How to Do Bookkeeping for Multiple LLCs Without Mixing the Books

Why co-mingling is more than a bookkeeping problem

When entity A's card pays entity B's bill, two bad things happen. First, both sets of books are now wrong, and every report built on them is wrong too. Second — and worse — a pattern of co-mingled funds is exactly what an opposing attorney points at to argue your LLC is a formality that a court should ignore. The clean-books habit isn't bureaucracy; it's the substance behind the liability protection you're paying annual fees for.

The base layer: one bank account per entity

Every LLC needs at least its own checking account, and its own card. This is non-negotiable. The moment two entities share a card, you've signed yourself up for a monthly untangling session that only gets worse.

That said, real life happens: you're at the counter and the wrong card is in your hand. The fix isn't perfection — it's recording the mistake as what it is (an inter-company loan or reimbursement) the moment it happens, while you still remember.

Capture at the moment of purchase, tagged to the entity

The system that fails is the batch system: pile up receipts, sort them by entity 'later.' Later, the details are gone. Was that lumber for the rental LLC's roof repair or the flip project? In April, nobody knows.

The system that works is capture-at-purchase: photograph the receipt or record the expense right at the register, and tag the entity and property in the same breath. Ten seconds when you know the answer beats an hour in April when you don't.

• Record the expense the moment it happens — with the entity attached
• Photograph every receipt; thermal paper fades in months
• Log transfers between entities as loans or reimbursements, never as income
• Reconcile against bank statements monthly, not annually
• Give your CPA per-entity books, not one blended pile

Handling money that moves between entities

Transfers between your own LLCs are where books quietly go wrong. Money moving from your operating company to your property LLC is not income to the property LLC — it's a capital contribution or an inter-company loan, and it needs to be recorded that way on both sides. Pick the treatment (your CPA will have a preference), write it down, and apply it the same way every time.

What this looks like with BusiB

BusiB was built for exactly this structure: every business, LLC, property, and project keeps its own books, and you see one combined view across all of them. When you snap a receipt or tell Bea about a charge, you name the entity in the same sentence — 'the roof repair at Oakwood, that's Oakwood Holdings' — and it's filed against the right books. No per-entity subscriptions, no logging in and out of separate accounts, and per-entity reports are ready whenever a lender, partner, or CPA asks.