The tax gap

The Guardian will examine the extent of tax avoidance by big business, day by day over two weeks. We are naming more than 20 major British companies, and analysing their secretive tax strategies to ask: are they paying their fair share? An interactive database of tax data from the UK’s 100 biggest firms enables Guardian readers to make their own investigations, and to post discoveries and comments of their own to tax gap blog. The Guardian team is led by investigations editor David Leigh.