What is Double Taxation?

Double taxation occurs when the same income is taxed twice — once in the source country and once in the country of residence. Without protection, a British national in Mijas receiving a UK pension could face tax on it in both countries. Double Taxation Treaties (DTTs) prevent this by allocating taxing rights between the two countries.

Spain's Double Taxation Treaty Network

Spain has over 90 DTTs in force. The most relevant for Costa del Sol residents include:

  • Spain-UK (1975, amended): Covers pensions, employment income, dividends, interest, and capital gains.
  • Spain-Germany: Covers all common income types; important for German-speaking expats.
  • Spain-Netherlands, Belgium, Sweden, Denmark, Norway: Relevant for Scandinavian and Benelux expats.
  • Spain-USA: Relevant for US citizens resident in Spain — particularly complex as the US taxes citizens on worldwide income regardless of residency.
  • Spain-France, Spain-Italy: Relevant for French and Italian nationals.

How DTTs Work: Exemption vs Credit Methods

DTTs eliminate double taxation using one of two main methods:

  • Exemption method: Certain income is taxed only in one country — the treaty allocates exclusive taxing rights. Government pensions are often taxed only in the paying country.
  • Credit method: Income is taxed in both countries, but Spain allows you to deduct the tax paid abroad from your Spanish bill. You pay the higher of the two rates, but never both in full.

UK-Spain Treaty: Key Income Allocations

For British nationals resident in Spain:

  • UK government/civil service pensions (NHS, armed forces, police, teachers): Taxed only in the UK — not subject to Spanish IRPF.
  • UK state pension and private/company pensions: Taxed in Spain only. You must apply to HMRC for gross payment and declare it in your Spanish IRPF return.
  • UK rental income: The UK may tax at source; Spain also taxes it. You claim a credit in Spain for UK tax paid.
  • UK dividends: UK can withhold up to 15%. Spain taxes the dividends and allows credit for UK withholding.
  • Employment income from UK employer: Generally taxed in Spain if habitually resident and working here.

Practical Steps

To benefit from DTT provisions:

  1. Obtain a Spanish tax residency certificate (certificado de residencia fiscal) from the AEAT.
  2. Submit it to the source country's tax authority (e.g., HMRC) to claim exemption or reduced withholding.
  3. Declare all worldwide income in your Spanish IRPF return, claiming double taxation credit for taxes paid abroad.
  4. File any required returns in the source country.

The interaction between two tax systems is complex and depends on specific treaty provisions and your personal circumstances. Always work with a tax advisor familiar with both systems.

Frequently Asked Questions

Under the Spain-UK DTT, UK state pension income is taxable in Spain (country of residence) not the UK. Inform HMRC of your Spanish residency so your pension is paid gross without UK tax deducted. You declare and pay Spanish IRPF on it. Note: UK government pensions (civil service, NHS, armed forces, police, teachers) are taxed only in the UK regardless of where you live.
Request a certificado de residencia fiscal online from the AEAT website using your NIE and digital certificate or Cl@ve PIN. The AEAT typically issues it within a few days. Submit it to the foreign tax authority to claim treaty benefits.
If there is no DTT, Spain's domestic IRPF law includes unilateral relief provisions allowing a credit for taxes paid abroad — limited to the Spanish tax that would have been due on that income. Some level of double taxation may still occur. Your tax advisor can quantify the impact.