Law / How to legally do an agency contract in Poland? [12]

We are a firm (HR) based on North East Asia, (Malaysia)
We wanted to make a periodic dual cooperation contract with a firm (HR) based in Poland.
I wonder if anybody could suggest the right method to do a legal contract.
PS: We don't have any branches in Poland.
Please suggest!

Work / What are the Tax contribution that a foreigner employee should pay against income/months in PL (excluding PIT) [2]

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I wonder if anybody could suggest.
What are the exact tax contribution that a foreigner employee should pay against income/month who is working for Polish Employer.

Some source suggested me that PIT must be deducted from the gross salary, and Health Insurance Contribution and Social Security Contribution will be paid by Employer on behalf of Employee. That means that Employee will get net salary after PIT deduction. I wonder if the Health Insurance Contribution and Social Security Contribution will be paid by Employer on behalf of Employee, then Doesn't those pay shall be counted as gross salary?

Is it true that Employer will pay Health Insurance Contribution and Social Security Contribution on behalf of Employee without deducting from Employee's Gross Salary.

But I have come to some source that, the employee should pay from his gross salary (Refn : home.kpmg.com/xx/en/home/insights/2011/12/poland-other-taxes-levies.html)[/url]

1) Pension Fund (9.76%)
2) Disability Fund (1.5%)
3) Illness Fund (2.45%)
4) Mandatory health insurance contributions are also payable by the employee at 9% of income, however, 7.75% is deductible from tax as a credit, so in practice the net cost to the individual is 1.25%

5) What about Social security contribution??

PS for Non EU employee.

Please suggest.