Most founders build an elaborate bookkeeping system in the first month and stop maintaining it by the third. Then in April they reconstruct a year from bank statements, guessing at what half the payments were for. Good LLC bookkeeping for a one-person company is a system simple enough that you are still using it in month seven.
The useful question is not what the best system is. It is what system you will still be using in month seven, because a simple record kept consistently is worth more than a sophisticated one kept for six weeks.
What LLC bookkeeping records are actually for
Bookkeeping feels like an obligation imposed from outside. It is easier to maintain once you can name the four occasions it gets used, because each one is a moment where good records save you something concrete.
Your annual filings. For a foreign-owned single-member LLC these ask for totals of money moving between you and the company. With a log it is an evening's work. Without one it is a reconstruction.
A bank or processor review. When an account is reviewed or a payment held, what releases it is evidence — an invoice, a contract, a record of delivery. Producing it in ten minutes is a different experience from searching for it over three days.
Demonstrating the company is separate from you. The liability protection depends on the company being genuinely distinct. Records are a substantial part of what evidences that.
Knowing whether the business works. The least regulatory and most valuable. A founder who cannot say what the company earned last quarter is making decisions on feel.
The four things worth recording
Everything else is refinement. These four cover the obligations and most of the usefulness.
- Money in. Date, amount, currency, who paid, what for, which invoice.
- Money out. Date, amount, who was paid, what for, a category.
- Movements between you and the company. Date, amount, direction, purpose. This is the one with the filing consequence.
- Documents. Invoices issued, receipts for anything meaningful, contracts, and the annual statements from each account.
The owner log, which matters most
Of the four, the third is the one founders skip and the one that costs the most to skip.
Money moving between you and your own LLC is reportable on an annual information return whose penalty is substantial and is not scaled to the amounts involved. The return asks for totals in each direction. If you have the log, you read off two numbers. If you do not, you are going through a year of statements deciding which personal card charges were company expenses, months after the fact.
What belongs in it is broader than people assume. The state filing fee paid on your personal card. The registered agent renewal. The domain. Money you transferred in to cover costs. Anything you took out. A loan to the company, even an informal one with no paperwork.
Four columns, one row per movement. It takes seconds at the time and is close to impossible to reconstruct accurately later. The obligation it feeds is explained in the penalty most foreign LLC owners never see coming.
Spreadsheet or software
| Spreadsheet | Accounting software | |
|---|---|---|
| Cost | Nothing | $10-$40 a month |
| Setup effort | An hour | A day to do properly |
| Bank feeds | Manual entry | Automatic in most cases |
| Multi-currency | Painful | Handled |
| Invoicing | Separate tool | Built in |
| Accountant access | Send a file | Direct access |
| Best for | Low volume, one currency | Growing volume, several currencies |
For a consultant issuing four invoices a month in one currency, a spreadsheet is genuinely adequate and the monthly software fee buys little. For a store processing hundreds of transactions across several currencies, manual entry stops being viable quickly and the software pays for itself in recovered evenings.
The honest advice is to start with a spreadsheet and move when it becomes annoying. Starting with software you do not need is how people end up paying for a subscription they stopped opening.
Separate accounts, without exception
One rule that is not worth compromising on: company money goes through company accounts and personal money does not.
This is not bookkeeping tidiness. The protection an LLC provides depends on the company being genuinely separate, and freely mixing funds is the clearest available evidence that it is not. It also makes every other part of this simpler, because the company account statement becomes a near-complete record by itself.
Paying yourself is not a violation of this. Transfer from the company account to your personal account, record it in the owner log, and it is a distribution properly made. What causes problems is paying a personal expense directly from the company account, or taking customer payments into a personal one.
In the early weeks, before the company account exists, some mixing is unavoidable. Record those payments as what they are and settle them once the account opens, rather than leaving them undocumented.
Currency, where small errors accumulate
Most readers here earn in dollars and live somewhere that uses another currency, which makes this unavoidable.
Record the transaction in the currency it happened in, and record the rate you actually got rather than a published rate for the day. The difference between the two is the provider's margin, and it is a real cost of doing business that disappears from your records if you use the wrong number.
Conversion costs are worth tracking as their own category rather than being absorbed invisibly into every transaction. Founders who do this are often surprised at the annual total, and it frequently justifies holding a multi-currency account rather than converting on every payment.
