The end of the quarter is approaching, and with it, one of the essential tasks for any freelancer or small business in Spain: filing the Form 303 (Modelo 303) for the quarterly VAT return. As of today, September 10, 2026, we're gearing up for the third-quarter declaration, due by October 20th. Preparing it correctly and in advance is key to avoiding errors and potential penalties.
Essential Documentation: The Foundation of Your Return
Before you even open the form on the Spanish Tax Agency (AEAT) website, it's crucial to have all your information organised. Your Form 303 is built from two main sources:
* Issued invoices log: This includes all invoices you've sent to clients during the quarter. From this, you'll get your output VAT (IVA repercutido).
* Received invoices and expenses log: This compiles all supplier invoices and receipts for deductible expenses. This will provide your input VAT (IVA soportado) that you can claim back.
Accuracy is paramount. Ensure every invoice meets the formal requirements and that you only include expenses directly related to your business activity.
The Future is Now: The Impact of VeriFactu on Form 303
While the current process relies on manually gathering this data, the tax landscape is undergoing a major digital transformation. The VeriFactu system, which will become mandatory for all companies from January 1, 2027, and for freelancers and micro-businesses from July 1, 2027, is set to change the game.
This new system will require the use of certified invoicing software that sends a record of each invoice to the AEAT almost in real-time. The advantage? In the medium term, preparing Form 303 could become much simpler, as the Tax Agency will already have the data automatically.
However, this transition requires planning. Adopting compliant software is imminent, and many businesses will need an ERP VeriFactu integration or to connect via a VeriFactu API. If you use desktop programs, migration will be a priority, figuring out how to import Factusol to VeriFactu or how to import Sage 50. The same applies to cloud solutions, where you'll need to plan how to import Holded into a VeriFactu system. Even those who currently use spreadsheets will have to find a way to import Excel to VeriFactu, as this method will no longer be valid for issuing invoices. To understand the deadlines and obligations in detail, you can check our **guide on VeriFactu 2027 deadlines**.
Prepare for a Stress-Free Transition
Preparing Form 303 remains a crucial quarterly task, but now with an eye on the future. Digitalisation is no longer an option; it's a fast-approaching requirement.
Getting ahead of the changes is the best strategy. Using invoicing software like Fakturia.es not only simplifies your current tax management but also ensures you will be fully compliant with VeriFactu regulations and the Anti-Fraud Law when the time comes, guaranteeing a smooth and surprise-free transition.