The Basque Country's tax system is one of the most distinctive in Spain. Founded on the Economic Agreement (Concierto Económico) — an instrument with statutory force (Ley 12/2002) and constitutional recognition — it gives the Foral Deputations (Diputaciones Forales) of Bizkaia, Gipuzkoa and Álava the right to regulate, collect and audit their own taxes, independently of the State Tax Agency (AEAT). For companies and individuals with activity in the Basque Country, this tax autonomy creates both opportunities and complexities that require specialist advice.
This guide explains the main differences between the Basque foral regime and the common Spanish regime, the foral income tax and Corporation Tax rates, how the Economic Agreement works and when specialist foral tax advice is essential.
The Economic Agreement: foundation of the Basque tax system
The Economic Agreement is not a tax privilege, though it is sometimes perceived as such from outside the Basque Country. It is a fiscal co-ordination system between the State and the Basque foral institutions, recognising the tax competence of the Foral Deputations as a historical right — recognised in the First Additional Provision of the 1978 Constitution and in the Basque Autonomy Statute (Ley Orgánica 3/1979).
Under the Economic Agreement, the Foral Deputations of Bizkaia, Gipuzkoa and Álava:
- Regulate through Normas Forales (which have the force of law within their territory) the concerted taxes: income tax (IRPF), Corporation Tax (IS), Wealth Tax, Inheritance and Gift Tax, Property Transfer Tax and Stamp Duty, and Non-Resident Income Tax.
- Collect those taxes and retain a portion to fund their own devolved competences.
- Transfer to the State the “cupo vasco”, which compensates for State services not assumed by the Basque Autonomous Community (defence, foreign relations, historical debt).
VAT is a special case: the Foral Deputation collects VAT within its territory but shares it with the State in the proportions set out in the Economic Agreement.
Foral income tax: 2026 rate structure
The three Basque foral territories have their own income tax scales, with rates and bands that differ from both the State IRPF scale and the IRPF as supplemented by common-regime autonomous communities.
Main structural differences:
Higher minimum rates, similar or slightly higher maximum rates. The opening rate of the general foral income tax scale is 23% (in Bizkaia and Gipuzkoa), compared with 19% in the common regime. However, the effective tax burden may be lower than the common regime for upper-middle-income earners, thanks to a more generous foral deduction system.
Key foral deductions:
- Home purchase deduction: the Basque Country retains the deduction for investment in a primary residence for purchases made before 2013, and has introduced updated deductions for new purchases under specific conditions.
- Pension contribution deductions: foral limits differ from the common regime and may be more favourable for certain income profiles.
- Business activity deductions: particularly relevant for sole traders and business owners.
Foral Wealth Tax: the Basque Country maintains Wealth Tax in all three territories, with exempt thresholds and rates that differ from the national model. This has specific implications for high-net-worth individuals who relocate to the Basque Country.
Foral Corporation Tax: advantages and particularities
Foral Corporation Tax is one of the areas with the greatest differences from common-regime IS, and one of the most relevant for business location decisions:
Foral IS rate: The standard Corporation Tax rate in the Basque Country is 24% in Bizkaia, Gipuzkoa and Álava, compared with 25% in the common regime. The difference in the headline rate is small, but the foral deduction system widens the gap significantly in terms of effective rates.
R&D&I investment deductions: The Basque Country has one of the most generous R&D&I deduction systems in Spain:
- R&D deduction: up to 35% of current-year expenditure and 60% of the excess over the two-year average (in Bizkaia).
- Technological innovation deduction: up to 15% of expenditure.
- Deduction for advanced software research and development.
Job creation deduction: The Foral Treasuries provide specific deductions for net permanent job creation within their territories, with amounts varying by territory and year.
Special Investment Reserve (Reserva Especial para Inversiones): The foral regime allows a special reserve to be constituted from profits, the contributions to which are tax-deductible, provided they are materialised in productive investments within the foral territory within the prescribed periods. This mechanism can significantly reduce the effective IS rate for companies with high profits that are planning investments.
Connection points: when to pay tax to the Foral Treasury
The “connection point” (punto de conexión) concept determines which tax authority a taxpayer or company must account to. It is the most technically complex element of the Economic Agreement and the one that generates the most disputes.
For income tax (IRPF): An individual pays under foral IRPF if their habitual residence is in the Basque Country. Habitual residence is determined by the same criteria as Art. 9 LIRPF (primarily the 183-day permanence criterion).
For Corporation Tax: The rules are more complex and depend on the company’s turnover:
- Companies with turnover below €10 million: pay exclusively to the Foral Treasury if their registered office is in the Basque Country; exclusively to the AEAT if their office is in common-regime territory.
- Companies with turnover between €10 million and €7 billion: pay on a split basis between the Foral Treasury and the AEAT, in proportion to the percentage of transactions in each territory. This requires calculating a “Basque Country tax percentage” and filing returns with both administrations.
- Tax groups: groups using fiscal consolidation have specific joint taxation rules that may alter the individual connection points.
Practical implication: a company based in Bilbao (Bizkaia) that sells throughout Spain must determine what percentage of its transactions takes place in the Basque Country. If that percentage is, say, 30%, it will pay 30% of IS to the Foral Treasury of Bizkaia and 70% to the AEAT.
Tax planning in the Basque Country: real opportunities
The foral regime offers legitimate tax planning opportunities that merit analysis:
Relocating an individual’s tax domicile. For taxpayers with income above €300,000 per year derived primarily from business activities in the Basque Country, relocating tax domicile to Bizkaia, Gipuzkoa or Álava may be neutral or slightly advantageous versus the common IRPF rate in communities with high marginal rates. The analysis must consider effective marginal rates, applicable deductions and foral Wealth Tax.
Business succession and wealth transfer. Foral Inheritance Tax is one of the most favourable in Spain for transfers in the direct line. For business families with assets in the Basque Country, planning succession under the foral regime can generate very significant tax savings compared with other regions.
Location of R&D activities. The foral R&D&I deductions are more generous than those in the common regime. For technology or industrial companies planning innovation investments, locating in the Basque Country may be financially material.
When you need a specialist foral tax adviser
Specialist foral tax advice is essential in the following situations:
- Companies operating simultaneously in the Basque Country and common-regime territory that exceed or approach the €10 million turnover threshold.
- Individuals relocating their residence to the Basque Country, or who are assessing whether foral taxation is advantageous for them.
- Corporate groups with entities in different territories: fiscal consolidation, transfer pricing and intra-group dividends have specific foral implications.
- Companies wishing to access foral R&D&I deductions or the Special Investment Reserve.
- Succession planning involving assets located in the Basque Country.
- Disputes with the Foral Treasuries: inspection procedures, appeals to the Tribunal Económico-Administrativo Foral (TEAF) or judicial review before the Basque Country’s Superior Court of Justice.
At BMC we have a team specialised in Basque foral taxation, working in coordination with our tax planning and international tax teams.
Are you operating in the Basque Country or evaluating a business or personal location decision? Contact our team for a no-cost analysis of the foral regime implications for your specific situation.
