Derek had been in medical device sales for six years when a competitor poached him. Better territory, better product, and a commission structure that looked, on paper, dramatically more generous than his old one.
His old job: flat 6% on everything he sold. Simple. Predictable. He knew exactly what each deal was worth before he closed it.
The new offer: tiered commission. 4% on the first $50,000 in monthly sales. 7% on sales from $50,001 to $100,000. 10% on anything above $100,000. The hiring manager walked him through it with a lot of enthusiasm. "Once you're firing on all cylinders, you're making 10 cents on every dollar."
Derek had been averaging about $85,000 a month in sales at his old job. He did the rough math in his head: $85,000 at 6% was $5,100. At the new structure, the first $50k would earn $2,000 and the next $35k would earn $2,450. Total: $4,450. He was so focused on the 10% ceiling that he missed the fact that his actual range ($85k a month) sat squarely in the 7% tier, not the 10% one.
He took the job anyway. It took three months of smaller paychecks for the realization to land.
The Hidden Psychology of Tiers
The problem with tiered commission isn't that it's dishonest. It's that it's designed to highlight the best-case scenario, the rate you earn at peak performance, while obscuring what you'll actually earn at your realistic, day-to-day output. A flat rate is transparent. A tiered structure requires you to know, in advance, exactly where your sales will land each month. Most people don't know that. Most people guess high.
There's also a psychological trap built into tiered structures: the tiers create artificial urgency. If you're at $92,000 in sales with four days left in the month, you'll push hard to hit $100,000 and unlock that 10% rate, not because the math necessarily justifies the effort, but because the tier is right there. Companies know this. The tiers aren't random. They're placed to motivate behavior that benefits the company, not just you.
When Tiered Commission Works in Your Favor
That said, tiered commission isn't inherently bad. If your realistic monthly sales volume consistently clears the top tier, tiered pays more than flat, sometimes significantly more. The structure rewards high performers disproportionately, which is exactly what high performers want. Derek's mistake wasn't taking a tiered job. It was not running the numbers at his actual expected volume, not the ceiling volume.
Run the Numbers Before You Sign
Use our Commission Calculator before you accept any commission-based offer. Run the Flat Rate tab at your old or expected rate, then run the Tiered tab with the exact thresholds from your offer letter. Compare them at three scenarios: a slow month, a typical month, and a strong month. The gap between those three scenarios tells you how much income volatility you're signing up for, and whether the upside is worth it. For broader advice on evaluating job offers, see our guide on how to negotiate salary.
Derek's Update
Derek eventually figured out that he needed to average $115,000 a month in sales for the tiered structure to outperform his old flat 6%. He hit that twice in his first year. He missed it nine times. His average annual commission at the new job was about $4,200 less than what he'd been making.
He's still there. The territory is genuinely better, and the product sells itself in a way his old one never did. He thinks he'll clear $115k consistently once he's fully embedded in the market. He might be right.
But he wishes he'd run the numbers before he signed.