An extensive summary of Spain's current tax regime.
"Tax rates. The general tax rate for residents and nonresidents that conduct business activities in Spain through a permanent establishment is 25%. However, an interim 28% rate applies for the 2015 tax year. Entities that earned (on a group basis) net revenue of less than EUR10 million in the immediately preceding tax year are also taxed at a rate of 25%, except for 2015 in which they are taxed at a rate of 25% on the tax base up to EUR300,000, and at a rate of 28% on the tax base exceeding this amount. The tax rate applicable to small and medium-sized enterprises with fewer than 25 employees that maintain or increase the number of employees and that have net revenues of less than EUR5 million is 25% in the 2015 and 2016 tax years."
Source: Ernst & Young