If you're a high earner looking to save more for retirement in a tax-smart way, the mega backdoor Roth could be a game-changer. This powerful strategy lets you contribute tens of thousands of after-tax dollars to a Roth account—far beyond the usual limits. Learn how it works, what your 401(k) plan must allow, and why timing matters to avoid taxes. It’s a hidden gem for those already maxing out traditional retirement options.