As I understand it, I can contribute up to $17,500 to my 401(k) per year and $5,500 to my personal Roth IRA.Thanks, -- Matt MorassDear Matt, Having a Roth 401(k) plan at work doesn't limit your ability to contribute to your personal Roth IRA.s I understand it, I can contribute up to $17,500 to my 401(k) per year and $5,500 to my personal Roth IRA. Thanks, -- Matt Morass. Dear Matt, Having a Roth 401(k) plan at work doesn't limit your ability to contribute to your personal Roth IRA.