Economic modifiers

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This article is accurate for the latest versions of EU3, Napoleon’s Ambition and In Nomine v3.2.
Please help update this page to include information on the HTTT and DW expansions.

To understand how the math works in Europa Universalis 3, you need to understand these things:

  • Percentage modifiers are additive, not cumulative
  • Flat modifiers are applied before percentage modifiers, unless specifically noted.


  • A core province with 8 base tax, in a nation with 0 stability, would mean the province yields:
    • 8 ducats monthly, going into investments
    • 8 ducats yearly going into the treasury


  • If stability rises to 2, revenue increases by 20%, raising the province's tax yield to 8 * 120% = 9.6.
  • If the nation is fully centralized (in IN), they get a 25% tax increase. The tax yield is increased by a total of 45%, bringing the province's tax value to 8 * 145% = 11.6.

Flat modifier

  • If a workshop is built, it adds 2 to the base tax. At 0 stability/centralization, the yield is 10, but at 2 stability/max centralization, the yield is 14.5 (an increase of 2.9 instead of 2).

How to evaluate effects

  • A percentage modifier is worth more if it modifies an already low percentage. +10 Trade Efficiency from National Trade Policy is worth more when your Trade Efficiency is 40 than when it is 90.
  • Flat modifiers is worth more when you also have other percentage modifiers.