Ann: FY22 Q2 Quarterly Activities Report and Appendix 4C, page-300

You will find that Porto region is a lot less than lisbon. Whole of Portugal and all industries average wage is 900 euros GROSS

https://teleport.org/cities/porto/salaries/ In american $

Here it shows earning for each city for software developers after tax.

Here is a great comparison with porto 19k , melbourne 57k and copenhagen 62k .
https://teleport.org/compare/porto-vs-melbourne-vs-copenhagen/

and again Porto 19k , zurich 100k and dublin 44k
https://teleport.org/compare/porto-vs-zurich-vs-dublin/

And yes in Portugal On top you will have this.

Employer

Employer Payroll Contributions

23.75%

Social Security

1.75%

Labor Accident Insurance

1.00%

WGF (wage guarantee fund)

26.50%Total Employment Cost

Employee Income Tax

14.50%

up to 7,116.00 EUR

23.00%

7,116.01 EUR to 10,736.00 EUR

26.50%

10,736.01 EUR to 15,216.00 EUR

28.50%

15,216.01 EUR to 19,696.00 EUR

35.00%

19,696.01 EUR to 25,076.00 EUR

37.00%

25,076.01 EUR to 36,757.00 EUR

43.50%

36,757.01 EUR to 48,033.00 EUR

45.00%

48,033.01 EUR to 75,009.00 EUR

48.00%

75,009.01 EUR and above