Oh, you meant THAT trade. Sorry. I like to remember the Spurs getting rid of him a lot more than them acquiring him
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Bruno would know more about this than I would, but I think the snap shot date means the Spurs did not have to play taxes for the 2008-2009 season (or at least any extra tax due to Jefferson's deal). They didn't have to pay his salary that year, so it would surprise me if they had to pay the tax for it.
I don't think trading Bonner for more money in June would affect the tax payment for this season. I was more wondering about trade-exception rules when asking. If the rule still apply, then the Spurs can take back only about $4.6 Million (125 percent plus 100k). If they don't, then the Spurs can take back about 900k more. I don't think they have to worry about paying tax on the additional salary, either way.