Commission Calculator

Commission Is a Percentage of Something Specific

The rate is the easy part. What the rate applies to is where commission plans differ, and where disputes come from:

Basis	What it means	Effect on the rep
Gross revenue	The invoice total	Simplest; rewards discounting
Net revenue	After refunds and credits	Rep carries churn risk
Gross profit	Revenue minus cost of goods	Aligns rep with margin
Collected cash	Only what the customer actually paid	Rep carries collection risk

A 10% commission on gross revenue and a 10% commission on gross profit are completely different plans. On a product with a 40% margin, the second pays 60% less.

Tiered and Accelerated Rates

Most plans step up once quota is met, which changes the marginal rate rather than the whole rate:

Attainment	Rate	On $50,000 of sales
0–80% of quota	5%	Base rate
80–100%	8%	Applies to that band only
Above 100%	12%	Accelerator

The important word is *band*. In a properly written plan the accelerator applies only to the portion above the threshold, not retroactively to everything — plans that do apply retroactively create a cliff where one extra deal is worth an enormous amount, and reps will manage their pipeline around it.

Clawbacks

If a customer churns or refunds inside a defined window, commission already paid is usually recovered. Two things matter: the window length, and whether recovery comes from future commission or is owed back directly. A twelve-month clawback on an annual contract means a rep is never fully paid for a deal until a year after closing.

The Draw

A guaranteed draw against commission is an advance, not a salary. A *recoverable* draw is repaid from future commission, so a rep below quota accumulates debt; a *non-recoverable* draw is a floor. The difference is enormous for anyone in a long ramp period, and it is the first thing to check in an offer.

Calculating Backwards

To earn a target commission, divide rather than multiply: at a 7% rate, earning $5,000 requires $71,429 of sales, not $70,000. It is the same gross-up arithmetic that platform fees need, in the other direction.

The Four Percentage Questions

Almost every percentage problem is one of these, and mixing them up is the most common arithmetic error there is:

Question	Formula	Example
What is X% of Y?	Y × (X ÷ 100)	15% of 80 = 12
X is what % of Y?	(X ÷ Y) × 100	12 is 15% of 80
X is Y% of what?	X ÷ (Y ÷ 100)	12 is 15% of 80
% change from X to Y	((Y − X) ÷ X) × 100	80 → 92 is +15%

Percentage Points Are Not Percent

A rate moving from 4% to 5% is one percentage point, and a 25% increase. Both statements are true and they are not interchangeable — headlines routinely use the smaller one when reporting a rise and the larger one when reporting a fall.

Increases and Decreases Do Not Cancel

Start	Change	Result
100	+50%, then −50%	75
100	−50%, then +50%	75
100	−20%, then +25%	100

The reason is that the second percentage applies to a different base. To reverse a −20% you need +25%, not +20%. This is why a stock that falls 50% must double to break even, and why "we cut costs 30% then grew 30%" leaves you 9% down.

Reversing a Percentage

To find the price before a 20% discount, divide by 0.8 — do not add 20%:

`` before = after ÷ (1 − discount) $80 ÷ 0.8 = $100 ✓ $80 × 1.2 = $96 ✗ ``

The same asymmetry applies to tax, tips, markups and platform fees.