"my question really is that do I need to let IRS know that we are operating as married single member LLC"
No. There is no such thing as a "married single member LLC". The IRS doesn't care who brings in the income. The IRS does not care if the single owner is married, single, divorced, or even dead. (Literally! no joke either!). The IRS only cares that the single owner of the business pay their taxes on that income. The way you word the question seems to indicate to me that you don't "quite" understand the concept of "single member LLC". You see, "WE" can't own a single member LLC. There is no WE in single member. There is only "I" own a single member LLC, or "you" own a single member LLC. No more than one person flat out no way, no how, under any circumstances, can own a single member LLC.
