One idea is that 40% goes to the department who got the cash, and then 10% to the other departrments and 10%to the NT.
Like say the Trade Dept made 100 gold in a deal it would be spread out like this:
Trade: 40%
Foriegn: 10%
Military: 10%
Culture: 10%
Science: 10%
Domestic: 10%
National Treasury: 10%
But the only thing is we need to use a calculator in the event a number doesn't split easily. But this is an idea and doesn't have to be used. Or the rellocation method. All the money goes to the pool and then is payed out, but the dept it most concerns gets a little more.
For example, if we get 346 gold selling a resource, most should go to Trade and Foriegn then Domestic, then Military, then Culture and Science the get the same amounts and the National Treasury Gets what's left over.
Example:
Income, 346 gold in selling a resource
Trade:100
Foriegn: 75
Domestic:50
Military: 41
Culture: 30
Science: 30
National: 20
Total=346g
All we need is someone with a calculator.