Effect · every source

How to increase Holding Taxes in CK3

245 sources raise Holding Taxes and 3 lower it in the game files of patch 1.20.0.3.

tax_mult

The biggest boosts

+40%Hosios LoukasBuilding · County
+35%The Rammelsberg MinesBuilding · County
+35%The Kollur MinesBuilding · County

What raises Holding Taxes (245)

Traits (2)

Avaricious+15%
avaricious · game/common/traits/00_traits.txt
Avaricious+10%
Culture with Maritime Mercantilism
avaricious · game/common/traits/00_traits.txt

Tenets (3)

Transubstantiatio+5%
Counties of this faith
tenet_transubstantiation · game/common/religion/tenet_types/00_pam_tenets.txt
Simonia+5%
Counties of this faith
tenet_simony · game/common/religion/tenet_types/00_pam_tenets.txt
Pastoral Isolation+5%
Characters holding it as a personal tenet
tenet_pastoral_isolation · game/common/religion/tenet_types/00_tenet_types.txt

Holy sites (2)

Kashima Jingū+5%
Hitachi · Followers, while the faith holds it
kashima · game/common/religion/faith_types/00_faith_types.txt
Kashima Jingū+3%
Hitachi · Holder of the county
kashima · game/common/religion/faith_types/00_faith_types.txt

Buildings (238)

