Pay-as-you-earn (PAYE) systems are designed to collect the correct amount of tax throughout the course of the year as taxpayers earn the associated income. The U.S. has a simple PAYE system, which applies withholding predominantly on wage income. By contrast, other countries, such as the United Kingdom (U.K.) and New Zealand, have a broader PAYE system collecting tax on a range of payments beyond simple wages. The U.K. has been so successful at this expansion that approximately two-thirds of British taxpayers end each year having already fully and accurately satisfied their tax liabilities.