Work out how much extra volume the discount needs to break even, using your margin rather than your price. On thin margins the required increase is frequently larger than any promotion achieves.

The number nobody calculates

A discount is decided by what feels attractive: ten percent, twenty percent, a round figure that looks generous.

What is almost never calculated is how much additional volume that discount needs to generate before it makes more money than doing nothing.

That number is knowable in five minutes, and it is frequently large enough to change the decision.

The reason it surprises people is that a discount comes entirely out of margin, not out of price.

Where the discount actually comes from

The point that makes the arithmetic obvious once seen.

An item selling for a hundred with a forty percent margin makes forty.

A twenty percent discount reduces the price to eighty, and the cost has not changed, so the margin falls to twenty.

The discount was twenty percent of the price and fifty percent of the profit.

On a twenty-five percent margin, the same discount removes eighty percent of the profit, and at a twenty percent margin it removes all of it.

Which is why a discount that sounds modest can be the difference between a profitable month and a busy one.

The break-even volume

Those figures are the same for everybody, since they follow from the arithmetic rather than from any particular business. The last line is worth sitting with.

Doubling sales is not a normal outcome

The reality check that the table forces.

A promotion that needs a hundred percent volume increase to break even is not going to break even, because promotions of that size are rare and are usually driven by more than a discount.

Which means many discounts are a decision to make less money in exchange for being busier, and that can be a legitimate choice.

Clearing stock before a season ends, buying a first order from customers who will return, or filling capacity that would otherwise be idle are all reasonable reasons to run a promotion that loses margin.

The problem is doing it without knowing, and then concluding from a busy month that it worked.

A worked example

A retailer ran twenty percent off for a week and reported it as a success: orders were up by around forty percent and it was their busiest week of the year.

Their average margin was thirty-five percent.

At that margin a twenty percent discount needs roughly a hundred and thirty percent volume increase to break even.

Forty percent more orders at a much thinner margin produced meaningfully less profit than the previous week, alongside more packing, more enquiries, and more returns.

They had worked considerably harder for less money and had recorded it as their best week.

The following year they offered free shipping over a threshold instead, which cost a fraction of the margin and produced a similar increase in orders.

Cheaper things to offer

Several alternatives cost less margin and are frequently more effective.

Free shipping above a threshold, which raises average order value and costs you only the shipping on qualifying orders.

A gift with purchase, costed at your cost rather than its retail value.

A bundle at a modest discount, which increases the order size rather than reducing the margin on a single item.

Extended returns, better service, faster dispatch, or a longer guarantee, all of which are reasons to buy that cost almost nothing.

And a threshold offer rather than a blanket one, so the discount is earned by a larger basket rather than given to somebody who was buying anyway.

The people who were buying anyway

The hidden cost that makes the arithmetic worse than the table suggests.

A site-wide discount is given to every customer, including the ones who had already decided to buy at full price.

So the margin lost is not only on incremental orders, it is on the entire base, and the incremental orders have to cover both.

Which is why targeted offers frequently outperform blanket ones: a code for lapsed customers, or a threshold that requires a bigger basket, concentrates the discount where it changes behaviour.

A blanket promotion in your busiest week is the most expensive version of this, since that is when the most people were going to buy anyway.

What discounting teaches customers

The longer-term cost, which does not appear in any single month's figures.

Regular promotions train people to wait, so full-price weeks weaken and the discount becomes the effective price.

That is a slow effect and a real one, particularly for a business with a returning customer base.

A small business that discounts every December is not running a promotion, it is running a December price, and would be better setting that price openly.

If you discount, vary what you offer and when, so nobody learns the pattern.

The counter-case

Margin arithmetic is not the only consideration and treating it as decisive can be wrong.

Clearing seasonal stock at a loss is better than holding it for a year, and the alternative to a thin margin is frequently no sale at all.

Acquiring a customer at a loss on a first order is a legitimate investment where they return, provided you know what a returning customer is worth.

And a business with idle capacity, where the marginal cost of one more job is small, has quite different arithmetic from a retailer buying stock.

Run the numbers, decide deliberately, and be honest afterwards about whether a busy month was a profitable one.

Before you discount

  1. Find your actual margin, not your markup.
  2. Calculate the break-even volume increase.
  3. Ask whether that increase is plausible.
  4. Consider free shipping or a threshold instead.
  5. Target it rather than applying it site-wide.
  6. Decide what you are buying if it will lose money.
  7. Compare profit afterwards, not order count.

Step seven is the one that stops a loss-making promotion being repeated every year on the strength of feeling busy.

What repeated codes teach customers is covered in discount codes and what they teach customers.

Frequently asked questions

Why does a discount cost more than it looks?

Because it comes entirely out of margin. On an item with a forty percent margin, a twenty percent discount removes half the profit; at a twenty percent margin it removes all of it.

How much extra volume does a discount need?

At a fifty percent margin, ten percent off needs about a quarter more volume. At a thirty percent margin, twenty percent off needs about three times the volume.

Is a busy promotional week a successful one?

Not necessarily. Forty percent more orders at a much thinner margin can produce less profit than the previous week, with more packing, enquiries, and returns.

What costs less than a discount?

Free shipping above a threshold, a gift costed at your cost, a bundle, extended returns, or faster dispatch. All are reasons to buy that cost little margin.

Why are targeted offers better?

A site-wide discount is given to everybody, including people who had already decided to buy. Targeting concentrates it where it actually changes behaviour.

Is discounting ever right?

Yes: clearing seasonal stock, acquiring customers who return, or filling idle capacity where the marginal cost is small. The problem is doing it without knowing the arithmetic.

West Coast Media Solutions Inc. provides web design, web development, hosting, digital marketing, and business consulting to organisations across Canada, drawing on more than twenty-five years in the field.

Planning twenty percent off?

Work out the volume increase needed to break even at your margin first. It is usually larger than any promotion achieves.

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