Once again, I call BS. What do you mean by "illegal per se"? I've never heard a Judge use those words. It's either illegal or it's not. In this case, not only is it not, it's not even near the point of being arguable.
It's not illegal in that there is no law against it, but it's not best practices in a commercial setting, as I clear indicate after the portion of my post that you quote. The bank is clearly and correctly protecting their interests.
Being a single member LLC has exactly zero to do with internal financial controls or segregation of duties. It only indicates ownership share. You assumed a lot about this particular business before it was confirmed after the fact. I presented my advice assuming nothing. I don't know how large the check is for, the number of people the LLC employs, revenue level, profit, if there are plans for expansion, plans for a loan or line of credit, etc. etc. etc. If this company requires an audit or review and I am the firm he/she hires, this perks my ear and I am going to investigate a little further. Things fall through the cracks sometimes, even for the most well intentioned. What if this check fails to make it into the financials? The accounting firm not only have a duty to serve the client, but all the potential users of the report. If the result is no big deal, great. It's still something I'll make note of.
What is a "potential bankruptcy lawsuit"? Do you mean a civil lawsuit for breach of contract against the owner of the LLC based on the argument that the LLC was not properly structured and run? Certainly co-mingling of personal and business assets would be grounds for such an argument. But negotiation of a check to another person is not co-mingling under even the loosest interpretation of "co-mingling." This is a loser argument that wouldn't make it past a motion for judgment on the pleadings.
Potential: (adj) Possible, as opposed to actual
Bankruptcy: Iz gotz no more dolla billz
Lawsuit: is a civil action brought in a court of law in which a plaintiff, a party who claims to have incurred loss as a result of a defendant's actions, demands a legal or equitable remedy.
On the contrary, the action of depositing money meant for a commercial business into a personal account is the very definition of comingled funds. Again, what if the transaction is never recorded in the financials? You're not going to catch it in your business account rec. The money never hit it. If an individual makes a personal check out to you and you endorse it over to another individual, knock yourself out. It's a practice that I would strongly discourage in a commercial environment.
The usual course would be to deposit the check payable to the LLC into an LLC checking account and then transfer the money to the personal account. By negotiating the check to the individual, the deposit-then-transfer step is skipped. Unless you can cite a legal source that says that this reduces or eliminates the liability protection offered by the LLC, then you are, again, afraid of goblins and just bloviating because you don't know the law and it's easier to give advice that you know is "safe" then to take the time to learn what the law is and give advice that might be more useful to [your clients].
See:
Funds, Comingling thereof, above.
Yes, as an industry, most public accountants tend to be conservative, but my bloviating has nothing to do with what is safe. It has to do with what is generally accepted in a commercial environment and best practices vis a vie internal controls.
Jesus man, he's a single member LLC. It's impossible to have a "segregation" of duty for internal control. Wow.
You didn't know that until 3:42 and no it's not. As I said before, a single member LLC does not indicate number of people on the payroll.
FYI, there are still best practices for a sole proprietor...