Concerned about an AI bubble? Sign up for The Daily Upside for smart and actionable market news, built for investors. Do you know how many federal income tax brackets there are? Seven, strictly speaking, with the lowest-earners paying 10% on income in the first bracket and the highest-earners paying 37% in the top bracket. Financial advisors often consider these brackets as clients amass wealth, but things get much more complicated when it comes to optimal retirement income planning, says Stuart Ritter, ...