Costs
Every expense answers three questions: when, where, and whose
Expense recording answers three questions about every cost: when it belongs, where it goes, and whose it is, with prepayments and accruals doing the timing work.
Most expense mistakes are not fraud or laziness. They are a payment recorded in the month the card was charged, coded to whatever account the software suggested last time, with a receipt nobody kept. Each of those is a separate failure, and each has its own fix.
Every cost that passes through a business has to answer three questions before it is properly recorded. When does it belong? Where does it go? Whose is it? Get those three right and the rest is data entry.
What to take away
- The date on the bank line tells you when money moved and nothing else. Prepayments and accruals are what put a cost in the period it belongs to.
- Coding is only worth doing well if a report will act on it. An account you would never make a decision from is a weekly judgment bought for nothing.
- Mixed personal and business spending is resolved at the point of entry, with the basis written down. A year-old mixed payment cannot be reconstructed by anyone.
When: the payment date is not the answer
The date on the bank line tells you when money moved. It does not tell you which period the cost belongs to, and under accrual accounting those are different facts.
Prepayment release across the year
- January$2,400 paid, $200 expensed, $2,200 asset
- February$200 expensed, $2,000 asset
- June$200 expensed, $1,200 asset
- December$200 expensed, nil asset
Two mechanisms bridge the gap.
A prepayment is money spent now for something you will consume later. Pay $2,400 in January for twelve months of cover and January did not incur $2,400 of cost, it incurred one month of it. The other eleven months are an asset: value you have bought and not yet used. Each month, $200 moves out of that asset and into the expense. (Invented figures, chosen because they divide neatly.)
| Cash out | Cost charged to the month | Asset still sitting on the balance sheet | |
|---|---|---|---|
| January | $2,400 | $200 | $2,200 |
| February | none | $200 | $2,000 |
| June | none | $200 | $1,200 |
| December | none | $200 | nil |
An accrual is the mirror image: value consumed now, invoice not here yet. The work was done in March, the supplier bills in April, the cost is March's. You post an estimate into March and reverse it when the real invoice arrives. It is the same timing argument the revenue recording guide makes on the income side, run in the other direction, and whether it applies to your books at all follows from the method they are kept under, set out in IRS Publication 538, Accounting Periods and Methods.
Neither is bookkeeping ceremony. Without them, a month that contains the annual insurance renewal looks like a disaster, the eleven quiet months look better than they are, and no month can be compared to any other.
The other timing question: is it a cost at all?
Some payments buy something that survives the period. A laptop, a van, a machine, a fit-out. Those are not consumed this month, so charging the whole amount to this month's profit understates every future month and wrecks one month.
Expense now or capitalise?
Does what you bought still have useful life next year?
balance sheet, charged gradually against profit
expense now, used up this period
The line between them is set partly by written policy and partly by rules that vary by jurisdiction and entity. In the United States the federal figure is the de minimis safe harbor: as the tangible property regulations record, the limit rose to $2,500, effective January 1, 2016, for a business without an applicable financial statement, while the larger amount for one with an applicable financial statement remained at $5,000. Spend above that on a laptop, a van or a machine is capitalised and its cost recovered under MACRS, with Section 179 and bonus depreciation as the elections that accelerate the write-off, and a change to the policy itself is requested on Form 3115.
IRS Publication 535, Business Expenses, sets out the United States federal position.
Find out which apply to you, record the figure in your procedures with the date you checked it, and apply the same test every time. Consistency matters more than where exactly you draw the line.
Repairs and improvements are the same argument in miniature. Fixing a thing to keep it working is usually a cost. Making it materially better or longer-lived is usually not. Borderline cases are worth an email to your accountant rather than a coin toss.
Where: coding that survives contact with a report
The chart of accounts exists so that a report can answer a question. Every coding decision should be made with that report in mind.
Coding rules that survive reporting
- Split direct costs from overheads
- Keep a category only if you would act on it
- Empty the miscellaneous account monthly
- Code the same thing the same way every time
- Change comparatives when you change a code
- Split direct costs from overheads.Costs that rise and fall with what you sell belong above the gross margin line; costs that are there whether you sell anything or not belong below it. Mixing them makes your margin meaningless, and margin is the number that tells you whether the model works.
