Almost correct. However, total additions to the solo 401(k) are not permitted to exceed your net earnings of $27,881, so with a $23,500 Roth 401(k) contribution your employer contribution to the solo 401(k) is limited to $4,381. Alternatively, you could reduce your employee Roth 401(k) contribution to $22,305 and make the maximum employer contribution of $5,576. Including your Roth IRA contribution, the total contributions would be $34,881. The same earnings that support a Roth 401(k) can also support a Roth IRA contribution. (The same is not true for deductible 401(k) contributions.)