A routine that survives contact with a busy month
Weekly, fifteen minutes. Enter the week's transactions. Categorise them. File any invoices or receipts. Do it while you still remember what each payment was.
Monthly, half an hour. Reconcile against the account statement — every line on the statement should appear in your records and vice versa. Chase anything unpaid. Note the closing balance.
Quarterly, an hour. Look at the numbers rather than just recording them. Revenue, costs, what is actually profitable. Check the owner log is complete.
Annually. Produce the totals for the filings, send whatever your accountant needs, archive the year.
The weekly fifteen minutes is the one that carries the whole system. Skip it for a month and the monthly reconciliation becomes an afternoon, at which point it gets postponed, and the system is effectively abandoned.
Receipts, and how much to keep
Keep the digital record of anything meaningful. Photograph paper receipts immediately, because they fade and are lost, and store them in one folder organised by year and month.
The judgement is about proportion rather than rules. A subscription with a monthly emailed invoice is well evidenced already. A significant equipment purchase deserves the receipt kept carefully. A two-dollar charge does not need ceremony, though it still needs to appear in the records.
Storage is cheap enough that the simplest policy is to keep everything and never think about it again. What to retain and for how long is covered in what records to keep and for how long.
Invoices that prevent arguments
Your invoices are both a payment request and evidence, and the second role is the one that matters when a payment is disputed or an account reviewed.
Each should carry a unique sequential number, the date, your full legal entity name and address, the client's name and address, a specific description of what was delivered, the amount and currency, payment terms, and payment details.
The description is where founders under-invest. "Consulting services" tells a reviewer nothing. "Website redesign, milestone 2 of 3, delivered 14 March" tells them exactly what was sold and when, which is precisely what resolves a dispute in your favour.
What an accountant is for
Doing your own bookkeeping does not mean doing your own tax. They are different jobs and the second has consequences the first does not.
A sensible division for a small foreign-owned company is that you keep the records through the year and an accountant handles the annual filings. That is usually a few hundred dollars for a straightforward company and removes the risk that carries the largest penalties.
The better your records, the less the accountant costs, because you are paying for judgement rather than for data entry. A founder arriving with a clean spreadsheet and a complete owner log is a cheaper client than one arriving with a folder of statements.
Catching up when you are behind
Most people reading this are not starting fresh. They are several months behind and putting it off because the task feels enormous.
Work backwards from the most recent month rather than forwards from the start, because recent transactions are the ones you still remember and the ones most likely to matter. Do one month per sitting. Accept that some older entries will be approximate and mark them as such rather than pretending to a precision you do not have.
Prioritise the owner log above everything else. If you only reconstruct one thing, reconstruct the money moving between you and the company, because that is the part with a filing obligation and a penalty attached. Ordinary business expenses are a matter of accuracy; that one is a matter of compliance.
Categories worth using, and the trap of too many
A category is simply a label saying what a payment was for, and the instinct on setting them up is to be thorough. Resist it. A founder with forty categories stops categorising accurately within two months, because every entry becomes a decision.
For most one-person companies, eight to twelve categories cover everything that matters. Software and subscriptions. Professional fees, meaning the accountant, the lawyer and the registered agent. Government and filing fees. Marketing and advertising. Contractors and freelancers. Bank and payment processing charges. Currency conversion. Equipment. Travel, if you have any. And a general one for the genuinely miscellaneous.
Two rules make categories useful rather than decorative. Be consistent, because the same expense landing in three different places over a year makes the totals meaningless. And let the categories reflect decisions you might actually make — the reason to separate payment processing fees from bank charges is that seeing a large annual total for one of them might change which provider you use. A category that would never change anything is one you can merge into something else.
The short version
Record four things: money in, money out, movements between you and the company, and the documents behind them. Keep accounts genuinely separate. Spend fifteen minutes a week rather than three hours a quarter. Start with a spreadsheet and move to software when it becomes annoying rather than before.
The owner log is the piece with a real penalty attached and the piece most often skipped. If you build only one habit from this, build that one. What it feeds into is in Form 5472 for a foreign-owned LLC, and if you would rather have the structure set up with this in place from the start, it is part of our formation service.
If you would rather have this handled for you, our US LLC formation service covers it end to end. For the official position, see IRS: recordkeeping.