One-off order: check incremental cash before accepting

A one-off order needs a capacity check before an incremental cash calculation. After this guide, you can save a reviewable decision card showing the cash difference, conditional buyer-price floor, and unanswered commercial questions.

Last updated: 29 October 2026.

What does a one-off order screen actually decide?

A buyer offers a fixed quantity at a stated price. Your first question is narrow: compared with declining that offer, which cash amounts would change? This worksheet gives you a documented numerical screen and a conditional buyer-price threshold. It does not produce a company profit forecast, approve customer credit, or authorize a sale.

Keep the buyer's quantity fixed. A request for one hundred units is not permission to assume a larger batch, different delivery terms, or a recurring contract. Record the offer reference and the period when the work must happen. If any of those terms change, open a new scenario rather than silently modifying the original.

The finished card separates capacity evidence, the incremental cash difference, and unresolved commercial questions. “Positive” belongs to the second field only. When several optional products compete for the same hours, use a whole-unit product mix comparison instead. That is a different decision from accepting one indivisible extra order.

Prove spare capacity before calculating a benefit

Spare capacity means usable room within the relevant period after protecting existing commitments. An empty afternoon on one machine does not prove that packing, skilled labour, materials, and delivery capacity are available. Write down the limiting resource and who confirmed the remaining capacity.

1. List protected work with its due dates. Expected output: existing promises are visible before the new offer is considered.
2. Ask the responsible operator to confirm the additional units that fit without displacing other work. Output: a dated capacity statement, not a hopeful estimate.
3. Compare the fixed offer quantity with that statement. Output: either a documented fit or a stop requiring a different analysis.

The fictional exercise below explicitly assumes no displaced sales or competing use. In a real decision, an unknown alternative is not evidence that its value is zero. Stop if overtime, another shift, or sacrificing regular work becomes necessary. Do not expand this simple card into an improvised optimization model.

Availability of stock is a separate prerequisite. The scarce-stock commitment check addresses protected quantities, not whether an extra sale improves the cash comparison. Passing one test does not imply passing the other.

Build the changing-cash bridge

Incremental means additional because of this decision. ACCA's relevant-cost guidance focuses on cash flows that change with a choice. An unchanged allocation of existing overhead is not a cash saving. Equally, a fixed amount payable only because of this particular order still belongs in the comparison.

Create two columns labelled decline and accept. For each payment, add a short explanation of why its amount changes. Materials bought for the order, extra packaging, and order-only delivery can belong in the bridge when supported by evidence. The label “labour” alone tells you nothing about whether a payment changes.

Do not enter an unsupported zero for uncertain wages, commissions, taxes, or rework. Obtain the applicable basis before treating the card as a real screen. Our teaching numbers deliberately stipulate a complete incremental payment amount; they do not establish the tax treatment or cost behaviour of your business.

Keep sourcing decisions elsewhere. A make-or-buy comparison asks which source should meet a requirement. This screen assumes no sourcing switch and compares one additional buyer order with no additional order. Similar arithmetic does not make those decisions interchangeable.

A fictional exercise with a saved, checked result

Exercise label: these are author-created teaching inputs, not an Anar project, client case, supplier quotation, or measured business outcome. The arithmetic was executed, independently reconstructed in integer minor units, saved, and read back. No native spreadsheet interface was tested. Use the figures to inspect the method, not to benchmark a real price.

Receipts are 100 × 9 = 900. Additional payments are 100 × 6 + 200 = 800. The difference is 100. Call it an incremental nominal cash difference, not net profit or an available bank balance. Payment dates, financing costs, and collection uncertainty are outside this numerical exercise.

Check the bridge with an unchanged common payment of 300 in both paths. The decline path contains −300. The accept path contains 900 − 600 − 200 − 300 = −200. Subtract the paths: −200 − (−300) = 100. These are totals of the displayed rows only, not complete business cash forecasts.

