There's a rather sad misunderstanding about corporation tax in the UK at the moment. Everyone seems to think that we've got a low corporation tax here. When we don't in fact: we've got rather a high one. Oh, sure, we've a low headline rate: but that's very much the smallest part of corporation tax. The much more important part is what are the reliefs, the allowances, what can you claim back, what is actually taxable. Which gives us the effective rate: