What it is

A move that lets you put up to ~$46,500 in after-tax dollars into your 401(k) and immediately convert it to Roth — if your plan allows it.

What it really means

The single most powerful retirement lever available to high-income W-2 employees. About 40% of large-company plans allow it. Nobody at HR will tell you unless you ask.

See also

• Backdoor Roth
• 401(k)