---
title: "Missing cost: definition, formula and example"
description: "A cost that was never entered, so the calculation reads it as zero. The order then looks more profitable than it is, by exactly that cost."
url: https://offersuite.io/glossary/missing-cost
updated: 2026-10-13
---

# Missing cost

A cost that was never entered, so the calculation reads it as zero. The order then looks more profitable than it is, by exactly that cost.

## In plain words

A missing cost is a cost that exists and was never entered. The gift has no unit cost on file. The new product has no label cost yet. Nothing looks wrong, because a calculation with a blank in it still returns a number.

That number is too high by the whole of the missing cost. It is the most common reason a margin report flatters an offer, and gifts are the usual culprit, since nobody sells them and so nobody prices them.

## Formula

- Reported margin = true margin + every cost that is missing

## Worked example

Three bags with a free mug keep $43.86 when the mug's $4.00 unit cost is entered. Leave the mug uncosted and the engine, given nothing to charge, puts the same order at $47.86.

The margin rate reads 46.9% when it is really 43.0%. Every order with the gift carries the same error.

### The example order

A $40.00 bag of coffee, shipped free, every cost counted

Revenue $40.00 to contribution margin $15.36 (38.4%)

Revenue

$40.00

Cost of goods

−$12.00

Pick and pack

−$1.18

Packaging

−$0.50

Shipping label

−$7.50

Card fee per order

−$0.30

Refunds

−$2.00

Card processing

−$1.16

Contribution margin

$15.36

2 declared kinds cost nothing on this option

Computed by the margin engine in Offer Suite's own code, in whole cents, from a $40.00 bag of coffee with a $12.00 unit cost.

## A missing cost is not a cost of zero

Some costs really are zero: a digital insert, shipping the customer collects. A missing cost is unknown. A system that cannot tell the two apart will show a confident margin for an order it cannot actually cost.

## Using it

Before trusting a margin, ask which costs it is built on and whether any are blank. Check gifts, samples, new products and anything added to an offer at the last minute. Enter a rough cost now and correct it later. A dated estimate beats a blank that reads as free.

## In Offer Suite

Offer Suite's forecasts name the costs an option is missing, so a blank is never passed off as a result, and its item health report lists the items whose costs are incomplete.

Source: Offer Suite's cost ledger.

## Related

- [Glossary **Glossary of offer economics** The terms behind offer profit, defined plainly with their formulas and a worked number: contribution margin, profit per visitor, break-even lift and more.](https://offersuite.io/glossary)
- [Calculator **Gift with purchase profit calculator** What a free gift costs per order, after its unit cost, its extra pick and its handling, and how much conversion it has to add to pay for itself.](https://offersuite.io/calculators/gift-with-purchase-profit)
- [Glossary **Cost of goods sold (COGS): definition and formula** What the units you sold cost you to make or buy. In an offer calculation it is charged per unit, gifts included, at the cost in effect on the order's date.](https://offersuite.io/glossary/cost-of-goods-sold)
- [Glossary **Gift with purchase: definition, formula and example** A free item added to an order to win the sale. It leaves the price alone and adds a unit cost, a pick and sometimes a heavier parcel.](https://offersuite.io/glossary/gift-with-purchase)
- [Glossary **Cost ledger: definition, formula and example** A record of every cost with the date it applies from, added to and never overwritten, so each order is costed at what was true on its date.](https://offersuite.io/glossary/cost-ledger)
- [Glossary **Forecast profit: definition, formula and example** The profit an offer should make per order or per visitor, worked out from its prices and costs before any order exists.](https://offersuite.io/glossary/forecast-profit)