Speaking after meeting with the network of overseas territories and Crown dependencies, David Cameron said: "if companies don't properly pay their taxes or individuals don't properly pay their taxes we all suffer as a result, so it is important that we get our house in order."
More top news
David Cameron is facing growing pressure for the UK to take in more of the many thousands of migrants fleeing to Europe.
China has put on its biggest display of military might in a parade to commemorate victory over Japan in World War Two.
Hungarian Prime Minister Viktor Orban is to meet with European Union leaders in Brussels today to discuss the migration crisis.