Money High-income retirement savers may have to pay tax now on catch-up contributions. Eventually. July 25, 2023July 26, 2023Medora Lee, USA TODAYComments Off on High-income retirement savers may have to pay tax now on catch-up contributions. Eventually. A plan to tax high-income, older Americans' catch-up 401(k) contributions is set to launch in January, but a myriad of issues could force a delay.