When you hit in war, you'll see that 20% of your plunder is taken out as "war tax" The total tax from both club's is added up and is spread accordingly to the winning side, depending on how much plunder you contribute to your club to win the war.
The 20% goes into the war plunder. After the war, all the plunder is dostributed only to the winning side. I think if you make 10% of all the plunder on your side, and you win, you get 10% of ALL the plunder. If I'm wrong please tell me
Again, it's spread according to contribution, which ever cow has the highest plunder from their hits will get the most tax at the end.