Margin vs markup, settled.
These two get confused constantly, and the confusion costs real money.
Margin is profit as a percentage of selling price. Markup is profit as a percentage of cost. The same transaction can be described either way and the percentages will always differ — markup is always larger because the denominator (cost) is smaller than the price.
The translation that helps most: a 50% margin equals a 100% markup. A 33% margin equals a 50% markup. A 25% margin equals a 33% markup. If your supplier quotes markup and you quote margin (or vice versa), you'll talk past each other every time.
Operationally: use markup when you're setting a price from a cost, because the formula is cleaner. Use margin when you're reporting profitability, because it's what investors and bookkeepers expect to see.
The three margins and what each one hides.
Gross margin can flatter you. Net margin can scare you. Operating margin sits in between and is the most useful number for actually running the business.
Gross margin only looks at the unit economics. It tells you whether the product can carry overhead — but it ignores rent, salaries, marketing, and everything else. A 90% gross margin SaaS company can still bleed cash if the OpEx is heavy.
Operating margin includes the cost of running the business but excludes taxes and financing. This is the cleanest measure of operational performance — it's what acquirers focus on, and it's what tells you whether your business model works at the current scale.
Net margin is what reaches the owners. It's what investors care about, but it can be distorted by one-time tax events, non-recurring charges, or financing decisions that don't reflect the underlying business.
The three together form a ladder. If gross is healthy but operating is weak, your overhead is too high. If operating is healthy but net is weak, taxes or debt are eating you. Read them as a sequence.
What a "good" margin actually means.
The honest answer: "good" is industry-relative, and the headline number matters less than the trend.
Software companies routinely sustain 70–90% gross margins because copies of code are nearly free to produce. That's not because they're better businesses than restaurants — it's because the cost structure is different. A 5% net margin in retail might be exceptional; a 5% net margin in SaaS would be a disaster.
What actually matters: is your margin above or below your industry's median, and is it trending up or down. A business with 8% net margin growing 2 points a year is in better shape than one with 15% net margin shrinking by 1 point.
If you must benchmark in absolute terms: 5–10% net margin is the broad middle for most businesses, 10–20% is good, 20%+ is excellent for anything outside software.
How discounts destroy margin faster than you think.
Discounts feel like a small concession on price. They are a large concession on profit.
Take a product with a 40% gross margin — say, $60 cost and $100 price. Offer a 20% discount and the new price is $80. The cost is still $60. The new gross margin is 25%. You haven't lost 20% of your profit; you've lost almost 40% of it.
This is why retailers spend so much energy framing discounts as "limited time" or "members only" — they need volume increases big enough to offset the margin damage, and that's rarely the case.
Before any discount, run the post-discount margin through the calculator. If the discounted margin is below your floor, the only way the math works is if the volume increase is dramatic — which most discounts don't actually produce.
Common profit margin mistakes.
- Conflating margin with markup and ending up with a price 10% lower than you intended.
- Reporting gross margin as if it were net, then being surprised when there's no cash at year-end.
- Ignoring owner compensation in operating expenses and overstating profitability.
- Pricing off cost (cost-plus) instead of off customer value, then being unable to defend the price.
- Treating discounts as marketing expenses instead of margin destroyers.
- Benchmarking against the wrong industry — comparing a services business to a SaaS company is meaningless.