Being a freelancer in Spain involves tax management that, while routine, is full of nuances. A small oversight can lead to inquiries from the Tax Agency or even penalties. With September 2026 as our reference point, we are at a crucial moment of digital transition. Let's review the most common mistakes so you don't get caught off guard.
1. Mixing Personal and Business Expenses
This is the most classic mistake. Deducting your grocery shopping or the entire home internet bill when you only use a small percentage for your business is risky. The golden rule is: you can only deduct expenses directly and exclusively related to your economic activity. If an expense is mixed, you must be able to prove the percentage of professional use, which is not always easy.
2. Errors in VAT Returns
Value Added Tax (VAT), or IVA in Spanish, is a constant source of confusion. Applying the wrong VAT rate, failing to charge VAT when you should, or deducting VAT from non-deductible expenses are common errors. Remember to carefully check your issued and received invoices before filing your quarterly VAT return (Form 303).
3. Ignoring the Arrival of VeriFactu (The Big Mistake of 2026/2027)
Perhaps the most serious mistake you can make right now is not preparing for the VeriFactu system. Starting July 1, 2027, all freelancers and small businesses will be required to use billing software that complies with the Spanish Tax Agency (AEAT) requirements.
This means that invoicing with Excel or Word will no longer be legal. The transition is not automatic and requires planning. You need to think about how to migrate your current data. This process might involve tasks like planning to import Excel to VeriFactu, or if you use more complex programs, figuring out how to import from Factusol to a VeriFactu system or importing from Sage 50. For businesses with custom systems, the key will be VeriFactu ERP integration through a VeriFactu API or a VeriFactu gateway for existing software to ensure communication with the AEAT. For a detailed view of the deadlines, check our guide on the VeriFactu 2027: Deadlines for Freelancers in Spain.
4. Missing Tax Deadlines
The tax calendar for a sole trader is strict. Forgetting to file quarterly returns (like Form 130 for IRPF or Form 303 for VAT) or annual ones automatically leads to surcharges and penalties. Use a calendar or software that alerts you to deadlines. If you're still unsure about the system, we recommend starting with our fundamental guide: What is VeriFactu? Guide for Freelancers in Spain.
Avoiding these mistakes is easier with the right tools. Good invoicing software not only helps with your daily tasks but also prepares you for the future. Solutions like Fakturia.es are already adapted to the Anti-Fraud Law and VeriFactu, ensuring your business complies with regulations so you can focus on what truly matters: your work.