I don't know exactly what you're doing but I'm using these numbers:
Tony Parker: $12,500,000
Tim Duncan: $10,361,446
Boris Diaw: $4,702,500
Danny Green: $3,762,500
Nando De Colo: $1,463,000
Kawhi Leonard: $1,887,840
Patrick Mills: $1,133,950
Cory Joseph: $1,120,920
Aron Baynes: $788,872
Splitter cap hold: $7,493,600
Ginobili starting salary of his new contract: $6,000,000
Roster cap hold: $490,180
Total: $51,704,808
So, with a $62M cap space, it's $10.3M of space. $8.3M with a $60M.
And it's assuming Spurs amnesty Bonner and stash or trade their first round pick.