Budgeting App for Expats in Spain

Spain is one of the most popular destinations for expats worldwide, and for good reason. The climate, food, healthcare, and cost of living make it hard to beat. But the financial side of moving here catches a lot of people off guard.

Our founder Patrick moved from the US to Spain and ran into this firsthand. Suddenly he had a Chase account in dollars, a CaixaBank account in euros, and no budgeting app that could handle both. YNAB forced everything into one currency. PocketSmith worked but cost over $200 a year for the privilege. Spreadsheets lasted about three months before the formulas broke.

That experience is why Borderless Budget exists. If you're juggling EUR and USD (or GBP, or any other currency), this is the app we wished we'd had from day one.

Spain's banking system is modern and well-regulated, but opening your first account can feel like a bureaucratic maze. Here's what to expect.

Major banks for expats

• CaixaBank, Spain's largest retail bank after its merger with Bankia. Wide branch network, solid mobile app, and the most ATMs in the country. A popular choice for expats in Catalonia and across Spain.
• Santander, Global bank with a strong Spanish presence. Offers non-resident accounts, which makes it one of the easier options if you don't have a NIE yet.
• BBVA, Known for its excellent digital banking experience. The app is consistently rated as one of the best in Europe. Also offers non-resident accounts.
• Sabadell, Strong in the Valencia region and along the Mediterranean coast. Less international than Santander or BBVA, but solid for everyday banking.

What you'll need to open an account

Most banks require a NIE (your foreign identity number), passport, proof of address in Spain (an empadronamiento certificate from your local town hall), and a Spanish phone number. Some branches are more accommodating than others, if your Spanish is limited, BBVA and Santander tend to have English-speaking staff in larger cities.^[1]

Cash vs. card culture

Spain has shifted heavily toward card payments in recent years, especially in cities. But don't ditch cash entirely. Smaller shops, local markets, and some restaurants, particularly outside tourist areas, still prefer cash. Many landlords expect rent via bank transfer rather than direct debit.

Spain's cost of living varies dramatically by city. Here's a realistic monthly budget for a single expat, excluding rent:

For Americans, Spain typically works out to 25-40% cheaper than major US cities. Your dollar goes further here, though the exact impact depends on the EUR/USD exchange rate, which is why tracking spending in both currencies matters so much.

One thing that catches new arrivals off guard: seasonal electricity costs. Spanish apartments often lack central heating and air conditioning, so utility bills can swing from 60 EUR in spring to 200 EUR in August or January. Budget for it.

Spain uses the euro (EUR), which is the second most traded currency in the world. For American expats, the EUR/USD exchange rate directly affects how far your money goes, and it moves more than you'd expect.

Over the past five years, the EUR/USD rate has ranged from roughly 0.96 to 1.23. That's a 28% swing. If your US income is $5,000 per month, the difference between a strong and weak dollar could be over 1,000 EUR per month in purchasing power. That's not a rounding error. It's your rent.

Transferring money to Spain

Avoid your bank's international wire transfer. The fees are high and the exchange rates are poor. Instead, use a service built for international transfers:

• Wise, Transparent fees, mid-market exchange rate, fast transfers. The go-to for most expats.
• Revolut, Free currency exchange up to a monthly limit, with a small markup beyond that. Great for day-to-day spending with their card.
• OFX, Better for larger transfers like rent payments or moving savings. No transfer fees on amounts over $1,000.

Borderless Budget tracks all of your accounts, your US bank, your Spanish bank, and your Wise or Revolut account, in a single dashboard. Exchange rates update daily, so your budget always reflects where things actually stand.

Spain's tax system is progressive and fairly straightforward once you understand the basics. Here's what most expats need to know.

Tax residency: the 183-day rule

If you spend 183 or more days per year in Spain, you're a Spanish tax resident. This means you must declare your worldwide income to the Agencia Tributaria (Spain's tax authority). Spanish income tax rates range from 19% on the first 12,450 EUR to 47% on income above 300,000 EUR, with regional variations that can add a few percentage points.^[2]

The Beckham Law

Spain's Special Tax Regime for Inbound Workers (commonly called the Beckham Law) lets qualifying new residents pay a flat 24% tax rate on Spanish-source income for up to six years, rather than the standard progressive rates. If you're moving to Spain for work and haven't been a Spanish tax resident in the previous five years, this is worth investigating with a tax advisor.^[3]

Modelo 720: foreign asset reporting

This is the one that catches people off guard. If you hold foreign assets worth more than 50,000 EUR in any category (bank accounts, investments, or real estate), you must file a Modelo 720 declaration by March 31 each year. The penalties for late filing have been reduced following an EU court ruling, but it's still an obligation you shouldn't ignore.^[4]

Double taxation: US-Spain tax treaty

American expats are taxed on worldwide income by both the US and Spain. The US-Spain tax treaty and the Foreign Tax Credit (FTC) or Foreign Earned Income Exclusion (FEIE) help prevent double taxation, but you'll still need to file with both countries. A tax advisor who specializes in US-Spain cross-border taxes is worth the investment, at least for your first year.

After living in Spain and building a budgeting app, here are the things we've learned the hard way.

1. Budget in euros for local expenses, not dollars. Converting everything to USD in your head (or your app) distorts how much you're actually spending. Your Spanish groceries cost what they cost in euros. Budget them that way.
2. Track your "menu del dia" habit. Spain's lunch culture is wonderful, and sneaky. A 12-15 EUR daily lunch menu adds up to 250-300 EUR per month. It's a great deal, but only if it's in your budget.
3. Plan for annual expenses early. IBI (property tax), community fees, vehicle tax (IVTM), and your annual gestoria bill for tax filing all cluster around the same few months. Set aside money monthly so they don't hit all at once.
4. Watch the exchange rate before large transfers. If you're transferring USD to EUR regularly, even a 2% rate difference on a $3,000 transfer is 60 EUR. Use Wise's rate alerts to time your transfers when the rate is favorable.
5. Budget for trips home. Flights to the US from Spain typically cost 400-800 EUR depending on the season and how far in advance you book. If you go home once or twice a year, that's a meaningful budget category.
6. Keep a cash buffer for the unexpected. Spanish bureaucracy sometimes requires cash payments or bank transfers with specific timing. Having a buffer in your Spanish account prevents last-minute scrambles to transfer money from abroad.
7. Don't forget your autonomo payments. If you're self-employed in Spain, the monthly autonomo social security contribution (from 230 EUR for new registrants, scaling up based on income) is a fixed cost that's easy to overlook when setting up your budget.^[5]

We built Borderless Budget in Spain, for expats in Spain. Here's what that looks like in practice.

Connect your Spanish and home-country banks

Link your CaixaBank, Santander, BBVA, or Sabadell account alongside your US, UK, or other home-country bank. Transactions from all accounts sync automatically into one dashboard. No manual entry, no CSV imports, no switching between apps.

Budget in EUR and your home currency

Your budget is set in your home currency, and Borderless Budget automatically converts every transaction, whether it's your Madrid rent in euros or your US student loan in dollars. You can toggle any transaction to see the original currency amount. Exchange rates update daily, so your budget always reflects reality.

Automatic categorization

Transactions from Spanish merchants are automatically categorized, your Mercadona run goes to groceries, your Renfe ticket goes to transport, your Endesa bill goes to utilities. Categorization improves as you use the app, learning your patterns across both currencies, so you spend less time sorting transactions and more time living your life in Spain.

See the impact of exchange rates

When the EUR/USD rate shifts, your combined budget view updates automatically. You'll see exactly how currency movements affect your overall spending, no surprises, no guesswork.