Before Mitt Romney retired from Bain Capital, the enormously profitable investment firm he founded, he made sure to lock in his gains, both realized and expected, for years to come.

He did so, in part, the way millions of other Americans do — with the tax benefits of an individual retirement account. But he was able to turbocharge the impact of those advantages and other tax breaks in his severance package from Bain in a way that few but the country’s super-rich can ever hope to do.

Although this was technically legal, most Americans would have no problem with the IRS going after him for abusing the spirit of the law.