The Tax Gap is the difference between tax collected and the potential tax out there.
In the UK, official figures put it at a massive £42bn ($65bn). But unofficial researchers claim it could be as much as £105bn ($164bn) or more.
Offshore tax havens. Clever avoidance tactics. Corporate evasion. See how it all stacks up in my latest visualisation for the Guardian Datablog
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See our organised data here: http://bit.ly/taxgap