Over the past decade, Spain’s autonomous communities have increasingly wielded their decentralized tax powers to craft more competitive economic environments, transforming the nation’s fiscal landscape. The 10th edition of the Regional Tax Competitiveness Index (RTCI) reveals a growing divergence across the country’s territories. While proactive regions have systematically modernized their tax codes to attract entrepreneurs, investors, and new residents, others have maintained static policies or increased levies, causing them to slip behind their neighbors.
By 2026, this ongoing competition has completely redrawn Spain’s economic map. Several territories that once languished at the bottom of the rankings have successfully engineered dramatic turnarounds, while previously stable jurisdictions have lost ground due to legislative inertia or uncompetitive tax structures.
The Biggest Winners: Reformers That Climbed the Ranking
The most remarkable success stories of the past decade belong to Extremadura and Andalusia, both of which implemented deliberate, sustained reform agendas to overhaul their regional fiscal standing.
No territory improved more between 2017 and 2026 than Extremadura. Over the decade, the region climbed an impressive 11 positions, surging from 19th to 8th place while boosting its overall index score by 1.43 points. This structural transformation stemmed from a consistent strategy of easing the tax burden on families and local businesses.
Extremadura’s fiscal shift began with the introduction of a 99 percent inheritance tax rebate for close relatives, a policy that significantly reduced the cost of intergenerational wealth transfers. The reform momentum accelerated dramatically in 2023 when the regional government approved a full wealth tax exemption, instantly positioning Extremadura among the most competitive jurisdictions in the country for high-net-worth individuals.
Concurrently, regional authorities lowered personal income tax rates, particularly targeting lower- and middle-income earners. Further legislative changes introduced in 2026 expanded inheritance tax relief to include nephews and nieces under specific circumstances. Together, these measures completely redefined Extremadura’s fiscal competitiveness, elevating it from a laggard to a top-tier regional economy.
Andalusia achieved the second-largest improvement in the country, climbing from 16th position in 2017 to 7th place by 2026. Its score rose by 1.13 points, driven by a comprehensive strategy designed to foster economic dynamism and investment.
Andalusia pursued sweeping reforms across multiple tax categories, combining successive reductions in personal income tax rates with the indexation of tax brackets and allowances. This indexing mechanism helped shield taxpayers from the silent tax increases associated with inflation and bracket creep.
In addition to income tax relief, Andalusia slashed its inheritance tax burden by introducing a 99 percent rebate coupled with a one-million-euro exemption threshold for close relatives. Wealth taxation was similarly overhauled through a targeted rebate mechanism linked to the national solidarity tax. Furthermore, the regional administration permanently reduced property transfer taxes and stamp duties, effectively dismantling the barriers that had long made Andalusia one of Spain’s least attractive fiscal jurisdictions.
Other regions also capitalised on fiscal reform to gain momentum. Murcia climbed five positions to reach 9th place in 2026, propelled by policies that eased inheritance levies, trimmed personal income tax rates, and relaxed wealth tax pressures.
The Valencian Community pursued a more volatile trajectory. After losing significant ground following tax increases introduced between 2021 and 2022, the region changed course to revive its economic appeal. In 2026, it climbed two positions after enacting a corrective package that lowered income tax rates, raised the wealth tax exemption threshold, trimmed property transfer and stamp duties, and expanded inheritance tax relief. These adjustments signal a renewed political commitment to fiscal competitiveness after a period of policy deterioration.
The Biggest Losers: Regions That Failed to Keep Up
Conversely, regions that resisted tax modernization or maintained punitive levies experienced clear economic and fiscal consequences, illustrating that policy inaction can be just as damaging as active tax hikes.
Castilla-La Mancha recorded the steepest decline in the national ranking, tumbling from 8th place in 2017 down to 16th by 2026. As neighboring communities modernized their fiscal frameworks and lowered burdens to attract talent and capital, Castilla-La Mancha stood still, steadily losing its competitive edge.
