David Cameron said he believes in low taxes for businesses because he wants "Britain to be a winner in the global race" but said it was important to make sure companies pay what they should.
The Prime Minister spoke as he arrived at an European Union summit in Brussels.
More top news
The UN has said it is deeply concerned by reports hundreds of Syrian men have disappeared amid a mass exodus from rebel-held areas.
A man suspected of planning a terrorist attack has been arrested in Rotterdam after police found a loaded AK-47 in his apartment.
Another mild day with highs reaching up to 13C degrees in mild southerly winds