[wheelinsupial]

By no means am I an expert on this, but it looks like the sovereign grant is a tax refund paid to the crown from the taxes that the Crown Estate pays.

https://www.bbc.com/news/explainers-57559653.amp

[MagnumOpus]

The sovereign grant is paid to the Windsor family, not the Crown.

It is important to distinguish the "Crown" (essentially the monarchy-as-government) and the queens' family and hangers-on...