Retirement tax questions

Totally different.  401(k)'s are employer sponsored retirement accounts.   IRA's are personal accounts they each have their own limits.

See this IRS article for Roth contribution limits:

https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-ira-contribution-li...

**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**