Hosios Loukas+40%
County
hosios-loukas · game/common/buildings/00_special_buildings.txt
The Rammelsberg Mines+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
rammelsberg-mines · game/common/buildings/00_special_mines.txt
The Kollur Mines+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
kollur-mines · game/common/buildings/00_special_mines.txt
Gold Mines of Mali+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
mali-mines · game/common/buildings/00_special_mines.txt
Srebrenica Mine+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
srebrenica-mines · game/common/buildings/00_special_mines.txt
The Ratnapura Mines+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
ratnapura-mines · game/common/buildings/00_special_mines.txt
The Mogok Valley Mines+35%
County
Levels 1–4: +20% to +35% (4 levels give it)
mogok-mines · game/common/buildings/00_special_mines.txt
Capital Temple Complex+35%
County
Levels 1–5: +10% to +35% (5 levels give it)
mandala-capital · game/common/buildings/tgp_great_project_buildings.txt
Windmills+34%
Province
Levels 1–8: +6% to +34% (8 levels give it)
windmills · game/common/buildings/00_standard_economy_buildings.txt
Water Management+32%
Province
Levels 1–8: +4% to +32% (8 levels give it)
waterworks · game/common/buildings/00_standard_economy_buildings.txt
Blacksmiths+32%
Province
Levels 1–8: +4% to +32% (8 levels give it)
smiths · game/common/buildings/00_standard_military_buildings.txt
Tax Offices+30%
Each de jure county of the duchy
Levels 1–3: +15% to +30% (3 levels give it)
tax-assessor · game/common/buildings/00_duchy_capital_buildings.txt
Canterbury Cathedral+30%
County
Levels 1–3: +20% to +30% (3 levels give it)
holy-site-canterbury-cathedral · game/common/buildings/00_special_buildings.txt
The Theodosian Walls+30%
County
theodosian-walls · game/common/buildings/00_special_buildings.txt
Temple in Jerusalem+30%
County
Levels 1–2: +30% to +30% (2 levels give it)
dome-of-the-rock · game/common/buildings/00_special_buildings.txt
Cathedral of Santiago de Compostela+30%
County
holy-site-basilica-santiago · game/common/buildings/00_special_buildings.txt
Despots' Palace+30%
County
despot-palace · game/common/buildings/00_special_buildings.txt
Mount Athos+30%
County
Levels 1–3: +10% to +30% (3 levels give it)
mount-athos · game/common/buildings/00_special_buildings.txt
Sant'Apollinare Nuovo+30%
County
apollinare-nuovo · game/common/buildings/00_special_buildings.txt
Saint Catherine's Monastery+30%
County
saint-catherine · game/common/buildings/00_special_buildings.txt
Jvari Monastery+30%
County
jvari-monastery · game/common/buildings/00_special_buildings.txt
Cathedral of Vagarshapat+30%
County
etchmiadzin-cathedral · game/common/buildings/00_special_buildings.txt
Kaifeng Imperial Palace+30%
County
kaifeng-palace · game/common/buildings/00_special_buildings.txt
The Forbidden City+30%
County
forbidden-city · game/common/buildings/00_special_buildings.txt
Itsukushima Shrine+30%
County
Levels 1–2: +10% to +30% (2 levels give it)
itsukushima-jinja · game/common/buildings/00_special_buildings.txt
Heian Palace+30%
County
heian-palace · game/common/buildings/00_special_buildings.txt
Saint Peter's Basilica+30%
County
holy-site-st-peters-basilica · game/common/buildings/cp6_special_buildings.txt
Mont-Saint-Michel+30%
County
Levels 2–4: +10% to +30% (3 levels give it)
mont-st-michel · game/common/buildings/cp6_special_buildings.txt
Kutná Hora Mine+25%
County
Levels 1–4: +10% to +25% (4 levels give it)
kutna-hora-mines · game/common/buildings/00_special_mines.txt
Baofeng Silver Mines+25%
County
Levels 1–4: +10% to +25% (4 levels give it)
baofeng-mines · game/common/buildings/00_special_mines.txt
Grand Mosque of Yazd+25%
County
yazd-mosque · game/common/buildings/cp6_special_buildings.txt
Watermills+24%
County
Levels 3–8: +4% to +24% (6 levels give it)
watermills · game/common/buildings/00_standard_economy_buildings.txt
Legendary Palace+20%
County
legendary-palace · game/common/buildings/00_legendary_buildings.txt
Legendary Hunting Lodge+20%
County
legendary-hunting-lodge · game/common/buildings/00_legendary_buildings.txt
Grand Basilica+20%
County
holy-site-cathedral · game/common/buildings/00_special_buildings.txt
Grand Mosque+20%
County
holy-site-mosque · game/common/buildings/00_special_buildings.txt
Great Fire Temple+20%
County
holy-site-fire-temple · game/common/buildings/00_special_buildings.txt
Grand Temple+20%
County
holy-site-indian-grand-temple · game/common/buildings/00_special_buildings.txt
Grand Temple+20%
County
holy-site-buddhist-grand-temple · game/common/buildings/00_special_buildings.txt
Grand Shrine+20%
County
