In the tables of unit's cost below, the amounts of resources and population needed to train the units are shown.
Rating in the table – is the cost of all resources for a certain unit. Server coefficient should be taken into account in further calculations.
The defence parameter of all troops equals 0 initially.

The maximum possible reduction of the army's salary is approximately -99,74%:
By 96%, the remaining salary can be reduced with the help of the Exchequer science.
The remaining 4% can be further reduced by another 80% with various artefacts and spells. It turns out another -3.2%.
Additionally the remaining salary can be reduced by another 67% with the help of Ancient Magic, another -0,54%.
Total minus to salary: (-96%)+(-3.2%)+(-0,54%) = -99,74%

Example:
Let's say the salary of the whole army is 20,000 gold per hour. With the help of the Exchequer science, studied to level 20, the basic salary is reduced by 96%. 20000-96% (19200) = 800
And already with the help of artefacts, skills and spells, you can lower the main salary by another 80%. In this case, 800-80%(640)=160.
With the Ancient Magic the remaining amount 160 decreases by another 67%. 160-67%(107)=53.

Thus, in total we get the maximum possible reduction in army salaries by 99,74% - 53 gold per hour instead of 20,000


See also:
Units Description
Units Training