Taxation in warsaw for non residents?

Hi,

I am considering a job offer from an employer in Warsaw, I wanted to know about the taxation policy for non residents. I am from India, so will I have to pay extra tax above the normal 18%??

See the link below

worldwide-tax.com/poland/poland_tax.asp

There is an initial allowance of PLN 3,091 on the lowest income bracket.
1 -85,528 @18% and then 32%
Social security 13.71%