I'll be honest- I don't get the point of this request.
Though before reading into it I was imagining that it was a request to automatically send out bonds/gold. For example, you're the duke of war torn duchy with low income, but you yourself have suitable income and regularly send bonds to poor knights.
I would have more interest in this proposal instead:
Duke makes whatever amount per tax, and tax day automatically sends either set amounts or percentages out.
This could be the vodka talking though, and for that I apologize. Happy Holidays!
It is similar to having different bank accounts is what he is asking. As to certain amounts or percentages being sent out on tax day, it's called estates. If there is no direct thing like that, then it wouldn't be automatic, it would be through a bank.