For people earning less than £34,000 PA, the basic rate of tax is 22%. However, you don't pay tax on your entire salary... there is a personal allowance. For example, if your salary was £15,000 PA, you would receive a personal allowance of £5000 approx, meaning you only pay tax on £10,000 not the full £15,000.
National insurance is about 11% I think but this is not a tax. This is your contribution to the benefits system, to cover health care etc.![]()