DEFINITION: The taxes included in the measure are personal income taxes, employees’ social security contributions and employers’ social security contributions. For the few countries that have them, it also includes payroll taxes. The amount of these taxes paid in relation to the employment of one average worker is expressed as a percentage of their labour cost (gross wage plus employers’ social security contributions and payroll tax). An average worker is defined as somebody who earns the average income of full-time workers of the country concerned in sectors C-K of the International Standard Industrial Classification (ISIC). The average worker is single, meaning that he or she does not receive any tax relief in respect of a spouse, unmarried partner or child.