🔑 How Does the Mega Backdoor Roth Two-Step Actually Work?

[George Blower]

I keep seeing “two steps” mentioned for the Mega Backdoor Roth. What are those steps, and what does each one require?

My Solo 401k Financial describes the Mega Backdoor Roth as a contribution step followed immediately by a conversion step. First, the participant contributes after-tax dollars to the voluntary after-tax account inside the Solo 401(k) — up to the 2026 annual addition limit of $72,000 (before catch-up). Second, those after-tax dollars are transferred to the Roth Solo 401(k) or to a Roth IRA. That conversion triggers a Form 1099-R reporting requirement.

The contribution step does not appear on the personal return, business return, or W-2. The conversion step does — but generates no taxable income because the dollars contributed were already after-tax.

My Solo 401k Financial prepares the Form 1099-R at no additional charge when clients (or advisors) timely submit the applicable transfer notification form.

👉 Full breakdown: Mega Backdoor Roth contribution and conversion steps explained for Solo 401(k) participants

See also: Voluntary after-tax contributions and the Mega Backdoor Roth using a Solo 401(k)

George Blower

My Solo 401k Financial

Contact

8004897571 mysolo401k.net