Portrait, black man on mountain and excited with exercise, celebration and view for fitness, happiness and hiking. Face, African American male athlete and mature gentleman with smile and traininggettyThis little-known Roth strategy can help high income earners save 100’s of thousands more in tax-free retirement income - if you know how to use it.Roth IRAs have long been a favorite among savers who want tax-free growth, but for high income earners, contribution limits can feel like a ceiling. Cue the Mega Ba ...