High-income retirement savers may have to pay tax now on catch-up contributions. Eventually.

It’s an incident that tells you a lot about John Candy. He was hard at work on Only the Lonely, the 1991 film that would help affirm his credibility as a dramatic actor. But it also marked an occasion when the famously affable Candy lost his cool when he realized that his legendary co-star, Maureen O’Hara, was not receiving the respect she deserved. His top billing and seven-figure salary ensured luxury treatment for Candy during the shoot. That included the provision of an opulent trailer on location. Such was not the case for O’Hara: despite her status as a reigning queen of...