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Stability is a measure of the nation's internal peace. Unstable nations are more likely to face revolts and turmoil, while stable nations enjoy increased prosperity.
Like many other game mechanics, a player spends monarch power to increase stability, in this case administrative power (
). Since these are also the points that go towards increasing the number of ideas and development, it is less likely that a country will always be at peak stability since a player may plan on investing monarch power in other things.
Maintaining at least neutral (0) or positive stability reduces the chance of rebellion and increases national income, amongst other minor benefits.
Increasing stability also grants 
+1 Absolutism.
Effects of positive stability[edit | edit source]
For each additional level of positive stability, a country benefits from:[1]
 |
+1%.00 |
Global trade power
|
 |
+5%.00 |
Foreign spy detection
|
 |
−1.00% |
National unrest
|
 |
+5%.00 |
National tax modifier
|
 |
+0.5%0 |
Missionary strength
|
 |
+0.02% |
Commanderies faction influence
|
 |
+0.03% |
The aristocrats influence
|
 |
+0.03% |
Jacobin influence
|
 |
+50%.00 |
Stability cost modifier
|
 |
+1.00% |
Monthly fervor
|
 |
+0.50% |
Yearly devotion
|
 |
−0.02% |
Yearly corruption
|
 |
+5%.00 |
Institution spread
|
 |
+0.25% |
Yearly harmony increase
|
Effects of negative stability[edit | edit source]
For each additional level of negative stability, a country is hit by:[2]
|
−1% |
Global trade power
|
|
−5% |
Foreign spy detection
|
|
+2% |
National unrest
|
 |
−1% |
Yearly legitimacy
|
 |
+1% |
Annual interest
|
 |
−10% |
Migration cost
|
|
−1% |
Yearly devotion
|
 |
−5% |
Caravan power
|
|
−0.25 |
Yearly harmony increase
|
Additionally, a nation at −3 stability cannot declare war, and must accept any offered peace deal that is 30% or more below the current warscore.
The base price for increasing stability is 100 administrative power, but overextension and lack of religious unity can increase this cost significantly. Some ideas and advisors decrease this. There are also events and other random factors also modifying the price temporarily. Stability cannot go higher than 3; any events that increase stability at this maximum will not increase stability further.
Main modifiers that affect the cost of raising stability are:
- +50% increase per point of positive stability.
- +50% if another country has sown discontent in the country.
- +
(Overextension / 2)%. Half of overextension is added to the cost.
- +(100 − religious unity)%. The lack of religious unity is added to the cost.
- +2*(100 −
republican tradition)%
- A country will usually have increased stability cost if suffering a disaster.
- +25% regency.
The minimum cost to raise stability is 10 administrative power.
Artist advisor: −10%- Calm ruler personality: −10%
- Loyal
Clergy: −2.5% to −10%
- Oligarchic Republic government: −5%
- Bureaucratic Despotism government: −20%
- Tribal Democracy government: −33%
- Tribal Kingdom government: −15%
- Native Council government: −33%
- Siberian Clan Council government: −33%
- American Republic government: −10%
Orthodox religion: −10%
Curia controller: −10%
At 100 Mandate: −10%
Fraticelli religion: −5% (only exists in saves imported from CK2)
Cathar religion: −5% (only exists in saves imported from CK2)
Paulician religion: −20% (only exists in saves imported from CK2)- Being a Lucky Nation: −10%
- Various decisions, like Unify Islam.
From great projects:
- holding Bratsberg (4144) while religion is in Christian group with the great project
Heddal Stave Church 
−2.5%; 
−5%; 
−10%.
- holding Bali (631) while religion is in Dharmic group and has the same religion as its owner with the great project
Pura Besakih −5%; −10%; −15%.
- holding Samarkand (454) while religion is in Muslim group and has the same religion as its owner with the great project
Registan Square −10%; −15%; −25%.
- holding Kostendil (4703) while state and province religion are both Orthodox with the great project
Rila Monasteries −10%; −20%; −30%.
- holding Hampshire (234) while state and province religion are both in Pagan group or province is of English culture, which is accepted by its owner, with the great project
Stonehenge −10%; −25%.
- holding Petén (842) while culture is in Mayan group, which is accepted by its owner, with the great project
Tikal −10%; −20%; −30%.
- holding Neva (33) with the great project
Winter Palace −10%; −20%; −30%.
- The following national ideas decrease stability cost:
