Americans living in Spain can face an unusual banking challenge: maintaining access to US financial services while living permanently or for an extended period overseas.

US citizens remain subject to US tax obligations even when they live abroad, and US-based accounts can also be useful for investments, credit cards, loans and other financial services.

However, maintaining conventional US banking relationships from Spain is not always straightforward. Some institutions require customers to maintain a US residential address or phone number, while financial institutions outside the United States can face additional compliance requirements when serving US citizens.

One potential alternative is a US credit union with membership rules that allow Americans living overseas to join.

Why banking can be complicated for Americans abroad

US citizens living in Spain can encounter additional administrative requirements because of the Foreign Account Tax Compliance Act, or FATCA.

FATCA requires foreign financial institutions to report certain information concerning US account holders to US authorities. The additional compliance obligations can make some banks reluctant to serve American customers who live outside the United States.

This does not mean that Americans in Spain cannot have bank accounts in Spain. Rather, the issue is maintaining access to particular US financial services while living abroad.

Fintech services such as Wise and Revolut can provide options for holding and transferring money in different currencies, but they may not offer the full range of services associated with a traditional US financial institution.

What is a credit union?

Credit unions are member-owned financial cooperatives rather than conventional shareholder-owned banks.

They can provide many of the same services, including checking and savings accounts, credit cards, loans and investment-related products.

Several US credit unions were originally established to serve particular communities, including US military personnel and government employees stationed overseas. Some have subsequently expanded their membership eligibility through partner organisations.

The World Council of Credit Unions says credit unions and financial cooperatives form a large international sector, with approximately 420 million members across 93 countries according to its latest global statistics. That figure covers the worldwide movement and is not specific to Americans living in Spain.

State Department Federal Credit Union

The State Department Federal Credit Union, commonly known as SDFCU, was originally created for employees and contractors of the US Department of State and their families.

Its membership eligibility has since expanded.

The Local reports that Americans outside the United States can generally become eligible by joining one of SDFCU's partner organisations. One route mentioned is the American Consumer Council, which has a $15 membership fee.

SDFCU also offers online banking and, according to The Local, can send certain verification codes through WhatsApp, potentially addressing one of the practical problems faced by customers who no longer have a US telephone number.

The credit union offers checking and savings products as well as investment accounts and IRAs.

The rates reported by The Local at publication included a 4% APY share certificate and a 1.21% money-market rate. Financial rates can change, so prospective members should check the institution's current terms before opening an account.

Service Credit Union

Service Credit Union was established in 1957 at an Air Force base in New Hampshire.

It now has branches in New England and locations serving US military communities in Europe.

Although its historical membership base is connected to the military and Department of Defense, The Local reports that membership can also be available to members of the American Consumer Council.

The institution provides checking and savings accounts, loans and business banking services.

The Local reported that some of its accounts offered interest rates ranging from 0.15% APY on qualifying checking balances to 5% APY on the first $500 in a particular high-yield savings account. Again, these are rates cited at the time of publication and should not be treated as guaranteed long-term rates.

Alliant Federal Credit Union

Alliant Federal Credit Union has a different history.

Originally established as United Airlines Employees' Credit Union in Chicago in 1935, it has evolved into a predominantly digital institution.

According to The Local, Alliant is open to a broad membership base and offers checking, savings, credit cards, trusts and IRAs.

The publication reported savings rates of up to 3.35% APY for balances above $100,000 and share certificates ranging from 3.10% to 4.15% APY.

The exact requirements and rates can change, so these figures should be checked directly with the institution before making a financial decision.

United Nations Federal Credit Union

The United Nations Federal Credit Union has a narrower membership structure.

Founded in 1947 and headquartered in New York, UNFCU primarily serves UN employees, contractors and people connected to qualifying international organisations.

It therefore is not an option for every American living in Spain.

One distinctive feature is its ability to finance certain property purchases outside the United States. The Local reports that qualifying borrowers can obtain mortgages for homes outside the US, although the loans can have different terms and interest rates from standard US mortgages.

The credit union also offers conventional banking, savings, investment and credit-card products.

Navy Federal Credit Union

Navy Federal Credit Union is another institution primarily connected to the US military community.

It has a large international footprint, including a branch at the US Naval Station in Rota, Cádiz.

Membership is generally restricted to eligible members of the armed forces, Department of Defense personnel and qualifying family members.

This means that simply being an American resident of Spain does not automatically make someone eligible.

For people who do qualify, however, its physical presence in Spain can make it different from US institutions that operate entirely online.

Why eligibility matters

The biggest difference between these institutions is membership eligibility.

Some credit unions have broad eligibility through partner organisations, while others remain tied to specific employers, government agencies, military services or international organisations.

An American living in Madrid, Barcelona, Valencia, Málaga or elsewhere in Spain therefore cannot simply assume that any credit union listed for Americans abroad will accept them.

Potential members should check eligibility, account fees, minimum balances, overseas access, international transfers, telephone verification requirements and tax-reporting obligations before applying.

Credit unions do not replace Spanish banking

For Americans who live in Spain, a US credit union can potentially complement rather than replace a Spanish bank account.

A person living in Spain may need a Spanish or European account for rent, utilities, local direct debits, Spanish taxes and everyday euro transactions.

A US account, meanwhile, can be useful for US-dollar income, American credit cards, investments, US tax payments and other financial commitments in the United States.

The best arrangement therefore depends on the individual's circumstances, residency status, income sources and financial obligations in both countries.

US tax obligations still apply

Moving to Spain does not automatically remove a US citizen's US tax filing obligations.

Americans living abroad should therefore consider the interaction between US and Spanish tax rules before choosing how to structure their accounts and investments.

Credit unions can provide financial services, but they do not replace professional tax advice.

Anyone with significant assets, investments, business interests or accounts in both countries may need advice from professionals familiar with both US and Spanish tax systems.

An option for Americans struggling to maintain US accounts

Internationally accessible credit unions are not a universal solution, but they can provide another option for Americans who find that traditional US banks are difficult to maintain from Spain.

SDFCU, Service Credit Union, Alliant Federal Credit Union, UNFCU and Navy Federal each have different histories and membership requirements, and they are not interchangeable.

The important point for Americans living in Spain is that moving abroad does not necessarily mean giving up access to US-based financial services.

For some people, an eligible credit union may provide a practical bridge between their financial life in Spain and their continuing financial, tax or investment obligations in the United States.