holy-site-japanese-temple · game/common/buildings/00_special_buildings.txt
Grand Temple+20%
County
holy-site-chinese-temple · game/common/buildings/00_special_buildings.txt
Grand Temple+20%
County
holy-site-se-asia-pagan-temple · game/common/buildings/00_special_buildings.txt
Grand Temple+20%
County
holy-site-other-grand-temple · game/common/buildings/00_special_buildings.txt
Mahabodhi Temple+20%
County
holy-site-mahabodhi-temple · game/common/buildings/00_special_buildings.txt
Imam Ali Mosque+20%
County
holy-site-imam-ali-mosque · game/common/buildings/00_special_buildings.txt
Great Mosque of Mecca+20%
County
holy-site-great-mosque-of-mecca · game/common/buildings/00_special_buildings.txt
Great Mosque of Samarra+20%
County
holy-site-great-mosque-of-samarra · game/common/buildings/00_special_buildings.txt
Cologne Cathedral+20%
County
holy-site-cologne-cathedral · game/common/buildings/00_special_buildings.txt
The Prophetic Mosque+20%
County
holy-site-prophetic-mosque · game/common/buildings/00_special_buildings.txt
Walls of Benin+20%
County
walls-of-benin · game/common/buildings/00_special_buildings.txt
House of Wisdom+20%
County
house-of-wisdom · game/common/buildings/00_special_buildings.txt
Notre-Dame+20%
County
notre-dame · game/common/buildings/00_special_buildings.txt
Brihadeeswarar Temple+20%
County
brihadeeswarar-temple · game/common/buildings/00_special_buildings.txt
Shwedagon Pagoda+20%
County
shwedagon-pagoda · game/common/buildings/00_special_buildings.txt
The Friday Mosque+20%
County
the-friday-mosque · game/common/buildings/00_special_buildings.txt
Temple City+20%
County
khajuraho · game/common/buildings/00_special_buildings.txt
Lund Cathedral+20%
County
lund-cathedral · game/common/buildings/00_special_buildings.txt
Sumela Monastery+20%
County
Levels 1–2: +10% to +20% (2 levels give it)
sumela-monastery · game/common/buildings/00_special_buildings.txt
Maiden's Tower+20%
County
maiden-tower · game/common/buildings/00_special_buildings.txt
Meteora+20%
County
Levels 1–2: +10% to +20% (2 levels give it)
meteora · game/common/buildings/00_special_buildings.txt
Church of Saint Sophia+20%
County
sofia-ohrid · game/common/buildings/00_special_buildings.txt
Lamu Trade Ports+20%
County
swahili-port-lamu · game/common/buildings/00_special_buildings.txt
Shaolin Monastery+20%
County
shaolin-monastery · game/common/buildings/00_special_buildings.txt
Lingyin Temple+20%
County
lingyin-temple · game/common/buildings/00_special_buildings.txt
Quanzhou Seaport+20%
County
quanzhou-seaport · game/common/buildings/00_special_buildings.txt
Po Klong Garai Temple+20%
County
po-klong-garai · game/common/buildings/00_special_buildings.txt
Borobudur+20%
County
borobudur · game/common/buildings/00_special_buildings.txt
Bazaar of Herat+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
herat-bazaar · game/common/buildings/00_special_buildings.txt
Shuka of Dvin+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
dvin-shuka · game/common/buildings/00_special_buildings.txt
Khrom of Lhasa+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
lhasa-market · game/common/buildings/00_special_buildings.txt
Bazaar of Khiva+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
khiva-bazaar · game/common/buildings/00_special_buildings.txt
Marketplace of Cháng'ān+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
changan-market · game/common/buildings/00_special_buildings.txt
Bazaar of Lahur+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
lahur-bazaar · game/common/buildings/00_special_buildings.txt
Hamadan Bazaar+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
hamadan-bazaar · game/common/buildings/00_special_buildings.txt
Marketplace of Dūnhuáng+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
dunhuang-market · game/common/buildings/00_special_buildings.txt
Sunday Bazaar+20%
County
Levels 1–2: +20% to +20% (2 levels give it)
sunday-bazaar · game/common/buildings/00_special_buildings.txt
Kōfuku Temple+20%
County
kofuku-ji · game/common/buildings/00_special_buildings.txt
Enryaku Temple+20%
County
enryaku-ji · game/common/buildings/00_special_buildings.txt
Hwangnyong Temple+20%
County
hwangnyongsa · game/common/buildings/00_special_buildings.txt
Maoshan Academy+20%
County
maoshan-academy · game/common/buildings/00_special_buildings.txt
Silver Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
generic-silver-mines · game/common/buildings/00_special_mines.txt
Gold Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
generic-gold-mines · game/common/buildings/00_special_mines.txt
The Falun Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
falun-mines · game/common/buildings/00_special_mines.txt
