@evan
If they've established themselves elsewhere—job, home—no.
Conversely, unlike some countries, emigrants shouldn't have to pay taxes on income not earned in their former country.
They regain the right on return.
And for the same reason, immigrants¹ who have established themselves somewhere—job, home,… —should be allowed to vote after at most 5 years.
Disclosure: I emigrated from England and never voted there since.
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1. Funny how it's mostly white people who are called "expats", people of colour are "immigrants"