Asturias suffered a similar fate, sliding from 13th to 18th position. Although the regional government attempted to introduce corrective reforms in 2025 and 2026, these policy shifts arrived too late to offset a decade of stagnation. Consequently, Asturias remains one of the weakest performers in the country, particularly within inheritance taxation, where it stands out as one of the least competitive jurisdictions in Spain.
Navarre’s standing also eroded over the 10-year span, dropping five places to 12th position by 2026. Although targeted adjustments improved income tax treatment for lower-income residents, earlier policy decisions regarding inheritance and wealth taxes severely undermined the region’s overall score. Navarre continues to rank dead last in the wealth tax component of the index, creating a persistent drag on its macroeconomic performance.
Catalonia remains entrenched at the bottom of the index, holding 19th place in 2026 with a score of 4.45. This enduring placement is driven by several compounding factors. The region maintains comparatively high marginal income tax rates, imposes one of the heaviest wealth tax burdens in the nation, and levies steep fees on property transfers.
Compounding these pressures, Catalonia collects 11 regional own taxes—roughly twice as many as most other autonomous communities. While political leaders have occasionally introduced localized reforms, these measures have failed to counteract the accumulated weight of past tax hikes or meaningfully improve the region’s structural standing.
The Leaders: Madrid and the Basque Provinces
The upper echelon of the index remains firmly anchored by Madrid and the three Basque provinces, which continue to set the benchmark for fiscal efficiency. Madrid remains the undisputed leader, anchored by a long-standing commitment to low taxation, broad tax bases, and administrative simplicity.
Madrid has eliminated all regional own taxes, enacted a complete wealth tax rebate aligned with the national solidarity tax, maintained a highly competitive inheritance tax framework, and repeatedly lowered personal income tax rates while indexing brackets against inflation.
Madrid’s dominance is starkly illustrated by its score of 7.12 in 2026, giving it a 0.35-point lead over Biscay, a 0.38-point advantage over Álava, and a 0.52-point cushion over Guipúzcoa. The gap widens dramatically when compared to lower-performing territories; Madrid outperforms Catalonia by an extraordinary 2.67 points, highlighting the massive structural divergence separating Spain’s most and least competitive regional economies.
A Crowded Upper-Middle Tier in 2026
A defining feature of the 2026 index is the high concentration of regions occupying the upper-middle tier, specifically between 5th and 10th place, where score margins are exceptionally tight.
The Canary Islands rank 5th with 6.38 points, closely followed by La Rioja at 6.36, Andalusia at 6.31, Extremadura at 6.26, Murcia at 6.19, and Cantabria at 6.18. Only 0.20 points separate the 5th and 10th positions, meaning that even minor policy tweaks could trigger notable shifts in future rankings.
A distinct demarcation appears immediately below this cluster. While a mere 0.20 points divide the top six regions of this tier, the gap between Cantabria in 10th place and the Balearic Islands in 11th widens to 0.21 points, establishing the boundary of the upper-middle group.
Regions spanning from the Balearic Islands down to Castilla-La Mancha in 16th place are separated by a cumulative spread of 0.36 points, indicating a high degree of convergence and comparable levels of fiscal competitiveness across these territories.
Below Castilla-La Mancha, however, the fiscal floor drops noticeably. Although Castilla-La Mancha ranks 16th, it maintains a clear 0.60-point buffer over the bottom-tier jurisdictions, underscoring a sharp divide between the middle-lower tier and the least competitive territories.
Ultimately, the 2026 RTCI data illustrates a heavily segmented national economy. At the summit, Madrid and the Basque provinces command a decisive advantage. Below them sits a densely packed upper-middle tier running from the Canary Islands to Cantabria, followed by a middle-lower tier of six regions. Finally, a lagging group anchored by Aragon, Asturias, and Catalonia remains significantly detached from the national average, leaving a visible chasm between Spain’s modernizing fiscal mainstream and its stagnant jurisdictions.