Konasamudram Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
konasamudram-mines · game/common/buildings/00_special_mines.txt
Mines of the Forest of Dean+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
dean-mines · game/common/buildings/00_special_mines.txt
Mines of Phnom Dek+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
phnom-dek-mines · game/common/buildings/00_special_mines.txt
Mines of Hanxing+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
hanxing-mines · game/common/buildings/00_special_mines.txt
Chihu Iron Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
chihu-mines · game/common/buildings/00_special_mines.txt
The Takkeda Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
takkeda-mines · game/common/buildings/00_special_mines.txt
The Khetri Copper Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
khetri-mines · game/common/buildings/00_special_mines.txt
The Taghaza Salt Pan+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
taghaza-mines · game/common/buildings/00_special_mines.txt
Ijil Salt Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
ijil-mines · game/common/buildings/00_special_mines.txt
Torda Salt Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
turda-mines · game/common/buildings/00_special_mines.txt
Ziliujing & Gongjing Salt Wells+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
zigong-mines · game/common/buildings/00_special_mines.txt
The Phocaea Alum Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
phocaea-mines · game/common/buildings/00_special_mines.txt
The Sar-i Sang Mines+20%
County
Levels 1–4: +5% to +20% (4 levels give it)
sar-i-sang-mines · game/common/buildings/00_special_mines.txt
Great Mosque of Damascus+20%
County
damascus-mosque · game/common/buildings/ccp3_special_buildings.txt
Kano Earthworks+20%
County
kano-walls · game/common/buildings/ccp3_special_buildings.txt
Lingapura Pyramid+20%
County
pyramid-lingapura · game/common/buildings/cp8_special_buildings.txt
Three Pagodas of Dali+20%
County
three-pagodas-dali · game/common/buildings/cp8_special_buildings.txt
Candi of Muara Takus+20%
County
muara-takus · game/common/buildings/cp8_special_buildings.txt
Stone Pagoda of Mireuksa+20%
County
stone-pagoda · game/common/buildings/cp8_special_buildings.txt
Fanfang of Guangzhou+20%
County
fanfang-guangzhou · game/common/buildings/cp8_special_buildings.txt
My Son Sanctuary+20%
County
my-son-sanctuary · game/common/buildings/cp8_special_buildings.txt
Kizuki Taisha+20%
County
izumo-taisha · game/common/buildings/cp8_special_buildings.txt
Flamboyant Grand Cathedral+20%
County
great-project-cathedral-03 · game/common/buildings/pam_buildings.txt
Reims Cathedral+20%
County
pam-reims-cathedral · game/common/buildings/pam_buildings.txt
Copper Mines+16%
County
Levels 1–4: +4% to +16% (4 levels give it)
generic-copper-mines · game/common/buildings/00_special_mines.txt
Tada Copper Mine+16%
County
Levels 1–4: +4% to +16% (4 levels give it)
tada-mines · game/common/buildings/00_special_mines.txt
The Great Mosque of Cordoba+15%
County
holy-site-great-mosque-of-cordoba · game/common/buildings/00_special_buildings.txt
Great Mosque of Djenne+15%
County
holy-site-great-mosque-of-djenne · game/common/buildings/00_special_buildings.txt
Visby Ringmur+15%
County
visby-ringmur · game/common/buildings/00_special_buildings.txt
The Theodosian Walls+15%
Each de jure county of the duchy
theodosian-walls · game/common/buildings/00_special_buildings.txt
The Aurelian Walls+15%
Each de jure county of the duchy
aurelian-walls · game/common/buildings/00_special_buildings.txt
Temple of Uppsala+15%
County
Levels 1–2: +10% to +15% (2 levels give it)
temple-of-uppsala · game/common/buildings/00_special_buildings.txt
Sanctuary of Imam Reza+15%
County
imam-reza-shrine · game/common/buildings/00_special_buildings.txt
Mount Fuji+15%
County
mount-fuji · game/common/buildings/00_special_buildings.txt
Byeokran Port+15%
County
byeokran-port · game/common/buildings/00_special_buildings.txt
Liuhe Pagoda+15%
County
liuhe-pagoda · game/common/buildings/00_special_buildings.txt
Besakih Temple+15%
County
besakih-temple · game/common/buildings/00_special_buildings.txt
Copper Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
generic-copper-mines · game/common/buildings/00_special_mines.txt
Silver Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
generic-silver-mines · game/common/buildings/00_special_mines.txt
Gold Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
generic-gold-mines · game/common/buildings/00_special_mines.txt
The Rammelsberg Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
