Treasure Room

Treasure Rooms allow your kingdom to tax its Peasants and collect Gold. Every Treasure Room built increases the amount of the player can hold by.

Placing the map's first Treasure Room on the map will upgrade the look of the Keep, making it more formidable. This change is purely aesthetic.

If a Treasure Room is destroyed, the stored in it is lost.

Note that the Tax Collectors can be fired by closing all Treasure Rooms from the Job Priority or Building menus which frees up the workers, but doesn't stop gold from being collected automatically. This may be patched in the future.

Taxation
The tax rate can be set at 5% intervals anywhere between 0% and 30%.
 * A Hovel generates per 5% tax rate (0, 1.25, 2.5, 3.75, 5, 6.25, or 7.5 gold per year)
 * A Cottage generates per 5% tax rate (0, 2.5, 5, 7.5, 10, 12.5, or 15 gold per year)
 * A Manor generates per 5% tax rate (0, 6.25, 12.5, 18.75, 25, 31.25, or 37.5 gold per year)

Increasing the tax gradually lowers the household happiness in the kingdom by a varying amount per tax rate.
 * Tax rate of 0% does not provide any penalty.
 * Tax rate of 5% is a penalty of in each Hovel, Cottage, and Manor on the same landmass
 * Tax rate of 10% is a penalty of per residence
 * Tax rate of 15% is a penalty of per residence
 * Tax rate of 20% is a penalty of per residence
 * Tax rate of 25% is a penalty of per residence
 * Tax rate of 30% is a penalty of per residence

New kingdoms established on islands by building an Outpost can't collect taxes from local households until a Treasure Room is built on the same island as the Outpost.

Tax rates are based on an occupied home's residence type, not the current population. A Manor with one person will have the same tax output as a full Manor. Effectively divided from a full peasant home, peasants are charged 0.25 in Hovels, 0.2083 (repeating 3's) in Cottages, and 0.25 in Manors per 5% tax rate. Hovels and Manors are more efficient to tax per peasant.

Aside from underpopulated wage-heavy areas, 10%-15% is usually reasonable after the buildings are constructed. Temporarily increasing the taxation amount just long enough to construct something, especially prior to a Raid, will not have long-lasting effects on even moderately happy populaces - just remember to reduce the tax rate to a more reasonable level again afterward!