For any freelancer or SME in Spain, understanding the difference between tax domicile (`domicilio fiscal`) and business premises (`local afecto a la actividad`) is not a minor issue. Confusing these two concepts can lead to errors in your Personal Income Tax (IRPF) return, loss of significant deductions, and potential inquiries from the Spanish Tax Agency (AEAT). Let's clarify what each one is and, most importantly, how it affects your expense deductions.
What is a Tax Domicile?
Your tax domicile is essentially your official address in the eyes of the Tax Agency. According to Article 48 of the General Tax Law, it is the taxpayer's location for their dealings with the Administration.
- For freelancers (individuals): It usually coincides with their primary residence.
- For companies (SMEs): It is their registered office or the place where the management and direction of the business are centralized.
Its main function is administrative: it is the address to which the AEAT will send all its notifications and communications. It is crucial to keep it updated to avoid missing any important notices.
And What Are Business Premises?
This is where things get interesting for your taxes. The business premises are the physical space where you carry out your work. It can be a rented office, a workshop, a retail store, or, as is increasingly common, a part of your own home.
The key is that only expenses associated with these business premises are deductible for IRPF purposes.
Deducting expenses if you work from home
This is the scenario that generates the most questions. If you use part of your home for work, you can deduct certain expenses, but you must meet specific requirements and apply the correct proportionality:
1. You must have notified the Tax Agency: It is essential that when you registered as a freelancer using form 036 or 037, you informed the AEAT that part of your home is used for your activity, specifying the exact square meters. If you didn't, you cannot deduct these expenses. This is a critical step in the process of how to register as a freelancer step by step.
2. Homeownership costs: Expenses such as property tax (IBI), community fees, waste collection tax, or mortgage interest are deductible based on the percentage of the home's total area that is used for the business. For example, if you use a 20 m² room in a 100 m² apartment, you can deduct 20% of these costs.
3. Utility expenses: For electricity, water, gas, or internet, the rule is different. Since 2018, you can deduct 30% of the proportional share of these expenses. Using the previous example (20% of the home is used for business), you would calculate 20% of the bill, and then apply 30% to that result. That is the final amount you can deduct.
The importance of clear records
Keeping an impeccable record of your invoices and expenses is vital, not only to optimize your deductions but also to be prepared for new digitalization regulations. With the arrival of VeriFactu invoicing systems, which will be mandatory for companies from January 1, 2027, and for most freelancers from July 1, 2027, the traceability and accuracy of every accounting entry will be even more critical. You can find more information in our guide on VeriFactu 2027: Deadlines for Freelancers in Spain.
In summary, don't confuse your address for receiving notifications (tax domicile) with the space that allows you to save on taxes (business premises). A correct initial declaration and good control over your expenses are the foundation of healthy taxation for your business.