What a foreign-owned LLC actually has to keep records of.

A foreign-owned US LLC with no employees, no office, and modest revenue can feel too small to need real bookkeeping. The company's own tax filing obligation disagrees. If you are required to file Form 5472, and most foreign-owned single-member LLCs are, the form exists to disclose transactions between the LLC and its foreign owner, which means those transactions have to be identifiable and documented in the first place.

The records Form 5472 actually needs behind it

• Every capital contribution from the owner into the LLC, including the initial funding that paid for formation itself.
• Any loans between the LLC and the owner, in either direction, with dates and amounts.
• Payments for services or goods between the LLC and its owner or related parties.
• Distributions paid out of the LLC to the owner.

These need to be identifiable transaction by transaction, not summarised as a single "owner activity" line at year end. If the IRS ever asks how a reported figure was calculated, the underlying records are what answers that question, not the return itself.

Why this is not the same as personal bookkeeping

The instinct many founders have is to treat the LLC's bank account like a slightly more formal personal account, moving money in and out as needed and reconciling loosely at tax time. For a foreign-owned LLC with a real disclosure obligation, that approach makes reconstructing a compliant Form 5472 after the fact expensive and sometimes impossible if records were never kept contemporaneously.

What actually needs to be in place

• A dedicated business bank account, separate from personal funds, from day one.
• Every transaction categorised as it happens, not batched months later from memory.
• Contributions, loans, and distributions specifically flagged as such, since these are the categories Form 5472 asks about directly.
• Records kept even in a year with zero revenue, since the filing obligation is not tied to profit.

None of this needs to be complicated. It needs to exist, consistently, from the point the LLC is funded, because the alternative is reconstructing a year of transactions from bank statements under time pressure the week a filing is due.