PAYE or better known as Pay As You Earn effects most people of an employed status. In essence what an employed person earns is immediately taxed at source and that person will receive a net pay after the deductions. Assuming no other income and that the tax payer does not exceed the higher rate of tax there is no necessity to complete a tax return.
There are stringent rules when employing staff and substantial fines for missing deadlines, consequently to better help you understand PAYE please refer to the links below: