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

SYDNEY, AUSTRALIA — Prime Minister Mark Carney is expected to take questions from reporters for the first time since embarking on a 10-day trip to India, Australia and Japan last week. It will be Carney’s first press conference since Feb. 17, when he announced the Liberal government’s new defence industrial strategy. He will take questions on Wednesday morning in Sydney, Australia, which translates to 4:35 p.m. ET on Tuesday. The prime minister has yet to field questions from reporters about strikes by the U.S. and Israel on Iran on Feb. 28, which killed Iran’s Supreme Leader...