Solo 401(k)s may prove valuable for business owners with no staff. These plans allow entrepreneurs to contribute as both employers and employees, providing a potential edge over other plans, write Robert Bloink and William Byrnes. “Solo 401(k)s also can provide a Roth contribution option to allow the saver to create a stream of tax-free income in retirement,” they note. ThinkAdvisor (free registration) (7/9)