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aitaituo

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Add your capital province to the HRE. There's a button in the province menu. If it says you're too big, improve relations with the Emperor and/or lose some provinces.
 

Saintrl

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Adding to above, a common practice is to sell your provinces to vassals or release vassals when possible. You could also just move your capitol province to an HRE province if you're too lazy to do that. :)
 

HappyMephisto

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AFAIK there is no fixed limit to the base tax. The game just compares the power of the new nation to the power of the emperor. That's why big, scary, economical powerhouse Venice can't into HRE but Poland with massive army and tax but no to negligible trade can.
 

TheBloke

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AFAIK there is no fixed limit to the base tax.

There is a fixed limit to Base Tax.

Venice can by releasing crete... isn't a matter of number of provinces ?

Not specifically - it's Base Tax. Five provinces of 6 Base Tax each (30) is the same as ten provinces of 3 Base Tax each.



Rules and requirements for adding yourself to the HRE:
  1. Your capital must border the existing HRE.
  2. You click the Add to HRE button on that capital.
  3. You can only click this button if your relations with the current emperor are: 100 + (2 * SumOfProvinceBaseTax)
    • SumOfProvinceBaseTax = go through each of your provinces, and add up the gross Base Tax of each province.
      • That is the Base Tax Value shown in top left of Province interface.
      • Example: In 1444, London's Base Tax is 12.
    • This is does not take into account any modifiers - not Temples or Stock Exchanges, not any ideas/technology/anything that would normally increase Tax, and not the Base Tax of your subjects.
      • It is possible to get Events that will permanently increase the Base Tax of a province - I believe this will count; the new Base Tax of that province after Event would be the value used.
    • FYI, SumOfProvinceBaseTax is the same calculation used for:
      • the DipVassalisation hard cap (max 40 Base Tax cap on DipVassalising a nation)
      • The Religious Unity percentage calculation, which compares SumOfProvinceBaseTax of provinces of your faith versus overall.
    • It is not the same as the following, which both take into account Tax buildings and potentially other modifiers:
      • Tax Base, shown on the Economy screen - and which is the figure used for new the 25 'Base Tax' limit on Vassalisation Missions.
      • Base Tax diplomatic modifier used for Dip Vassalisation.
  4. The formula of 100 + (2 * SumProvinceBaseTax) sets a hard limit on your size of 50 Province Base Tax, which would require +200 relations with Emperor; +200 being the maximum relations you can have.
  5. An example, to give you a guide on the size:
    • Denmark starts in 1444 with a sum of province Base Tax of: 33
    • Meaning they need relations with the Emperor of at least: +166
 

HappyMephisto

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There is a fixed limit to Base Tax.



Not specifically - it's Base Tax. Five provinces of 6 Base Tax each (30) is the same as ten provinces of 3 Base Tax each.



Rules and requirements for adding yourself to the HRE:
  1. Your capital must border the existing HRE.
  2. You click the Add to HRE button on that capital.
  3. You can only click this button if your relations with the current emperor are: 100 + (2 * SumOfProvinceBaseTax)
    • SumOfProvinceBaseTax = go through each of your provinces, and add up the gross Base Tax of each province.
      • That is the Base Tax Value shown in top left of Province interface.
      • Example: In 1444, London's Base Tax is 12.
    • This is does not take into account any modifiers - not Temples or Stock Exchanges, not any ideas/technology/anything that would normally increase Tax, and not the Base Tax of your subjects.
      • It is possible to get Events that will permanently increase the Base Tax of a province - I believe this will count; the new Base Tax of that province after Event would be the value used.
    • FYI, SumOfProvinceBaseTax is the same calculation used for:
      • the DipVassalisation hard cap (max 40 Base Tax cap on DipVassalising a nation)
      • The Religious Unity percentage calculation, which compares SumOfProvinceBaseTax of provinces of your faith versus overall.
    • It is not the same as the following, which both take into account Tax buildings and potentially other modifiers:
      • Tax Base, shown on the Economy screen - and which is the figure used for new the 25 'Base Tax' limit on Vassalisation Missions.
      • Base Tax diplomatic modifier used for Dip Vassalisation.
  4. The formula of 100 + (2 * SumProvinceBaseTax) sets a hard limit on your size of 50 Province Base Tax, which would require +200 relations with Emperor; +200 being the maximum relations you can have.
  5. An example, to give you a guide on the size:
    • Denmark starts in 1444 with a sum of province Base Tax of: 33
    • Meaning they need relations with the Emperor of at least: +166

Oops. Pretty informative though, thank you. :)