Converting a Traditional 401(k) to a Roth IRA is taxable as ordinary income unless it is a 401(k) Roth (Designated Roth). You would need to ask the 401(k) plan administrator if it is ever permissible - not all plans allow that before retirement.
You can always have all or part of a regular Roth IRA in one financial institution rolled by direct trustee-to-trustee transfer to a different financial institution and that would be a tax-free rollover.
**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.**