- Keep a category only if you would act on it."Software" as one line is useful if you would renegotiate it. Fourteen separate subscription accounts are not fourteen decisions; they are fourteen places to make an inconsistent choice.
- Watch the miscellaneous account.Every business has one and every business's version grows. Anything in it is a cost you have decided not to understand. Empty it monthly; if a type of spend keeps landing there, it has earned a real account.
- Code the same thing the same way every time.A cost that moved between accounts in June will show as a trend that never happened. When you do need to change a code, change the comparative periods with it or note the change beside the report.
Whose: business, owner, and the space between
Business money and personal money mix in every small business, and the fix is procedural rather than moral.
The clean position is a separate business account with nothing personal going through it.
Where that is not fully achievable, resolve every mixed transaction at the point of entry, not at year-end. The business share is a cost, the personal share is drawings or a loan to the owner, and the split is written down with the reason.
Genuinely shared costs (a vehicle, a home workspace, a phone) need a documented basis for the split, applied consistently, with whatever record supports it. For a vehicle that basis is usually the IRS standard mileage rate or an actual-cost calculation; where an employee is reimbursed, the accountable plan rules decide whether the payment stays out of their wages. Whether a particular split is acceptable for tax purposes is not a bookkeeping decision. Record the facts and the basis; let your accountant decide what is claimable.
The receipt is not paperwork, it is the answer
A bank line says $340 went to a supplier. The document says what you bought, when it was supplied, how much of it was tax, and whether it was for the job you think it was. Only one of those two is evidence.
What a usable expense record holds
- Supplier's own document attached to the transaction
- Supply date as well as payment date
- Tax shown separately
- Note of business purpose where not obvious
- Link to the job or project
Card statements, bank feeds and screenshots of payment confirmations are not documents from the supplier. They prove money moved, which was never the part in doubt. A record that supports a deduction has to show the amount, the date, the place and the business purpose, and it has to be kept rather than rebuilt after the fact.
Recording is not deciding
Recording is factual: this document, this date, this account, this split. Evidence settles it, as the bookkeeping foundations guide describes.
Deductibility is not: whether a cost is allowable, how to treat a benefit provided to a person, how to write down an asset over time, and whether an arrangement is a lease or a purchase are advice. They depend on changing rules and are the accountant's call.
The most useful thing a bookkeeper can do at the boundary is keep a running list of the transactions they were unsure about, with the document attached and the question written out. That list turns a vague year-end review into a short, specific one.
A month-end pass that catches most of it
- The miscellaneous and uncategorized accounts are empty.
- Every prepayment has released this month's slice; every accrual from last month has been reversed against the real invoice.
- No purchase of something with a life beyond this year has been charged straight to expenses.
- Every expense over the threshold in your written capitalisation policy has its supplier document attached — if you have not set one, start from the de minimis safe harbor figure above.
- This month's expense report has been read next to the last two months', and anything that moved more than you expected has a known reason.
Common questions
How small is too small to accrue or prepay?
Our supplier invoices arrive weeks after the work. Does that break the month?
We pay for almost everything on one card. Where does that go wrong?
Is an emailed order confirmation good enough as a record?
What if we find something charged to expenses last year that should have been an asset?
In this guide
- Expense recording patterns: six situations, six different entriesSix expense recording examples worked through with entries: a late invoice, a staff claim, a supplier deposit, a foreign purchase, a mixed use item, a credit note.
- Expense recording framework: signal versus noise, 2027 editionAn expense recording framework of five gates every outgoing payment passes: what kind of thing, which period, which line, whose it is, and what proves it.
- Reading expense recording metrics without fooling yourselfExpense recording metrics track document coverage, accrual accuracy, recoding, holding-account age and entry lag; read them together, not as isolated scores.
- Expense recording trends: a card month-end routineExpense recording trends in card spend: the charge arrives before the document, so close each month by chasing evidence, policy, rules and renewals.
- Expense records for one quarter, and the four errors hiding insideAn expense recording case study: four invented errors in a quarter kept from the bank feed, the correcting entries, and the reshaped profit that came out of them.
