The 'Employer Contribution' is the Employer payroll liability.
The employer liability “contribution” is different for each country and will be applied as a percentage of the annual gross salary, based on the statutory requirements for the country your employee is living and working in. Each country's payroll taxation and required employer contributions are different.
Typically the employer contribution can include:
1. Employer portion of payroll taxes
2. Expenses on Insurance (like social security, unemployment taxes, pension, third party liability insurance, Work Injury Insurance etc.)
3. Other payroll-related costs