Hi Tourist,
If you have allowances for family and mortgage, for all I know you could be right that income tax is comparable to the UK. But if you don’t have such allowances, I don’t see it. Of course it all depends on what you earn, but for someone with a pension of say ?8000 or more and some savings, they will pay more tax in Spain. However I would be delighted to be proved wrong and would love to know of a good Gestoria who can bring my tax bill down to a UK type level! No one I know can do it. For a start off the amount you are allowed to earn before you pay tax is a is a lot less in Spain than in the UK.