403(b) / 457(b) Contributions: Can I contribute to both a Roth account and a traditional 403(b) account?

If your employer allows for Roth contributions within the 403(b) plan you can contribute to both a Roth account and a traditional 403(b) account at the same time but the contribution limits are combined. The 403(b) contribution limit for 2016 is $18,000 so for example if you contribute $9000 to the Roth account you can only contribute up to $9000 to the traditional account.