The independent reconstruction sums one hundred receipts of 900 minor units and one hundred payments of 600 minor units, then adds 20,000 for setup and delivery. The resulting difference is 10,000 minor units, matching 100 major units. Saving and reopening the result confirmed the stored inputs and outputs matched.

Find the conditional buyer-price floor

Divide additional payments by the fixed order quantity. In the exercise, 800 / 100 = 8 per unit. At that buyer receipt, the incremental difference is zero. This threshold is not a recommended selling price, a regular price list, or a guarantee that the commercial deal is worthwhile.

Now change only the order-only charge from 200 to 350. At the original receipt of 9, the difference becomes 900 − 600 − 350 = −50. The zero-difference threshold becomes 9.50. An unchanged unit payment does not protect the result when a one-time charge changes.

A separately agreed quantity of 120 gives 1080 − 720 − 200 = 160 under the same stipulated terms. That is a different scenario requiring fresh confirmation, not an automatic extension of the buyer's offer. A quantity of 121 exceeds the stated 120-unit capacity, so this card stops before issuing an economic result.

Save a reviewable card in a short working session

A fifteen-minute session is a suggested working window, not a measured completion promise. Your useful output may be a finished screen or a clearly named missing input. Do not rush an unsupported number into the sheet merely to finish within the window.

On Windows, search Start for Notepad and create a blank document. Copy the template into it. Open Calculator from Start separately to check the arithmetic; Notepad does not execute formulas.

1. Capture the offer, quantity, period, and version. Output: an unambiguous description of the decision being screened.
2. Attach capacity confirmation and the basis for each changing payment. Output: evidence references beside the inputs.
3. Calculate receipts, payments, difference, and the zero-difference threshold. Output: four numbers that someone else can reconstruct.
4. Save, close, and reopen the card. Output: matching inputs and totals in the retained version, with open questions still visible.

Offer reference and date: ...
Fixed quantity and required period: ...
Spare-capacity evidence and owner: ...
Unit incremental receipt and basis: ...
Unit incremental payment and basis: ...
Order-only additional payment: ...
Receipts = quantity × unit receipt
Payments = quantity × unit payment + order-only charge
Difference = receipts − payments
Zero-difference threshold = payments / quantity
Open issue / owner / next check: ...
Numerical status: POSITIVE / ZERO / NEGATIVE / HOLD

In Notepad, choose File → Save As, select Documents and save one-off-order-V1.txt. Keep the offer date in the card. If that name exists, choose a new version name instead of overwriting another file. Close Notepad, open Documents in File Explorer and reopen the saved file. For the teaching card, check quantity100, receipts900, payments800, difference100 and threshold8 against the original calculation. Retain the inputs and open questions, not only a screenshot of the final number. Record the reason for each new version and recalculate both the bridge and threshold when an input changes.

Keep the numerical status separate from permission to trade

OpenStax's special-order discussion identifies capacity, differential costs, and qualitative considerations as relevant to the decision. A positive arithmetic difference does not establish acceptable quality, a workable delivery promise, or a harmless effect on existing customer relationships. Assign those questions to named people rather than burying them in the total.

• Missing, nonfinite, negative, or inconsistent inputs mean HOLD. Zero quantity cannot support a per-unit threshold.
• Unknown capacity means HOLD even when the cash bridge looks attractive.
• Different tax or payment bases require reconciliation before comparison.
• Late buyer payment requires a separate check that earlier supplier and wage payments can be funded.

For broader performance, use a profit margin calculation rather than relabelling this incremental difference. If the buyer already owes money, an accounts receivable aging review can organize due balances; it cannot guarantee future collection.

A useful final note reads: “Numerical screen positive under the attached assumptions; capacity confirmed by this record; payment and delivery questions remain with these owners.” That preserves the value of the calculation without pretending it has answered every business question. Retain a HOLD card too: its named evidence gap is a concrete next action.