You close a deal on a Tuesday and a bigger one on a Friday, and somehow the second one pays out at a noticeably higher rate per dollar. That's not a mistake on your statement. It's a tiered commission plan doing exactly what it was built to do, and if nobody walked you through the mechanics, the math looks like it's lying to you.
It isn't. It's just layered, and most reps never see the layers spelled out in plain numbers.
The three structures hiding behind "commission"
"Commission" gets used as one word for three genuinely different payout models, and mixing them up is where most confusion starts.
Flat rate pays the same percentage on every dollar of qualifying revenue. Sell $10,000 at 8%, you earn $800. Sell $50,000 at 8%, you earn $4,000. Simple, predictable, and easy to model in your head.
Tiered rate raises the percentage once you cross defined revenue thresholds, but usually only on the dollars inside that tier, not retroactively on everything you sold. A plan might pay 5% on the first $20,000, 7% on the next $20,000, and 10% above $40,000. Cross into tier three and your rate doesn't jump on the whole deal, it jumps on the marginal dollars sitting in that bracket.
Accelerator is a multiplier that kicks in once you clear a quota, usually monthly or quarterly. Instead of a new percentage bracket, your existing rate gets multiplied, so a 6% base rate might become 9% (a 1.5x accelerator) on every dollar past 100% of quota, sometimes applied retroactively to the whole period once you cross the line.
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Walking through a tiered calculation
Say your plan pays 5% up to $20,000 in monthly sales, 7% from $20,001 to $40,000, and 10% above that. You close $52,000 this month.
- Tier one: $20,000 x 5% = $1,000
- Tier two: $20,000 x 7% = $1,400
- Tier three: $12,000 x 10% = $1,200
Total commission: $3,600. Notice the tier-three math only applies to the $12,000 that actually sits above the $40,000 line, not the full $52,000. That marginal-bracket logic is the single most common thing reps get wrong when they try to eyeball their own check, and it's the same shape as how income tax brackets work, which is probably why it feels familiar even when the numbers surprise you.
Where accelerators change the shape of the math
Accelerators stack on top of the tier structure rather than replacing it. If your quota is $40,000 and your plan includes a 1.5x accelerator on everything past quota, the same $52,000 month changes the tier-three calculation:
- Tier three, accelerated: $12,000 x 10% x 1.5 = $1,800
New total: $1,000 + $1,400 + $1,800 = $4,200, a $600 swing from the accelerator alone. This is why two reps who technically hit "110% of quota" can take home very different checks: the accelerator threshold, the multiplier size, and whether it applies retroactively to the whole period or only to the overage all move the number independently of each other.
Draws and clawbacks: the part that shows up later
A draw is an advance against future commission, usually used to smooth out income during a slow ramp period. You get paid a guaranteed amount each pay period, and it gets reconciled against actual commission earned once deals close. A "recoverable draw" means any shortfall carries forward as debt against future commission. A "non-recoverable draw" means the company eats the difference if you don't earn enough to cover it, which is a materially better deal for you as the rep.
Clawbacks work in the opposite direction. If a customer cancels or refunds within a defined window, some plans pull the commission back out of a future paycheck. Before signing anything, it's worth knowing whether your plan has a clawback window, how long it runs, and whether it applies to renewals as well as new deals.
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How the structure changes by industry
Tiered and accelerator plans aren't universal. The shape of "commission" shifts a lot depending on what's actually being sold.
Real estate agents typically work on a flat percentage of the sale price, split between the listing side and the buying side, and then split again with their brokerage under whatever arrangement they've negotiated. Tiers are less common here than a straight percentage, though some brokerages offer a rising split as an agent's annual production increases.
Insurance sales often front-load commission heavily in the first year of a policy, with a much smaller "trail" or renewal commission paid in subsequent years as long as the policy stays active. This is why insurance compensation can look lopsided compared to a SaaS sales role: most of the payout happens once, up front, rather than recurring evenly.
