Portugal doesn't tax all pensions in the same way. As the link belows states, personal pensions without an employer contribution are taxed in a different way.
https://www.blevinsfranks.com/tax-and-pensions-portugal/#:~:text=Once%20you%20are%20a%20tax,of%20up%20to%20%E2%82%AC4%2C104.
From all...