How to increase player faction income

[Marcus_Antonious]

i already know how to tweak other factions income but what i want to do
is to tweak player faction income without affecting AI factions, basically i want
to make more money in order to build 40 units armies, is there some way to do that?

[Dietre]

startpos.esf there is a player start income you can adjust to whatever u want

[Magnar]

you can just give the faction you want to play a faction to trait with bonus income.