RichT wrote on Sun Jan 14, 2024 8:32pm:
Firstly, in the UK, if you sell a property which is not your main residence, then you will have to pay Capital Gains Tax (CGT). This appears to apply to you, as you state that you live in Spain - it doesn't matter if you are renting, it's the fact that your UK house is not your main residence. If...
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... you visit the gov.uk website, there is a useful Capital Gains Tax calculator.
Secondly, if you are already a tax resident in Spain, then if you sell your house in the UK, you will be charged CGT in Spain, but you can offset against that any CGT that you have already paid in the UK.
Regarding your pension, PeterC's first post is correct.
I heard today that if you are over 65 and you sell your primary UK residence (primary being the important bit there), you are most probably not liable for CGT in Spain even if it is in the same year you become tax resident in Spain. My brother is over 65 and will be in that situation so I was starting to look for mitigation.
I haven't dug as deep as I need with tax accountants yet but I am getting that message consistently from quite a few sources. The answer is probably to call a tax accountant with your specific circumstances. You may get a nice surprise rather than a 19% and upwards bill from the taxman.