As a husband, do I need power of Atty? Wife is I'll.

If you have access to all bank and investments account (joint owner or authorized user) and if you don't own your car jointly, you may not need a Power of Attorney.  I think its always a good idea to have one, because no matter how careful you are, there will be osme asset or something for which the POA is needed.  The car is a good example.  If you both jointly own the car, you cannot sell without her signature.  Usually a Power of Attorney is relatively inexpensive.  If you can bring your wife to a lawyers office, it could probably be odne immediately for about $150.  Good luck.