rammelsberg-mines · game/common/buildings/00_special_mines.txt
Kutná Hora Mine+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
kutna-hora-mines · game/common/buildings/00_special_mines.txt
Baofeng Silver Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
baofeng-mines · game/common/buildings/00_special_mines.txt
Kremnica Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
kremnica-mines · game/common/buildings/00_special_mines.txt
Zijinshan Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
zijinshan-mines · game/common/buildings/00_special_mines.txt
Jiaodong Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
jiaodong-mines · game/common/buildings/00_special_mines.txt
The Falun Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
falun-mines · game/common/buildings/00_special_mines.txt
Schwaz Mine+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
schwaz-mines · game/common/buildings/00_special_mines.txt
The Liangzhe Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
liangzhe-mines · game/common/buildings/00_special_mines.txt
Argentiera Mine+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
argentiera-mines · game/common/buildings/00_special_mines.txt
The Kollur Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
kollur-mines · game/common/buildings/00_special_mines.txt
Siderokausia Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
siderokausia-mines · game/common/buildings/00_special_mines.txt
Gold Mines of Mali+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
mali-mines · game/common/buildings/00_special_mines.txt
Konasamudram Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
konasamudram-mines · game/common/buildings/00_special_mines.txt
Mines of the Forest of Dean+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
dean-mines · game/common/buildings/00_special_mines.txt
Mines of Phnom Dek+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
phnom-dek-mines · game/common/buildings/00_special_mines.txt
Mines of Hanxing+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
hanxing-mines · game/common/buildings/00_special_mines.txt
Chihu Iron Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
chihu-mines · game/common/buildings/00_special_mines.txt
The Zawar Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
zawar-mines · game/common/buildings/00_special_mines.txt
The Takkeda Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
takkeda-mines · game/common/buildings/00_special_mines.txt
The Khetri Copper Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
khetri-mines · game/common/buildings/00_special_mines.txt
The Taghaza Salt Pan+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
taghaza-mines · game/common/buildings/00_special_mines.txt
Ijil Salt Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
ijil-mines · game/common/buildings/00_special_mines.txt
Torda Salt Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
turda-mines · game/common/buildings/00_special_mines.txt
Ziliujing & Gongjing Salt Wells+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
zigong-mines · game/common/buildings/00_special_mines.txt
The Phocaea Alum Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
phocaea-mines · game/common/buildings/00_special_mines.txt
The Pansjhir Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
pansjhir-mines · game/common/buildings/00_special_mines.txt
The Trepča Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
trepca-mines · game/common/buildings/00_special_mines.txt
The Rudnik Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
rudnik-mines · game/common/buildings/00_special_mines.txt
The Cévennes Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
cevennes-mines · game/common/buildings/00_special_mines.txt
The Guiyang Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
guiyang-mines · game/common/buildings/00_special_mines.txt
The Kaibao Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
kaibao-mines · game/common/buildings/00_special_mines.txt
The Khotan Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
hetian-mines · game/common/buildings/00_special_mines.txt
The Dushan Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
dushan-mines · game/common/buildings/00_special_mines.txt
The Wadi al-Allaq Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
allaq-mines · game/common/buildings/00_special_mines.txt
The Verespatak Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
verespatak-mines · game/common/buildings/00_special_mines.txt
The Nishapur Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
nishapur-mines · game/common/buildings/00_special_mines.txt
Srebrenica Mine+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
