How much you pay in tax depends on personal allowances, tax rates and brackets, social security contributions and benefits; the numbers can start to get confusing.
One way to cut through the muddle is to think in terms of the tax wedge. In basic terms, this is the difference between the net earnings that a worker takes home at the end of the year and what it costs to employ that worker. On the employer’s side, this cost includes the worker’s salary as well as employer contributions for social security (e.g. healthcare, pensions); on the worker’s side, the negatives are income tax and employee social security payments, while the positives include the salary and, possibly, cash benefits, for instance.
The tax wedge ranges from just over 15% in Mexico for a single worker on an average wage, to just over 55% in Belgium.