Stability

From EU3 Wiki

Stability (Stab) represents the social stability of your realm and is shown as a value from -3 to +3 (positive being better). This number will change through actions that you make especially when declaring war, through choices you make with events, as well as events that you are forced to accept. Your stability level is increased depending on how much you pay into the investment sliders. The cost of recovering stability is mainly a function of how many provinces you control, but also note that it costs twice as much to reach Stab +2, and three times as much for +3, versus the cost to increase from -2 through +1.

At high levels you will receive more income from your taxes and at lower levels you will experience a greater risk of revolt across all your provinces.

The importance of keeping your stability at least above negatives is paramount in your goal to keep your realm productive.

Actions affecting your stability:

• -1: Declaring war against a country of the same religion.
• -1: Canceling a royal marriage.
• -1: Moving any domestic policy slider in any direction.
• -1: Declaring war against a nation with whom you have a royal marriage.
• -1: Declaring war against a nation with whom you have good relations (100-149).
• -2: Declaring war against a nation with whom you have great relations (150+).
• -2: Declaring war without a casus belli.
• -3: Declaring war against a nation which is your vassal.
• -5: Declaring war against a nation with whom you have a truce.
• -5: Declaring war against a nation with whom you have military access to.
• -1 to -7: Changing your form of government, this depends on what form of government you currently have and what you are switching to.
• -3 to +3: As a result of some event options.

These shifts in stability are cumulative. So if you declare war against a country that you have military access with and is the same religion, the total stability hit will be -6.

For specifics on the factors affecting the price of stability, see Stability costs.