Commission math, in short
Commission plans come in a few common shapes. Simple: sales × rate. Tiered: different rates on different slices of sales, like tax brackets — $35,000 across 5%/7%/10%/12% brackets pays $2,550, not $4,200. Base plus commission: fixed pay plus a percentage, sometimes with a bonus for beating quota. Reverse: divide a commission goal by the rate to find the sales needed to hit it.
Key takeaways
- Simple: $10,000 in sales at a 10% rate pays $1,000 commission.
- Tiered: $35,000 in sales across brackets of 5%/7%/10%/12% pays $2,550 total — a 7.29% effective rate, well below the 10% top bracket actually reached.
- Base + commission: $3,000 base, $25,000 in sales at 8% ($2,000 commission), plus a 5% bonus on the $5,000 over a $20,000 quota ($250), totals $5,250.
- Reverse: to earn $5,000 at a flat 10% rate, you need $50,000 in qualifying sales.
Simple commission: the base case
Every other structure on this page is a variation on one formula: commission = sales × rate. $10,000 in sales at a 10% rate pays exactly $1,000 — no brackets, no base pay, no quota to clear first. It's the easiest structure to reason about, which is exactly why more complex plans get compared back to it.
How tiered commission actually adds up
Tiered plans work like tax brackets: each slice of sales gets its own rate, not the top rate applied to everything. On $35,000 in sales across the default brackets:
$0 - $10,000 at 5% = $500
$10,000 - $25,000 at 7% = $1,050
$25,000 - $35,000 (of the $25k-$50k bracket) at 10% = $1,000
Total commission = $2,550 → effective rate 7.29%
It's tempting to see "reached the 10% bracket" and assume a 10% payout — the effective rate of 7.29% shows why that's wrong. Only the portion of sales actually inside each bracket gets that bracket's rate.
Base salary + commission + quota bonus
Using the defaults — $3,000 base, $25,000 in sales, 8% commission rate, $20,000 quota:
Commission = $25,000 × 8% = $2,000
Quota achievement = $25,000 ÷ $20,000 = 125%
Bonus = ($25,000 − $20,000) × 5% = $250
Total earnings = $3,000 + $2,000 + $250 = $5,250
The bonus only applies to sales above quota — the $5,000 of overage, not the full $25,000 — which is a common structure for rewarding reps who exceed their target without double-paying on sales that were already commissioned normally.
Working backward: sales needed for a goal
Flip the simple formula around and you get: sales needed = desired commission ÷ rate. Want to earn $5,000 at a flat 10% rate? You need $50,000 in qualifying sales. This version is useful for setting a personal sales target from an income goal, though it assumes a flat rate — for tiered or base-plus-commission plans, the math needs to account for which bracket or component the goal falls into.
Related calculators
To see how commission income fits into your overall pay, the salary calculator and take-home paycheck calculator translate gross earnings — commission included — into what actually lands in your bank account after taxes.