
Effect · every source
How to reduce Mercenary Hire Cost in CK3
6 sources raise Mercenary Hire Cost and 7 lower it in the game files of patch 1.20.0.3 — for this one, lower is better.
mercenary_hire_cost_multThe biggest reductions
-50%Malleable SubjectsCultural tradition · Characters of this culture- -30%Soldiers of Lesser FortuneLifestyle perk · Not Adventurer government
- -15%Mercenary ContactsLifestyle perk
What lowers Mercenary Hire Cost (7)
Lifestyle perks (2)
Soldiers of Lesser Fortune-30%
Not Adventurer government
soldiers_of_lesser_fortune_perk· game/common/lifestyle_perks/00_martial_2_authority_tree_perks.txtmercenary_contacts_perk· game/common/lifestyle_perks/00_wanderer_3_voyager_tree_perks.txt
Cultural traditions (2)

Characters of this culture
tradition_fp2_malleable_subjects· game/common/culture/traditions/03_fp2_traditions.txt
Characters of this culture
tradition_fp3_frontier_warriors· game/common/culture/traditions/03_fp3_traditions.txt
Buildings (1)

Caravanserai-6.4%
Holder
Levels 1–8: -0.8% to -6.4% (8 levels give it)
caravanserai· game/common/buildings/00_standard_economy_buildings.txt
Laws (1)
Imperial Pacification-15%
Imperial Policies · Rulers with this law
imperial_expansion_law· game/common/laws/03_imperial_policies.txt
Dynasty legacies (1)
Renowned Name-10%
Glory legacy · Members of the dynasty
glory_legacy_2· game/common/dynasty_perks/00_dynasty_perks.txt
What raises Mercenary Hire Cost (6)
Governments (6)
Administrative+200%
Rulers with this government
administrative_government· game/common/governments/00_government_types.txtCelestial+200%
Rulers with this government
celestial_government· game/common/governments/00_government_types.txtMeritocratic Khanate+200%
Rulers with this government
steppe_admin_government· game/common/governments/00_government_types.txtMeritocratic+200%
Rulers with this government
meritocratic_government· game/common/governments/00_government_types.txtEcclesiastical+200%
Rulers with this government
ecclesiastical_government· game/common/governments/02_theocratic_government_types.txtAdventurer+100%
Rulers with this government
landless_adventurer_government· game/common/governments/00_government_types.txt
Source: game/common/buildings/00_standard_economy_buildings.txt, game/common/culture/traditions/03_fp2_traditions.txt, game/common/culture/traditions/03_fp3_traditions.txt, game/common/dynasty_perks/00_dynasty_perks.txt, game/common/governments/00_government_types.txt, game/common/governments/02_theocratic_government_types.txt, game/common/laws/03_imperial_policies.txt, game/common/lifestyle_perks/00_martial_2_authority_tree_perks.txt, game/common/lifestyle_perks/00_wanderer_3_voyager_tree_perks.txt and the English localisation, Crusader Kings III 1.20.0.3. Building chains are shown once, at their strongest level, with the range over their levels. Effects that come only from events or scale with a script value are not listed.