[dragonwriter]

> You are missing that the reduction should cause some money sitting in coffers outside to flow back in to US.

No, it won't. The only reason to repatriate it would be to spend it, which (since corporate "income" tax is a tax on retained profits, not income) would result in a 0% tax with or without the tax cut.

No matter how low (so long as it is non-negative) the US corporate tax rate goes, it makes no sense to reptriate the funds and pay taxes on them otherwise.