Like a communist economy is the best I can think off, but in fantasy terms I don't see how inflation can work.
A Dragon keeps all it's money to itself, mages create items from nothing or transmutes them. Worse of all, Inheratance tax (something I Don't agree with in this country anyway) How would that work. You live, you earn money & pay tax, go out and find a monsters lair, take their money, go back home & get another tax audit! A mage who's life you saved makes you a nice magical weapon, you get taxed on it. Then you die on an adventure, leave all you stuff to your family and they get taxed on it....... Then a nice priest brings you back from the death, what then, a Re-living tax and a tax on getting your stuff back again? Just not fair. Would you need another tax number, as the one you had now belongs to a dead person, but with a new number at your age, you must have not been paying taxes before, so they arrest you and lock you up for non-payment of taxes Just seems like there is no way to win