When is the best time to exchange dollars for euros in Spain? A 2026 guide
Planning a trip to Spain? Learn how to get the best USD to EUR exchange rate, avoid hidden bank fees, and use Wise to convert money at the real market rate.
Foreign income in Spain: what you need to declare
So, you’ve made the move to Spain, but you’re still receiving income from abroad—perhaps through remote work, international investments, or a foreign pension. Naturally, you’re wondering how this fits into the Spanish tax system.
The general rule is straightforward: if you are a tax resident in Spain, you must declare your worldwide income on your Spanish tax return. Before the paperwork feels overwhelming, let’s break it down step-by-step. We’ll also look at how a Wise account can help you manage international payments and save on exchange rates along the way.
Who needs to declare foreign income in Spain?
Essentially, if you are considered a Spanish tax resident, you are liable for tax on your global earnings. You generally fall into this category if:
- You spend more than 183 days of a calendar year in Spain.
- Your main economic activities or center of business interests are located here.
If you meet either of these criteria, you are required to pay Spanish taxes on your worldwide income. This applies whether you are working remotely for a company overseas, holding international investments, renting out a property in your home country, or receiving a foreign pension.¹
What types of foreign income must you declare in Spain?
As a tax resident, you are required to report almost all types of income, regardless of where it originates. This includes:
- Employment income: Salaries from remote work for foreign companies or invoices sent to international clients as a freelancer.
- Rental income: Profits from renting out real estate located outside of Spain.
- Investment earnings: Capital gains from the stock market, mutual funds, or dividends from foreign companies.
- Foreign pensions: Any pension payments received from abroad while living in Spain.
Additionally, don’t forget about other income sources such as inheritances, gifts, or capital gains from selling assets abroad.²
How to declare your income from abroad in Spain
When tax season arrives (typically between April and June), you must file your Spanish income tax return, known as the Declaración de la Renta. To do this, you use Form 100³ (Modelo 100), which is the standard document for reporting earnings to the Spanish Tax Agency (Agencia Tributaria).
There is another important requirement to keep in mind: Form 720 (Modelo 720). If you hold assets abroad—such as bank accounts, investments, or property—worth more than €50,000, you must file this informational return to notify the authorities of your holdings outside of Spain.⁴
What if you've already paid taxes abroad?
The good news is that you generally won't be taxed twice on the same income. Spain has Double Taxation Conventions (DTCs) with numerous countries to prevent this.⁵
Thanks to these treaties, you can usually claim a deduction on your Form 100 for taxes already paid in another country. Depending on the specific agreement, your foreign income may be exempt in Spain, or you may receive a tax credit to offset the amount already paid. Because rules vary by country, it is always wise to check the specific treaty between Spain and your home nation.
What happens if you don't declare foreign income in Spain?
Failing to declare foreign income can lead to significant complications. The Spanish Tax Agency (Hacienda) can review your tax returns for up to four years to identify undeclared funds.⁶ If they find discrepancies, the penalties are tiered based on the severity of the case:
- Minor offense: If the undeclared amount is under €3,000 and deemed an oversight, you could face a fine of 50% of the unpaid tax.
- Serious offense: For amounts over €3,000, or if there is evidence of intentional concealment, fines can range from 50% to 100%.
- Very serious offense: In cases categorized as tax fraud, fines can soar to 150%, and you may face legal action.
💡 The bottom line: It isn't worth the risk. The safest and most stress-free approach is to be transparent and declare everything from the start.
Manage your international payments in Spain with Wise
Managing money across borders can be a headache with traditional banks, which often charge high fees and offer poor exchange rates. If you regularly receive income from abroad, a Wise account offers a smarter, more cost-effective alternative.
Unlike traditional banks, Wise uses the mid-market exchange rate and keeps all fees transparent and upfront.
With a Wise account, you get local account details for over 8 currencies (including EUR, USD, and GBP). This allows you to receive your salary or pension like a local, hold various currencies, and either spend them using your Wise debit card or transfer them to your Spanish bank account. It’s faster, cheaper, and makes tracking your foreign income for tax purposes much simpler.
Sources:- Natural person resident in Spain
- Residents with income from abroad
- Form 100. Personal Income Tax
- Form 720. Declaration of assets and rights located abroad.
- Double Taxation Agreements: list and information
- General Tax Law
Last checked: April 17, 2026
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