If you have too much population 
of one tier on one island, royal taxes will be taken from your balance 
. As soon as you reach 1000 population for one tier, royal taxes of 9% of that tier's income will be deducted. Tax rate will increase up to 40% of that tier's income when its population will reach 4875, then it will be stable for higher populations. Royal taxes do take into account income boost from Town Hall items as they apply to the sum of all houses incomes for the tier they refer to. Royal taxes are constantly calculated basing exclusively on population and income of the same tier. The amount of Royal Taxes shown in the main interface is a sum of all tiers' taxes.
Royal Taxes do not apply to the Arctic population tiers (Explorers and Technicians).
Royal Taxes can be checked by hovering your pointer on the Balance icon.
Formula[]
A quick formula for calculating tax rate (with population between 1000 and 4875):
Tax rate is always rounded down. The exact amount of money will be equal to:
Taxes are also rounded down (at least when it comes to the in-game interface). If the income from the tier is 1110 and the tax rate is 9%, 99,9 coins should be deducted per minute. However, the interface shows that royal taxes are equal to 99 coins.
Tax rates[]
The table below shows all tax rates - they are the same for each tier.
| Population | Tax rate | Population | Tax rate | Population | Tax rate | ||
|---|---|---|---|---|---|---|---|
| 0-999 | 0% | 2250 | 19% | 3625 | 30% | ||
| 1000 | 9% | 2375 | 20% | 3750 | 31% | ||
| 1125 | 10% | 2500 | 21% | 3875 | 32% | ||
| 1250 | 11% | 2625 | 22% | 4000 | 33% | ||
| 1375 | 12% | 2750 | 23% | 4125 | 34% | ||
| 1500 | 13% | 2875 | 24% | 4250 | 35% | ||
| 1625 | 14% | 3000 | 25% | 4375 | 36% | ||
| 1750 | 15% | 3125 | 26% | 4500 | 37% | ||
| 1875 | 16% | 3250 | 27% | 4625 | 38% | ||
| 2000 | 17% | 3375 | 28% | 4750 | 39% | ||
| 2125 | 18% | 3500 | 29% | 4875 or more | 40% |
Examples[]
Example 1[]
You have 1500 farmers and 500 workers on your Island. Farmers provide you with 1500 coins of income and the workers with 1000 coins. 13% royal taxes will be deducted from your farmers' income, which is 13% × 1500 = 195 coins.
Example 2[]
You have 6000 farmers on your island. Farmers provide you with 6000 coins of income. 40% royal taxes will be deducted from this, which is 40% × 6000 = 2400 coins.
If instead you have 2 islands each with 3000 farmers, you still get the same income but the taxes are 25% on each island, costing you 1500 coins in total. So getting a second island saves you 900 coins.
If instead you have 3 islands each with 2000 farmers, you still get the same income but the taxes are only 17% on each island, costing you 1020 coins in total. So getting a third island saves you another 480 coins.
Example 3[]
You have 2000 farmers and 3000 workers on one island. Farmers provide you with 2000 income and workers with 4500 income. Tax rate for farmers is 17%, so royal taxes from farmers tier are 17% × 2000 = 340 coins. Tax rate for workers is 25%, so royal taxes from workers tier are 25% × 4500 = 1125 coins. Taxes from each tier are calculated separately and then added, in the end you pay 340 + 1125 = 1465 coins of royal taxes per minute.