seigniorage

noun3

1. •
   The revenue obtained directly by minting coin (difference between face value and cost of metal).

   • The old kingly prerogative of altering the coinage was taken away, the unit of the currency was declared definite and unchangeable, and the seigniorage on minting was abolished. — 1896
2. •
   The revenue obtained by the difference between interest earned on securities acquired in exchange for bank notes and the costs of producing and distributing those notes.
3. •
   (historical) All the revenue obtained by a feudal lord from his vassals.

   • I will tell you. First, he comes regularly to take his rights of seigniorage, his rents, his taxes, his fourths of all the produce of his vineyards and arable lands on our Côte d'Or. — 1895