Ask HN: How are remote developers taxed?

Hi HNers,

(Asking this again as last I asked about a week ago at an inconvenient time of the day so only got a single response(thx mtmail!). ..I think this offset will prompt more results hopefully? as I believe this is a question many would want answered..) Original post: https://news.ycombinator.com/item?id=16251000

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I am a developer in London and I want to move to a remote role working from Portugal. While there are quite a few roles available remotely, I have never quite understood how the taxation works.

e.g. If you work for a US/UK company and you are based in Portugal (for example), do you pay double taxation or are you only taxed at source/destination?

Are remote roles then advertised as cost to company or what you will actually get before any said tax?

Is there any metric online calculator for this sort of thing or a simple way to work it out?