History. 1  Map of Canary Wharf area in 1899 showing West India Docks and the Isle of Dogs. 2  Canary Wharf aerial view (2009), from the southeast end of the Isle of Dogs, showing the Millwall Dock. 3  Canary Wharf, view east from Cabot Square. 4  London City Airport runway with Canary Wharf and the O2 Arena in the background.
By Investopedia AAA |. A: The main difference between a Roth 401(k) plan and Roth individual retirement account (IRA) is that the 401(k) is offered by an employer as a defined contribution pension, while the IRA is sought out by the individual.y Investopedia AAA |. A: The main difference between a Roth 401(k) plan and Roth individual retirement account (IRA) is that the 401(k) is offered by an employer as a defined contribution pension, while the IRA is sought out by the individual.
The only difference is that IRAs have much lower contribution limits than 401(k)s. In 2015, you can put up to $18,000 into a 401(k) (or up to 23,000 if you are age 50 or older) and $5,500 in an IRA (or up to $6,500 with the catch-up contribution).01k Plus Roth IRA. If you are making regular contributions to a 401k and are looking for another way to save even more retirement dollars, a Roth IRA is a great choice. Investors who qualify can contribute to both a 401k and a Roth IRA in the same year, and there are good reasons to do so.