I assume that the "Roth account" you are talking about is a Roth IRA, because the limit on contributions to a Roth 401(k) does not depend on your income.
Use Worksheet 2-1 on page 39 of IRS Publication 590-A to calculate your MAGI for Roth IRA contributions. See "How Much Can Be Contributed?" starting on page 38 of Publication 590-A.
