Yahoo owes taxes?
My first thought on reading the headline was 'Yahoo has income?'
Reading further it becomes clear that this was just a normal high faluting divestment scam which the IRS wants a piece of.
Digging into this, after selling it's core business to Verizon, it changed its stock name to Altaba and became essentially a holding company for Yahoo's remaining shares of Alibaba. CNN reported in 2017 that sales of the Alibaba shares would result in a massive tax bill and they were right.