Worked example
One messy supplier invoice: from a photograph to a defensible entry.
Illustrative worked example. Not a customer case study. The studio, the supplier, the references and the figures below are invented. The shape of the problem is entirely ordinary — most businesses generate one of these a month.
One supplier invoice arrived that could not be recorded correctly from anything printed on it. It was held for nine days. One question went to one person. One sentence came back, and the invoice was recorded — with the question, the answer and the document kept attached to the entry. None of that is a process failing. The failure mode is the other one: an invoice like this recorded confidently on the day it arrived.
A photograph of an invoice, forwarded twice. Everything it settled, and everything it did not.
Fairwater Studio is an invented fourteen-person design and research practice. Kelso Technical Services is an invented supplier that has done work for it before. Figures are shown without a currency; nothing in the example turns on which one it is.
What landed was a phone photograph of a printed invoice, forwarded by a project manager, originally sent to a colleague who had left four months earlier. It was legible. It was also, as an accounting instruction, incomplete.
| On the face of the invoice | What that settled | What it left open |
|---|---|---|
| “Kelso Technical Services · Invoice 2214 · 31 March” | Who issued it, and its reference | It arrived on 12 June. Eleven weeks between the two, and a closed quarter in between. |
| Addressed to “Fairwater Ltd” | Nothing reliably | The studio has never traded under that name. A wrong addressee is either sloppiness or the wrong company entirely. |
| “Ph2 retainer — Q1” · 3,600 | An amount | Whose phase two? The studio’s internal phases and the supplier’s do not obviously align. |
| “Site attendance × 2” · 900 | An amount | Which engagement the attendance served, and whether it was rechargeable to the studio’s own client. |
| “Materials as agreed” · 480 | An amount | Agreed with whom, and against what. “As agreed” is a reference to a conversation nobody can produce. |
| “Less deposit held 40%” · −1,800 | That the supplier believes it holds money | The three line items total 4,980. Forty per cent of that is 1,992, not 1,800 — so the deposit relates to some other number. |
| “Total due 3,180 · terms as agreed” | What to pay | When to pay it. |
Note what is not in doubt: the amount payable. 3,180 is on the face of the document. Everything unresolved here is about meaning, not money owed — and those two questions have different deadlines.
Three ways to record it. Only one was right, and the invoice did not say which.
The bookkeeping work started with retrieval, not with a question to the studio. The supplier account showed a payment of 1,800 made to Kelso on 14 November, held since then as a prepayment — money paid ahead of work not yet done. That single record explained the arithmetic: 1,800 is forty per cent of 4,500, the original quoted value of a phase that had later grown.
It did not settle the treatment. Three readings remained live, and they produce three different sets of books:
| If the deduction is… | The entry becomes | And the consequence is |
|---|---|---|
| A deposit already treated as a cost when it was paid | A cost of 3,180 now | Correct only if November was recorded that way. If it was not, cost is understated by 1,800 and an asset sits on the balance sheet permanently. |
| A prepayment paid against this work | A cost of 4,980, clearing the 1,800 prepayment, with 3,180 payable | The project’s true cost appears for the first time, and the November balance finally comes off the books. |
| A credit Kelso is applying from a different job | A cost of 4,980, with 1,800 moved off another engagement | Two projects both report the wrong margin — and there may be an unbilled phase-one invoice still to come. |
The deciding detail was three characters long. The line said “Ph2”, and the deposit had been paid against phase one. Either the supplier had numbered its phases differently from the studio, or this invoice was for later work entirely — in which case an earlier invoice was missing and the studio was carrying a liability it did not know about.
One question, to one person, about one thing.
What was sent was not “please explain this invoice”. It went to the studio’s operations lead — who had commissioned Kelso, and was the only person who could answer — and it named everything already established, so that answering it required no research:
Three properties make that a good question rather than a burden. It is answerable in one sentence. It states what has already been done, so the recipient is not asked to redo it. And it goes to the one person who holds the fact — not to the founder, who would have had to forward it anyway.
Nine days passed. Six of them were on the studio’s side: the operations lead was away, which is ordinary and worth stating plainly rather than dressing up. During those nine days:
- The invoice was logged as received, with its date and reference, so it existed somewhere other than a photograph in a thread.
- It appeared on the studio’s open-items list as one line: what was needed, from whom, and since when.
- It was not posted to a plausible account to keep a list short, and not left out of view because it was unresolved.
- The payment was prepared anyway. The amount payable was never in question, so 3,180 went into the normal run for the studio to review and release. An unsettled treatment is not a reason to pay a supplier late.
That last point is the one people expect to go the other way. Holding a treatment open and paying on time are not in tension — they are two different questions that happen to share a document.
Recorded — and the eight things kept with it.
The answer came back in one line: “Phase one was renumbered after the January scope change. Kelso’s Ph2 is our phase one. Nothing else is outstanding.” That settled it. The invoice recorded a cost of 4,980; the 1,800 prepayment carried since November cleared against it; 3,180 stayed payable and was released by the studio on the next run.
One further judgement was needed, and it was not hidden. The work belonged to a quarter that had already closed and been reported on. Rather than quietly reopening a period somebody had already relied on, the cost was recorded in June with a note stating the period it related to and why it arrived late — visible in the reporting rather than smoothed out of it.
