Am i paying tax i shouldn1t?

I think it's just "Tax Office" which doesn't help much! Could it be IBI (community charge)?

Anyone owning property in Spain as a non-resident is liable to be taxed as if they were renting it, at least for some time during the year.. I am not sure if this tax is covered by the Dual Taxation Agreements, but this has been changed to the disadvantage of Spanish residents receiving Government (not State) pensions which now must be declared under "exempt" when doing your annual tax return. The assessments seem arbitrary, and in the same way anyone resident in Spain but owning property in the UK is assumed to be renting it for a period and is taxed on it. This is in addition to the Form720 where any asset anywhere in the world worth over 50000GBP must be declared - the tax is low but the fines for non-declaration can be horrendous. HMRC now talks to the Agencia Tributaria.

The reasons are obvious, that the honest few are being punished for the fiddling many. It is worth discussing with a good gestoria, one who really understands the rules that apply to ex-pats, resident or otherwise.