Prime Minister John Key is shown here meeting with Turkish President Abdullah Gul in Ankara, Türkiye, in April 2010. During this visit Key signed a double-tax agreement with Turkey, along with a working-holidays scheme agreement. Double-tax agreements (DTAs) relieve the tax burden on income derived across international borders. Such income can potentially be taxed by two countries, and DTAs aim to reduce any impediment to trade this might cause. In 2012 New Zealand had DTAs with 37 of its main trading and investment partners.