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Right. I would love to know whether McDowell makes use of trusts to structure his inheritance tax - or does he structure it so he pays the maximum amount of tax? Does he claim the personal allowance, or does he give that away so he pays the maximum amount of tax? When he has a capital gain, does he use the capital gains allowance? Because that would be tax avoidance.
If you don't want companies to get any deductions, change the tax law. As long as a company abides by the law there is nothing you can do. Tax avoidance is legal, we all do it (see the examples above). Tax evasion is illegal and we already have laws to deal with that.