SaaS and software sales usually combine a base salary with tiered, quota-based commission on new bookings, frequently layered with accelerators past 100% of quota and sometimes a separate, smaller commission rate on renewals or upsells. This is the structure most similar to the walkthrough above, and it's also the one where reps most often get surprised by a marginal-bracket miscalculation.
Retail and hourly sales roles more often use flat, small percentages or fixed spiffs tied to specific products, layered on top of an hourly wage rather than replacing it entirely. The stakes per transaction are lower, so the plans tend to be simpler by design.
Knowing which category a new offer falls into before you negotiate is useful context: a real estate agent comparing brokerages should ask about the split schedule, while a SaaS rep should be asking about quota attainment history and accelerator thresholds specifically.
Reading a commission plan before you sign it
A few questions worth asking a hiring manager or sales leader before you accept a role with a commission component:
- Are tier thresholds based on gross revenue, net revenue after discounts, or margin? These produce very different numbers on the same sale.
- Do accelerators apply retroactively to the whole period once you cross quota, or only to dollars earned after that point?
- Is the draw recoverable or non-recoverable, and over what time window does it reconcile?
- What triggers a clawback, and does it cover renewals in addition to first-time sales?
- Are thresholds reset monthly, quarterly, or annually, and does a slow month get averaged against a strong one?
None of these are trick questions. A well-run comp plan should have clear, written answers to all five, and a hiring manager who can't answer them is telling you something about how the plan actually gets administered.
Running your own numbers instead of trusting the statement
The honest answer to "why doesn't my paycheck match what I expected" is usually one of the mechanics above interacting in a way that isn't obvious from a single line item on a pay stub. Tiered brackets, accelerator multipliers, and draw reconciliation all compound, and doing that math by hand across a full quarter gets error-prone fast.
That's the actual use case for a dedicated commission calculator: plug in your tier structure, your accelerator terms, and your draw balance, and see the breakdown the same way your employer's payroll system does, instead of reverse-engineering it from a single deposit. It's built specifically for flat, tiered, and accelerator structures with tier-by-tier breakdowns, so you can check a real offer or a real paycheck the same afternoon you get it, rather than waiting until the next statement to find out if the math holds up.
If you're evaluating a new offer, it's worth modeling your last two or three actual sales months against the new plan's structure rather than the old one, since tier thresholds and accelerator points rarely translate cleanly between employers. A plan that looks generous on a one-page summary can pay out worse than your current one once you run last quarter's real numbers through it.
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What to do when the numbers on your statement don't match your own math
If you run your own calculation and it doesn't match what payroll actually paid you, the most common causes are a misapplied tier boundary, an accelerator that got calculated on the wrong base, or a draw reconciliation that pulled more than expected out of the current period. Before assuming it's an error, ask payroll or your manager for the specific line-item breakdown, tier by tier, the same way the walkthrough above lays it out. Most discrepancies turn out to be a documented rule you weren't told about, like a clawback window or a cap on accelerator payouts, rather than an actual mistake. Getting the breakdown in writing also protects you if there genuinely was an error, since "the total looked wrong" is a much weaker case than "tier three was calculated on the wrong revenue base."
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The takeaway
Commission math isn't actually complicated once the structure is visible. It's confusing because most plans only show up as a single number on a check, with the tiers, accelerators, and draw reconciliation happening invisibly behind it. Ask for the written plan, run your own numbers against it before you sign, and check your statement against the same math every pay period rather than trusting that it's right by default.
For more context on how sales compensation plans get structured across industries, SHRM's compensation resources and the Bureau of Labor Statistics both publish general data on how commission-based pay compares to salaried roles. The Wikipedia entry on commission-based pay is also a reasonable starting point if the terminology in a new offer letter is unfamiliar, and the IRS treats commission as supplemental wages for withholding purposes, which is worth knowing before you budget against a projected number. Investopedia is another reasonable general reference if you want a plain-language glossary for terms like OTE (on-target earnings) that show up in offer letters.
You can browse EvvyTools' full tools directory for calculators covering other freelance and business math, or check the blog for more breakdowns like this one. EvvyTools builds these as free, no-signup tools specifically so you can check real numbers before committing to anything.
