My situation ....
Property bought three years ago. After all fees, installation of kitchen and bathroom and fully furnished it has cost €100,000 for which I have receipts. There is no mortgage on the property.
Since then I have remained a non-Resident and have paid all my taxes due in Spain.
Suppose I advertise and sell the property fully furnished through an agent for €150,000 and the agent takes €10,000 so that I agree to receive €140,000 before any deductions for legal fees and taxes.
Can someone please explain the set of deductions taken and the timetable for everything ? Deductions include legal fees, 3% retention amount and finally CGT. Is there anything else I've missed ?
How long after selling do I have the money in my bank account before I must settle my CGT bill and start the long wait to receive the 3% retention amount back ? Is it only three months to settle the CGT ?
How does it work with the double taxation treaty between the UK and Spain ? Where do I pay the CGT ?
Finally, I have heard stories of people who intend to return to the UK, not paying the CGT and letting the government keep the 3% retention amount instead. Is this common and what are the repercussions ?
Many thanks to anyone who is able to help me understand the process. I'm pretty financially and mathematically literate so extra marks for any equations clarifying it all

Cheers,
Des