Seeing the name 'Blackbird Heavy Industries,' one can deduce that this is a super enterprise with heavy industry as its main business. They are nominally still part of the Alliance, but since the second-generation governor, they have gradually distanced themselves from the Alliance. They pay the Imperial Tax every two years as more of a symbolic gesture.
Based on their jurisdiction of ten million people, they should be paying products worth two million Tax Currency every tax period to the Alliance Government as their annual tax contribution.
However, in the past six years, across three tax periods, the most they've ever paid was four hundred thousand Tax Currency, and the least was two hundred thousand Tax Currency.
The difference is significant, but the key issue is that the Alliance Government is powerless to collect the full amount.