I have been curious about this since I started playing the game again with HttT. It seems that the Banker advisor, the one that reduces interest, doesn't work; that or I misunderstand how it does work.
I accidentally took out a loan. The interest was 1.9/month. I used my cultural tradition to hire a level 5 Banker (-5% Interest). After 2 full months I am still paying 1.9/month in interest. The rest of the numbers seem to add up, so it doesn't seem to be an interface issue.
I have a save if someone want to see it or decides it is a bug.
I accidentally took out a loan. The interest was 1.9/month. I used my cultural tradition to hire a level 5 Banker (-5% Interest). After 2 full months I am still paying 1.9/month in interest. The rest of the numbers seem to add up, so it doesn't seem to be an interface issue.
I have a save if someone want to see it or decides it is a bug.