What is Form 303 for Amazon FBA sellers in Spain?
Form 303 is the standard Spanish VAT return. For Amazon FBA sellers, it is the form that captures domestic Spanish output VAT, certain intra-Community acquisitions, and deductible input VAT. In practice, it is the main recurring VAT filing for a business established in Spain.
If you need the wider picture first, start with Spanish VAT for Amazon FBA Sellers: The Complete Guide. Form 303 only makes sense when you understand how it interacts with Form 369, Form 349 and Form 390.
Why Form 303 exists and how it differs from Form 369
Form 303 exists to settle Spanish VAT periodically. Form 369 exists to report Union OSS sales and does not replace Form 303. The practical rule is simple: Spanish VAT goes into Form 303; eligible B2C cross-border OSS sales go into Form 369.
The key boxes Amazon sellers usually care about
| Section | Reference boxes | Typical content |
|---|---|---|
| Output VAT | C01-C06 | domestic sales subject to Spanish VAT |
| Intra-Community acquisitions | C10-C11 | services or purchases from other EU businesses, such as Amazon Luxembourg fees |
| Deductible national VAT | C28-C29 | Spanish supplier invoices with recoverable VAT |
| Deductible VAT linked to intra-Community transactions | C36-C37 | self-assessed VAT that is also deductible |
The exact form layout should always be checked against the current AEAT version, but the core logic remains stable: separate output VAT, self-assessed intra-Community VAT, and deductible VAT.
A simple Amazon-style example
Imagine one quarter with domestic Spanish sales, Amazon Services Europe S.à r.l. fees from Luxembourg, and Amazon Ads invoices issued by Amazon Online Spain S.L. Domestic sales feed Spanish output VAT. Luxembourg fees usually require intra-Community service treatment. Spanish Ads invoices may generate normal domestic deductible VAT, assuming the expense is recoverable.
Common Form 303 mistakes
- Including OSS sales as if they were Spanish domestic sales.
- Ignoring Amazon Luxembourg fees or classifying them as normal domestic invoices.
- Forgetting the deductible side of reverse-charge-style self-assessment.
- Building the return from cash settlements without checking invoices and VAT reports.
- Leaving Q4 inconsistencies unresolved and creating problems for Form 390.
Step by step in the AEAT portal
- Access the Form 303 filing section in the AEAT portal.
- Choose the correct filing period.
- Input amounts by tax block, not by improvising from raw lines.
- Review output VAT, intra-Community acquisitions and deductions separately.
- Check the final result and keep the filing proof and working papers.
Frequently Asked Questions
Does Form 303 include OSS sales?
No. OSS sales should not normally be mixed into Form 303. They belong in Form 369 when they fall within OSS scope.
Do Amazon Luxembourg fees belong outside Form 303?
No. They are often one of the most important Form 303 adjustments because they can create intra-Community acquisition treatment and deductible VAT consequences.
Do I still need Form 390 if I file Form 303?
In many cases yes. Form 390 is the annual VAT summary and should reconcile with the four quarterly Forms 303. See Form 390 annual VAT summary Spain.
FBAtax removes the mechanical work from Form 303 preparation by separating Spanish sales, OSS sales, Amazon Luxembourg fees, and deductible VAT before you ever touch the AEAT form.
