In the case that a country experiences current account deficit for a long period of time, the issue of its sustainability and financing arises. If the arbitrary criteria by IMF is taken into consideration a nation's current account deficit is unsustainable if it exceeds the level of 5% of GDP.
However, the experience of some countries (Australia, Malaysia and South Korea) has shown that these countries managed to maintain and finance while running a higher level of nation’s current account deficit (to far over 5%) over a period of several years, in order to then successfully reduce their deficits and even more moved again to current account surplus.