srebrenica-mines · game/common/buildings/00_special_mines.txt
The Ratnapura Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
ratnapura-mines · game/common/buildings/00_special_mines.txt
The Sar-i Sang Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
sar-i-sang-mines · game/common/buildings/00_special_mines.txt
The Mogok Valley Mines+15%
Province · culture with Cupellation
Levels 1–4: +15% to +15% (4 levels give it)
mogok-mines · game/common/buildings/00_special_mines.txt
Boudhanath+15%
County
boudhanath · game/common/buildings/cp6_special_buildings.txt
Thuriang Kilns+15%
County
thuriang-kilns · game/common/buildings/cp8_special_buildings.txt
Gothic Grand Cathedral+15%
County
great-project-cathedral-02 · game/common/buildings/pam_buildings.txt
Capital Magistracy+10%
County
Levels 1–8: +1% to +10% (8 levels give it)
capital-bureau · game/common/buildings/00_admin_buildings.txt
Castle+10%
Province · culture with Maritime Mercantilism, coastal
Levels 1–4: +10% to +10% (4 levels give it)
castle · game/common/buildings/00_castle_buildings.txt
City+10%
Province · culture with Maritime Mercantilism, coastal
Levels 1–4: +10% to +10% (4 levels give it)
city · game/common/buildings/00_city_buildings.txt
Legendary Watchtower+10%
County
legendary-watchtower · game/common/buildings/00_legendary_buildings.txt
Grand Temple+10%
County
holy-site-pagan-grand-temple · game/common/buildings/00_special_buildings.txt
Petra+10%
County
petra · game/common/buildings/00_special_buildings.txt
Buddhas of Bamian+10%
County
buddhas-of-bamian · game/common/buildings/00_special_buildings.txt
London Bridge+10%
County
london-bridge · game/common/buildings/00_special_buildings.txt
Golden Gate of Kyiv+10%
County
golden-gate-of-kiev · game/common/buildings/00_special_buildings.txt
Heddal Stave Church+10%
County
heddal-stave-church · game/common/buildings/00_special_buildings.txt
City Walls of Toledo+10%
County
city-wall-of-toledo · game/common/buildings/00_special_buildings.txt
Rainbow Mountains+10%
County
rainbow-mountains · game/common/buildings/00_special_buildings.txt
Cattolica di Stilo+10%
County
cattolica-stilo · game/common/buildings/00_special_buildings.txt
Port of Mombasa+10%
County
swahili-port-mombasa · game/common/buildings/00_special_buildings.txt
Pate Island Trade Ports+10%
County
swahili-port-pate · game/common/buildings/00_special_buildings.txt
Leshan Giant Buddha+10%
County
leshan-giant-buddha · game/common/buildings/00_special_buildings.txt
Yungang Grottoes+10%
County
yungang-grottoes · game/common/buildings/00_special_buildings.txt
Wudang Mountain Temples+10%
County
wudang-mountain-temples · game/common/buildings/00_special_buildings.txt
Giant Wild Goose Pagoda+10%
County
giant-wild-goose-pagoda · game/common/buildings/00_special_buildings.txt
Ise Shrine+10%
County
ise-jingu · game/common/buildings/00_special_buildings.txt
Dazaifu Office+10%
County
dazaifu · game/common/buildings/00_special_buildings.txt
Mount Baekdu+10%
County
mount-baekdu · game/common/buildings/00_special_buildings.txt
Dâu Temple+10%
County
dau-temple · game/common/buildings/00_special_buildings.txt
Muaro Jambi Compounds+10%
County
muaro-jambi · game/common/buildings/00_special_buildings.txt
Hanging Temple+10%
County
hanging-temple · game/common/buildings/00_special_buildings.txt
Pagoda of Fogong Temple+10%
County
pagoda-of-fogong-temple · game/common/buildings/00_special_buildings.txt
Tiantai Monasteries+10%
County
tiantai-monasteries · game/common/buildings/00_special_buildings.txt
Jizu Shan Temples+10%
County
jizu-shan-temples · game/common/buildings/00_special_buildings.txt
Nanhua Temple+10%
County
nanhua-temple · game/common/buildings/00_special_buildings.txt
Xiuyan Jade Mines+10%
Province · culture with Cupellation
Levels 1–4: +10% to +10% (4 levels give it)
xiuyan-mines · game/common/buildings/00_special_mines.txt
Itoigawa Jade Mines+10%
Province · culture with Cupellation
Levels 1–4: +10% to +10% (4 levels give it)
itoigawa-mines · game/common/buildings/00_special_mines.txt
Lantian Jade Mines+10%
Province · culture with Cupellation
Levels 1–4: +10% to +10% (4 levels give it)
lantian-mines · game/common/buildings/00_special_mines.txt
Fengtian Jade Mines+10%
Province · culture with Cupellation
Levels 1–3: +10% to +10% (3 levels give it)
fengtian-mines · game/common/buildings/00_special_mines.txt
Hpakant Jade Mines+10%
Province · culture with Cupellation
Levels 1–4: +10% to +10% (4 levels give it)
hpakant-mines · game/common/buildings/00_special_mines.txt
The Suvarnadvipa Mines+10%
Province · culture with Cupellation
Levels 1–4: +10% to +10% (4 levels give it)
suvarnadvipa-mines · game/common/buildings/00_special_mines.txt
