There are a number of tax breaks for foreigners, meaning effectively if you have not live in Portugal for 5 years you do not pay hardly any tax. This is dependent on you getting good advice.
Re:Portugal’s Economic Revival
by galfarragem on Saturday December 29, 2018 @04:49AM
(#18782879)
"Dividends are Tax free from the UK for 10 years, 20% on local income. EU passport if you spend 500k on property"
https://news.ycombinator.com/item?id=18165995
As an anecdote, Madonna is nowadays living in Portugal. Media says the reasons are the Lisbon sunlight and her son wants to learn soccer.
Can you elaborate on what or how the tax system is very lax for foreigners?