What will change in the relationship between the UK and the EU when Article 50 is invoked?
Everything will depend on the negotiations once the United Kingdom formally invokes Article 50. However, even then the timeframe is very broad, as negotiations can last up to two years before the change of status becomes effective.
There are several options that are available to the UK. However, it remains to be seen what the negotiations will uncover.
What impact in Spain will Brexit have on the sale of houses, tourism and expats?
With the exit from the EU, there will be a period of uncertainty in the markets.
The most plausible scenario is that the United Kingdom will want a sort of trade agreement similar to the one that has been initiated with Canada and is being negotiated with the United States. This would allow free movement of capital and almost all kinds of trade.
What about free movement?
It will almost certainly be agreed that no visa is required for Spaniards to travel to the United Kingdom and vice-versa. However, a very different thing will happen with work and residence permits.
With Brexit, what could change for UK nationals in terms of paying taxes?
This is a difficult question to answer, because nobody really knows yet. However, there could be quite an impact on the taxes that UK nationals must pay, especially with inheritance tax, because certain allowances could be removed.
One solution could be the option of donation.