My accountant went quiet when I said I paid for everything with the same debit card

I set up entities before I bought anything, because that's the part of this I find interesting. One holding LLC, two child LLCs, an operating agreement I actually read and marked up. I was pleased with myself.

Then I bought a small rental in one of the child entities, and for about five months I paid for things with whatever card was in my wallet. New locks, a lockbox, the gutter guy, the insurance binder. Sometimes it was the entity card. Sometimes it was my personal card and I meant to sort it out later.

I brought all of it to an accountant in January in a folder, feeling organized because the folder was organized.

She went through it and then asked me which entity owned the property. I told her. She asked which entity's bank account had paid the gutter guy. Long pause on my end. Then she asked whether the holding company had ever documented lending money to the child, because on paper that's what some of these payments looked like.

What I learned is that the structure I was proud of only exists in the books. The operating agreement is a document. The separation is a bank statement. If the money moves without a record of why, the paperwork isn't doing the job I built it to do.

Whether any of that actually affects liability protection is a lawyer question and mine was careful not to promise me anything. But the bookkeeping side was plain enough. I now have one card per entity and I don't carry two of them at the same time.