You can always make an estimated payment under your social security number since all the business EINs are connected to the SSN.
Side note:
Struggling with the word "WE". "We, going forward, will be operating under a single member LLC structure"
WE isn't possible on a sch C that is a sole proprietorship. If you are in a community property state, you each file your own Sch C and split everything 50/50 (if you meet the rules). If you are not in a community property state, you are a partnership, S-corp, business.
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