Atomization energies at 0 K and heats of formation at 0 and 298 K are predicted for XeF3+, XeF3-, XeF5+, XeF7+, XeF7-, and XeF8 from coupled cluster theory (CCSD(T)) calculations with effective core potential correlation-consistent basis sets for Xe and including correlation of the nearest core electrons. Additional corrections are included to achieve near chemical accuracy of +/- 1 kcal/mol. Vibrational zero point energies were computed at the MP2 level of theory. Unlike the other neutral xenon fluorides, XeF8 is predicted to be thermodynamically unstable with respect to loss of F-2 with the reaction calculated to be exothermic by 22.3 kcal/mol at 0 K. XeF7+ is also predicted to be thermodynamically unstable with respect to the loss of F-2 by 24.1 kcal/mol at 0 K. For XeF3+, XeF5+, XeF3-, XeF5-, and XeF7-, the reactions for loss of F-2 are endothermic by 14.8, 37.8, 38.2, 59.6, and 31.9 kcal/mol at 0 K, respectively. The F+ affinities of Xe, XeF2, XeF4, and XeF6 are predicted to be 165.1, 155.3, 172.7, and 132.5 kcal/mol, and the corresponding F- affinities are 6.3, 19.9, 59.1, and 75.0 kcal/mol at 0 K, respectively.