The Spanish taxman do cometh. Anyone that is resident in Spain and gets a UK pension must declare it to the Spanish taxman. Spain wants the tax, you should not be paying tax in the UK, it should be paid in Spain and reclaimed from HMRC. Chances are if you only have the old age pension there will be nothing to pay as you have personal allowances, but it must be declared. Spain has put 'exceptional circumstances' to pensions, they are going back to 2010 - but by declaring you will not be fined. Also they are looking at people living in Spain that have homes in the UK.

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Sorry Crown pensions tax is paid in the UK. But and there is a big but...it must be declared. If you work here and have a Crown pension it is added to your annual salary. No tax is forthcoming for the Crown pension, but it may put your annual income into a higher tax bracket.