Temple+10%
Province · culture with Maritime Mercantilism, coastal
Levels 1–4: +10% to +10% (4 levels give it)
temple · game/common/buildings/00_temple_buildings.txt
Holy Wisdom of God+10%
County
holy-wisdom · game/common/buildings/ccp3_special_buildings.txt
Great Stupa of Sanchi+10%
County
sanchi-stupa · game/common/buildings/cp6_special_buildings.txt
Iron Pillar of Delhi+10%
County
Levels 2–4: +5% to +10% (3 levels give it)
qutb-minar · game/common/buildings/cp6_special_buildings.txt
Great Buddha of Kamakura+10%
County
buddha-kamakura · game/common/buildings/cp8_special_buildings.txt
Maijishan Grottoes+10%
County
maijishan-grottoes · game/common/buildings/cp8_special_buildings.txt
Iron Lion of Cangzhou+10%
County
iron-lion-cangzhou · game/common/buildings/cp8_special_buildings.txt
Slopes of Russet+10%
County
chocolate-hills · game/common/buildings/cp8_special_buildings.txt
Temple of Confucius+10%
County
confucius-temple · game/common/buildings/cp8_special_buildings.txt
Romanesque Grand Cathedral+10%
County
great-project-cathedral · game/common/buildings/pam_buildings.txt
Palais des Papes+10%
County
pam-palais-de-papes · game/common/buildings/pam_buildings.txt
Archbasilica of Saint John Lateran+10%
County
pam-lateran-basilica · game/common/buildings/pam_buildings.txt
Temple Citadel+10%
Province · culture with Maritime Mercantilism, coastal
Levels 1–4: +10% to +10% (4 levels give it)
temple-citadel · game/common/buildings/temple_citadel_buildings.txt
Farms & Fields+9%
Province · culture with Polders, coastal
Levels 1–8: +2% to +9% (8 levels give it)
cereal-fields · game/common/buildings/00_standard_economy_buildings.txt
Wetland Farms+9%
Province · culture with Polders, coastal
Levels 1–8: +2% to +9% (8 levels give it)
peat-quarries · game/common/buildings/00_standard_economy_buildings.txt
Orchards+8%
Province · culture with Polders, coastal
Levels 1–8: +1% to +8% (8 levels give it)
orchards · game/common/buildings/00_standard_economy_buildings.txt
Manor Houses+8%
Province · culture with Polders, coastal
Levels 1–8: +2% to +8% (8 levels give it)
farm-estates · game/common/buildings/00_standard_economy_buildings.txt
Legendary Shrine+5%
County
legendary-shrine · game/common/buildings/00_legendary_buildings.txt
The Tower of London+5%
County
the-tower-of-london · game/common/buildings/00_special_buildings.txt
Hotin Fortification+5%
County
hotin-fort · game/common/buildings/00_special_buildings.txt
Aljafería+5%
County
aljaferia-palace · game/common/buildings/00_special_buildings.txt
Alcázar of Segovia+5%
County
alcazar-of-segovia · game/common/buildings/00_special_buildings.txt
Falak-ol-Aflak+5%
County
falak-ol-aflak-citadel · game/common/buildings/00_special_buildings.txt
Minaret of Jam+5%
County
minarets-and-remains-of-jam · game/common/buildings/00_special_buildings.txt
Hōshi Ryokan+5%
County
hoshi-ryokan · game/common/buildings/00_special_buildings.txt
City+4%
Province · culture with Republican Legacy or Parochialism
Levels 1–4: +1% to +4% (4 levels give it)
city · game/common/buildings/00_city_buildings.txt
Paddy Fields+4%
Province · culture with Champa Rice, in Terraced Hills
Levels 1–8: +2% to +4% (8 levels give it)
paddy-fields · game/common/buildings/00_standard_economy_buildings.txt
Paddy Fields+4%
Province · culture with Champa Rice, in Wetlands
Levels 1–8: +2% to +4% (8 levels give it)
paddy-fields · game/common/buildings/00_standard_economy_buildings.txt
Paddy Fields+4%
Province · culture with Champa Rice, in Floodplains
Levels 1–8: +2% to +4% (8 levels give it)
paddy-fields · game/common/buildings/00_standard_economy_buildings.txt
Cattle Pastures+4%
Province · culture with Pastorialists
Levels 1–8: +1% to +4% (8 levels give it)
pastures · game/common/buildings/00_standard_economy_buildings.txt
Cattle Pastures+4%
Province · culture with Polders, coastal
Levels 1–8: +1% to +4% (8 levels give it)
pastures · game/common/buildings/00_standard_economy_buildings.txt
Manor Houses+2%
County
Levels 6–8: +1% to +2% (3 levels give it)
farm-estates · game/common/buildings/00_standard_economy_buildings.txt
Farms & Fields+2%
County
Levels 2–8: +1% to +2% (7 levels give it)
cereal-fields · game/common/buildings/00_standard_economy_buildings.txt
Forestry+2%
County
Levels 5–8: +1% to +2% (4 levels give it)
logging-camps · game/common/buildings/00_standard_economy_buildings.txt
Desert Agriculture+2%
Province
Levels 2–8: +1% to +2% (7 levels give it)
plantations · game/common/buildings/00_standard_economy_buildings.txt
Forest Forts+2%
Province
Levels 2–8: +2% to +2% (7 levels give it)
ramparts · game/common/buildings/00_standard_fortification_buildings.txt

