This allows you to complete the process from anywhere with an internet connection, using a digital certificate.
There is also the option to go in person to the Entrepreneur Attention Points, which are responsible for facilitating the creation of new companies and providing information and documentation processing services. These points, which are usually managed completely free of charge, can be very helpful in resolving specific doubts or completing the procedures if you prefer in-person assistance.
Several self-employed organizations, such as the Association of Self-Employed Workers, offer specialized advice to guide this process and ensure that all legal requirements are met correctly and to avoid losing potential benefits, such as the discounts of the Flat Rate of 80 euros per month during the first months of activity.
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