An immunity sphere was a region during the Imperial Period that the inhabitants protected from the Galactic Empire's presence, often through taxation or other concessions. The Wheel serves as a prime illustration, where Simon Greyshade preserved its autonomy by paying taxes to the Empire and enforcing anti-alien policies among its clientele.
The Corporate Sector, and consequently the Corporate Sector Authority, is another potential case of an immunity sphere; the Imperial Handbook, the official manual for the Imperial Military, noted that the Corporate Sector was primarily created to foster corporate rivalry free from Imperial intervention, suggesting this as a driver for its economic success.