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Negative overextension modifiers

Overextension.pngOverextension is a game mechanic modelling the issues caused by rapid expansion.

Each non-core province causes overextension equal to 80% of its development. For example, a province with a development of 10 will add 8% overextension regardless of how big the country is. Overextension has no cap; it can potentially go far beyond 100% and its penalties will continue to increase.

Any province which was settled by colonization doesn't give overextension even if it is conquered by another country after the colony finishes. This doesn't include provinces settled by native tribes.

Effects[edit | edit source]

These are the effects at 100% overextension:

Trade power abroad.png −100%.00 Trade power abroad
Stability cost modifier.png +50%.00 Stability cost modifier
Mercenary cost.png +50%.00 Mercenary cost
Diplomatic reputation.png −2.00% Diplomatic reputation
Improve relations.png −50%.00 Improve relations
National unrest.png +5.00% National unrest
Yearly corruption +0.50% Yearly corruption
Secretariat faction influence +0.50% Secretariat faction influence
Guilds influence +0.50% The guilds influence

In addition, the AI will view overextended countries more negatively, and will be more likely to either declare war itself, or form a coalition against that country.

At over 100% overextension:

  • Monthly chance of increasing progress to each uprising is multiplied by more than , growing with higher overextension (though still capped at 75%.)
  • Various nasty events will trigger, doing things such as lowering stability or hurting trade. The base frequency is one bad event per year, with the time decreasing with higher overextension. Members of the Holy Roman Empire will be reluctant to support reforms while the Holy Roman Emperor is overextended.

These penalties combined can really destabilize a country. It is advised not to go above 100% overextension as the severity of the risks rises dramatically.

Overextension can be reduced by:

  • Coring provinces, which takes time and Administrative power.png administrative power
  • Selling or granting non-cored provinces to subjects to let the subjects core them (you may be able to annex them later)
  • Selling provinces to other nations
  • Releasing a vassal that has a core on it
  • Making a new client state from the non-cored provinces (Art of War.png Art of War only)

Note that a country will only accept buying a province if they have a core on the province, or it has the same culture group and religion. They also should not be overextended themselves.

Administrative efficiency[edit | edit source]

Administrative efficiency.png Administrative efficiency directly reduces core creation and diplo-annexation costs. It also reduces the impact of province development on overextension, warscore cost and aggressive expansion, allowing for much larger territories to be conquered at once. All effects of administrative efficiency are capped at 90%.

Modifier[edit | edit source]

Ideas that boost efficiency:

Administrative efficiency.png Traditions Ideas Bonuses Policies
  • Deccani traditions
  • Bharathi idea 6: Brahmin Administration
  • Great Qing idea 5: Chinese Laws
  • Great Yuan idea 6: Sino-Mongol Administration
  • Imperial German idea 6: Reichstag
  • Roman idea 6: Imperial Bureaucracy
  • Scandinavian idea 2: Unified Scandinavia
  • Holy Roman ambition

Further modifiers:

Administrative efficiency.png Type
+10% Administrative technology.png administrative technology level 17
+10% Administrative technology.png administrative technology level 23 (cumulative)
+10% Administrative technology.png administrative technology level 27 (cumulative)
+0.3% Per point of Absolutism.png absolutism or Revolutionary zeal.png revolutionary zeal (max +30%)
+5% Age of Absolutism.png Age of Absolutism splendor ability “Administrative Efficiency”
+5% holding Great project alhambra.pngAlhambra at Great project level icon tier 3.png Magnificent level (only with Leviathan.png)
+2.5% Political Absolutism government reform

A custom nation can have a national idea of up to +10% administrative efficiency.

Mission reward modifiers:

Administrative efficiency.png Time Type
+10% 20 years Mission.png Invade China (Horde mission tree)
+10% Permanent Mission.png Viceroyalty Deccan event choice (Mughals mission tree)
+5% Permanent Mission.png Glory to von Habsburg! (Austrian mission tree)
+5% Permanent Mission.png Break the Chains (Dithmarscher mission tree)
+5% Permanent Mission.png French Revolution (French mission tree)
+5% Permanent Mission.png Kaiserreich (German mission tree)
+5% Permanent Mission.png Carolingian Empire (Lotharingian mission tree)
+5% Permanent Mission.png German Confederation (Prussian/Brandenburgian mission tree)
+5% Permanent Mission.png Russian Revolution (Russian mission tree)
+5% Permanent Mission.png Alpine Powerhouse (Savoyard/Sardinia-Piedmont mission tree)
+5% 20/30 years[1] Mission.png Subiaco Press (Papal mission tree)


Ideas and Policies Idea groupsNational ideasPolicies
Ages and Institutions AgesInstitutions
Innovativeness and Technology InnovativenessTechnology

  1. 20 years with the Rule Britannia.png Rule Britannia DLC and 30 years without it