I couldn't find this question on here, and I've tried scouring the Internet, but to no avail. It's quite possible I'm just not searching with the appropriate keywords.
The question is regarding comma use in a sentence such as this:
I'm going out tonight, and, if you come along with me, we'll have a nice time.
Upon reduction, I (insubordinate) + C (conjunction) + S (subordinate) + I is the sentence structure. In my line of work, I commonly see I,CS,I. To me this seems incorrect. My belief is it should be I,C,S,I as above, unless the S is sufficiently small to allow for I,CSI.
Can anyone clarify this for me?
EDIT: Because the initial example was not the greatest, I've provided another to illustrate.
We're funding 5,500 to his Roth IRA, and, once we receive her permission, we'll be doing the same to hers.
Of note is the S is in no way nonessential, yet I feel all commas are necessary here. The second comma seems required with the inverted clause order