I like An Echo Resounding, which I plan on using for my next campaign. https://www.drivethrurpg.com/product/99063/An-Echo-Resounding-A-Sourcebook-for-Lordship-and-War?
I have this and am embarrassed to say I cannot make head nor tail of it. Is there any indication anywhere of how domain resources relate to gp in the PC's pocket?
Apart from the Companion/RC Dominion system, I think my favourite approach is OD&D "You get 10gp per inhabitant per year".
However in reality I tend to ad hoc handle net income at something like 5 sp per inhabitant per year, assuming all normal expenses covered including structures, military etc. So it's more like "Alasiya Sultanate is worth 80,000gp/year" or "Rugalov Barony is worth 5,000gp/year" - then the player gets to play with the cash, spend it on magic bling typically.

Edit: Just whatever you do don't use the 5e DMG system where what should be resources are actually a drain on the PC's wealth, even straightforward commercial stuff like inns! Players don't mind not getting millions of
gp in revenue (as most domain systems tend to generate) but they hate being told to cough up for the privilege of running a domain. Assume income covers routine expense, give a small bonus, and the critters are happy as hamsters on a wheel.

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