[Kaitiaki]

Neither the manual nor the game specify the formula that determines the money available for extensions. It is not the same as the formula used for free agents/current year contracts, which is what you quoted (and actually, the manual is misleading about that, because Proj. Budget Room already factors in payroll information; that doesn't need to be subtracted a second time).

Money available for extensions involves things like your expected payrolls for next season, which factors in contract estimates for any arbitration-eligible players you may have (estimates which are not displayed anywhere).

Honestly, with the information the game currently presents, there's no way you can really verify the accuracy of the money available for extensions. You just have to take it's word for it.

- Kai