A Roth 401k is a retirement savings account, offered to you as an employee of BRC. Any contributions you elect to make will be deducted from your paycheck post-tax, which means you will pay Income Tax on those amounts.
Be aware, there are some restrictions and penalties incurred if you withdraw money from your Roth 401k before age 59 ½, such as withdrawing before having the money in your account for 5 years or more.
In all matters relating to your Roth 401k and retirement, it is recommended that you consult with your tax professional.
For more information please visit the IRS website.