The three Ts were high on the G8's agenda - trade, tax and transparency.
The leaders represent just over half a near $72 trillion dollar global economy.
British Prime Minister David Cameron says they made progress in all three areas.
SOUNDBITE: David Cameron, British Prime Minister, saying (English):
"We launched negotiations on the biggest bilateral trade deal in history, we agreed a Lough Erne declaration that has the potential to rewrite the rules on tax and transparency, for the benefit of countries right across the world, including the poorest countries in the world."
All the leaders are facing economic challenges at home.
They urged Japan to press ahead with reforms to tackle its budget deficit.
And the euro zone to work on its banking union.
But the biggest topic for summit chair Britain was taxation.
Cameron has been stung by revelations that big multinationals like Starbucks and Google have cut their corporate tax bills in
