Being a freelancer in Spain comes with great responsibility, and tax management is one of the areas most prone to errors that can lead to inquiries and penalties from the Tax Agency. As tax experts, we have identified the most common mistakes so you can anticipate them and ensure compliance.
1. Incorrectly Deducting Expenses
This is the most classic mistake. Many sole traders mix personal and professional expenses or try to deduct items that are not 100% related to their business activity. Remember:
* Receipts vs. Invoices: To deduct VAT, you always need a full invoice (`factura completa`). A simple receipt (`ticket` or `factura simplificada`) is only valid for deducting the expense from your income tax (IRPF), not the input VAT.
* Business-Related: Any deducted expense must be directly and exclusively linked to your business. Expenses like groceries or personal clothing (unless it's a specific professional uniform) are not deductible.
2. Errors in VAT Returns
Managing the quarterly VAT return (Form 303) is a minefield. The most frequent errors include:
* Applying the wrong VAT rate (standard, reduced, or super-reduced).
* Deducting VAT from expenses not related to the business activity or from purchases under special schemes (like the `recargo de equivalencia`).
* Failing to file returns on time, which results in surcharges and late payment interest.
3. Ignoring the Arrival of VeriFactu and Electronic Invoicing
With the current reference date (September 2026), one of the biggest mistakes is not planning for the mandatory digital transition. The VeriFactu system, which requires the use of certified invoicing software, will be mandatory for freelancers and micro-enterprises from July 1, 2027.
Ignoring this change is a serious error. The transition involves choosing suitable software and planning data migration. For many, this will be a technical challenge, as processes like importing Excel to VeriFactu or migrating from desktop programs will require specific tools. The transition from systems like Factusol, Sage 50, or Holded (importing Factusol to VeriFactu, importing Sage 50, importing Holded) must be managed in advance. For developers or companies with proprietary systems, the key will be ERP VeriFactu integration through a VeriFactu API or a VeriFactu gateway for software. You can check the full timeline in our guide on VeriFactu 2027: Deadlines for Freelancers in Spain.
4. Not Keeping an Updated Record of Income and Expenses
Leaving your bookkeeping for the last day of the quarter is a recipe for disaster. Not maintaining an orderly, real-time record leads to forgotten items, lost invoices, and consequently, incorrect tax returns that can lead to audits and fines and penalties for not complying with VeriFactu in the future.
To avoid these and other errors, it is essential to have a robust invoicing system that is compliant with regulations. Software like Fakturia.es not only helps you manage your daily invoicing but also ensures compliance with the Anti-Fraud Law and the upcoming VeriFactu mandate.