This calculator shows how the rump of Yahoo, to be called Altaba - primarily stakes in Alibaba and Yahoo Japan - could change in value if Donald Trump and the U.S. Congress cut corporate taxes.

The main inputs are the new federal corporate income-tax rate - we've assumed 15 percent by default, against a current rate of 35 percent - and the price at which Yahoo sells its core business. The current deal with Verizon is priced at $4.8 billion, but that could change.

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