During last week’s video consultations, many U.S. clients based in Spain shared similar concerns regarding the practical side of tax compliance—particularly around documentation, filing requirements, and the process for completing both U.S. and Spanish obligations efficiently.

Below is a summary of the most frequently discussed topics.

1. Key Documents Required for Filing

One of the main concerns clients raised was what documentation is actually needed to complete their filings correctly.

For U.S. tax compliance, especially when preparing the Form 1040, the requirements are often simpler than expected. In most cases:

• A copy of the Spanish IRPF return (Modelo 100), along with the copy of the “datos fiscales” is sufficient
• There is no need to provide pay slips or bank statements

This clarification helps reduce unnecessary paperwork and reassures clients who often assume that extensive documentation will be required.

However, accuracy remains essential and having a complete and final version of the Spanish return is critical to ensure proper reporting and coordination between both tax systems.

2. FBAR Filing: Additional Data Requirements

Another recurring topic was the FBAR (FinCEN Form 114), which requires U.S. persons to report foreign financial accounts.

To complete the FBAR, clients must provide:

• Bank account details (account numbers, institutions, etc.)
• Maximum balances during the year

Importantly, clients were reminded that the FBAR is a separate filing from the tax return, with its own requirements.

To simplify the process, we discussed the use of an Excel template, which allows clients to organize their account information clearly and efficiently. This approach significantly reduces errors and speeds up preparation.

3. Importance of Prior-Year Tax Returns

In several cases, we emphasized the need to provide:

• The previous year’s Spanish tax return (IRPF)
• The 2024 U.S. tax return

These documents are particularly useful for ensuring consistency and completeness, especially when preparing filings like the FBAR or reviewing carryovers and prior reporting positions.

Clients often underestimate how important prior-year information is, but it plays a key role in maintaining compliance and avoiding discrepancies.

4. Electronic Filing Authorization

Another practical requirement discussed was the need for a signed authorization document to proceed with electronic filing.

Before submitting U.S. tax returns on behalf of a client, professionals must have proper authorization in place. This step ensures:

• Compliance with IRS regulations
• Protection of the taxpayer’s information
• A clear audit trail for submissions

While straightforward, clients sometimes overlook this step, which can delay the filing process if not handled in advance.

5. Simplifying the Process Through Organization

A consistent theme across all calls was the desire to streamline and simplify the tax filing process.

Clients are increasingly looking for clarity on:

• What is strictly necessary
• What can be omitted
• How to organize information efficiently

By focusing on essential documents (such as the IRPF return), using structured templates (like Excel for FBAR data), and understanding the role of each filing requirement, the overall process becomes far more manageable.

Final Thoughts

Last week’s conversations made it clear that many challenges faced by U.S. expats in Spain are not just technical—but also procedural. Knowing exactly what to provide, when, and why can significantly reduce stress and improve accuracy.

With the right guidance and preparation, tax compliance can shift from being a complex burden to a well-structured and predictable process.

If you would like assistance with your filings, you can schedule a free, no-obligation consultation here:
https://outlook.office365.com/book/USTaxConsultants1@ustaxconsultants.net/?ismsaljsauthenabled=trueAntonio Rodriguez
US Tax Consultants
Tel: +34 915 194 392