What stayed attached to the entry afterwards:
- The original photograph, and the email chain that forwarded it.
- The supplier, the invoice number and the invoice date, as issued.
- The November payment record and the prepayment it created.
- The question that was asked, who it went to, and when.
- The answer, in the words it was given in.
- The treatment applied, and the reason for it in one line.
- The date it was recorded, and the note explaining the period it belonged to.
- A standing note on the supplier record: Kelso numbers phases from its own quote, not ours.
The last item is the one that compounds. A question answered once should never need asking twice, and the difference between a provider that improves month by month and one that does not is largely whether answers are kept where the next person will find them.
Where At Par fits — and the limits.
This is ordinary At Par work, not an exceptional case. Documents arrive however they are easiest to send. What can be established from records is established first. What cannot is raised as one specific question to the person who holds the answer, while the item stays visible rather than being posted to something plausible. When it resolves, the evidence, the question and the reasoning stay attached to the entry — and a qualified accountant (ACCA) is accountable for the work.
It sits inside bookkeeping and month-end close, and the same discipline covers the bank side of the ledger — the standard for a transaction that cannot be matched is set out in what should happen when a bank transaction cannot be matched. The full chain a document travels, from arriving to being visible, is described in what should happen after you send a document. Who can see a document once it has been sent, and how long it is kept, is covered under security.
The realistic limit is the one the example shows: some facts exist only inside the business, and no provider can supply them. What can be removed is everything up to that point — the retrieval, the reconstruction, and the decision about what is actually being asked. Try it on something genuinely awkward of your own: send one document and see what comes back.
Asked by owners who have been sent one of these questions.
What should happen when a supplier invoice deducts a deposit without saying which one? +
The records should be searched before anybody is asked anything. A deposit deduction has to correspond to a payment made earlier, and finding that payment usually settles most of the question. What the records cannot settle is whether the deposit relates to the same piece of work, particularly where the supplier numbers phases or jobs differently. That remaining gap should be raised as one specific question, with the invoice held rather than posted on the assumption that the deduction is self-explanatory.
Does holding an invoice mean it is missing from the accounts? +
It should not. A held invoice is logged as received, with its date, reference, supplier and amount, so the obligation is visible and the payables position is not understated. What is deliberately left open is the classification — which account, which project, which period. The distinction matters: a business should always be able to see what it owes, even while somebody is still working out what the cost actually was.
Is a photograph of a supplier invoice acceptable as a record? +
Usually yes, provided it is complete and legible, and provided it is retained rather than treated as a message. What matters is that every figure, reference, date and party is readable, and that the image is stored against the entry it supports so it can be produced later. Where a photograph cuts off a line, a total or the payment terms, it is worth asking the supplier for the original rather than recording from a partial document.
What if a supplier invoice is addressed to the wrong company name? +
It should be queried rather than ignored or quietly accepted. A wrong addressee is sometimes carelessness and sometimes a sign the invoice belongs to a different entity — a related company, a former trading name, or another customer of the same supplier. Paying an invoice made out to somebody else can complicate recovery if it later turns out to have been wrongly issued. A corrected invoice takes a supplier a few minutes and removes the ambiguity permanently.
A supplier invoice has arrived months after the work was done. Which period does it belong to? +
The cost relates to the period in which the work happened, but whether the books are reopened to reflect that depends on whether the period has been closed and reported, and on how significant the amount is. A common, defensible approach is to record it in the current period with a note stating the period it relates to and why it arrived late, so the timing is visible in the reporting instead of being smoothed away. Where the amount is large enough to change a reported figure, it warrants a conversation rather than a convention.
Is a deposit paid to a supplier a cost or something else? +
It depends on what has happened. Money paid before the work is done is a prepayment — an asset, because the business is owed goods or services. It becomes a cost as the work is delivered, usually when the final invoice arrives and the deposit is set against it. Treating a deposit as an immediate cost overstates expenses in one period and understates them in another, and leaves nothing on the record to show the supplier is holding money.
Should an invoice being queried still be paid on time? +
Frequently yes, and the two questions should be kept apart. If the amount payable is clear and the query is about how the cost should be classified, there is no reason to pay a supplier late. If the query is about whether the amount is right at all — a duplicate, a rate that was not agreed, work that was not done — then payment should wait until it is settled. Any payment is prepared for the business to authorise and release; nothing goes out on an outsourced provider’s own initiative.
Who in a small business should answer a bookkeeper’s questions? +
Whoever holds the fact, which is often not the owner. The person who commissioned a supplier, agreed a scope or attended a site can usually answer in one line what the founder would have to reconstruct. Naming that person per supplier or per project — and telling the provider who it is — removes a large amount of routing delay. Questions that pile up almost always do so because they were sent to somebody who had to forward them.
Send us the invoice nobody wants to deal with. We’ll come back with the entry — or the question.
The one with the handwriting on it, the one that deducts something unexplained, the one that arrived four months late. We will tell you what we established, what we could not, and exactly what we would need from you.
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Reviewed by an ACCA on the At Par team · Last updated 29 July 2026 · Illustrative worked example. Not a customer case study. The studio, the supplier and the figures are invented. See what we actually do.