What lowers Holding Taxes (3)

Tenets (1)

Caritas-3%
Counties of this faith
tenet_philanthropia · game/common/religion/tenet_types/00_pam_tenets.txt

Buildings (2)

Herder Pens-80%
Province
herder-camp · game/common/buildings/00_nomad_buildings.txt
Official Almshouses-30%
County
Levels 1–4: -5% to -30% (4 levels give it)
oath-poor-building · game/common/buildings/99_ach_buildings.txt

Source: game/common/buildings/00_admin_buildings.txt, game/common/buildings/00_castle_buildings.txt, game/common/buildings/00_city_buildings.txt, game/common/buildings/00_duchy_capital_buildings.txt, game/common/buildings/00_legendary_buildings.txt, game/common/buildings/00_nomad_buildings.txt, game/common/buildings/00_special_buildings.txt, game/common/buildings/00_special_mines.txt, game/common/buildings/00_standard_economy_buildings.txt, game/common/buildings/00_standard_fortification_buildings.txt, game/common/buildings/00_standard_military_buildings.txt, game/common/buildings/00_temple_buildings.txt, game/common/buildings/99_ach_buildings.txt, game/common/buildings/ccp3_special_buildings.txt, game/common/buildings/cp6_special_buildings.txt, game/common/buildings/cp8_special_buildings.txt, game/common/buildings/pam_buildings.txt, game/common/buildings/temple_citadel_buildings.txt, game/common/buildings/tgp_great_project_buildings.txt, game/common/religion/faith_types/00_faith_types.txt, game/common/religion/tenet_types/00_pam_tenets.txt, game/common/religion/tenet_types/00_tenet_types.txt, game/common/traits/00_traits.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.