ReckonBoxWhat the sale actually pays
A commission is a share of a sale paid to the person who made it, either a flat rate on everything or a graduated rate that climbs by band. The flat version is one multiplication. The tiered version is where the money, and the confusion, lives.
A flat 5% commission on $50,000 of sales is $2,500, plus any base salary. Switch to a tiered plan and a $27,000 sale under a 3%, 5%, 10% structure pays $1,050, not the $2,700 that reaching the 10% tier might suggest.
Tiers pay band by band, like tax brackets
A tiered commission applies each rate only within its own band, so hitting a higher tier does not put your whole sale at that rate. This is the single most misread part of a commission plan.
Take 3% on the first $20,000, 5% on the next $5,000, and 10% above $25,000. On a $27,000 sale, the split is $20,000 at 3%, $5,000 at 5%, and $2,000 at 10%, which is $600 plus $250 plus $200, or $1,050. Only the $2,000 that sits above the top threshold earns 10%. Reading the top tier as covering the whole sale would nearly triple the figure:
| $27,000 sale, graduated tiers | Commission |
|---|---|
| First $20,000 at 3% | $600 |
| Next $5,000 at 5% | $250 |
| Above $25,000 at 10% | $200 |
| Total | $1,050 |
| Top rate on the whole sale (wrong) | $2,700 |
The effective rate is the honest one
Your effective commission rate is the total commission divided by total sales, and it sits well below the top tier. On $1,050 from $27,000, the effective rate is 3.9%, not the 10% the headline band advertises.
That gap is why a plan is best judged on its effective rate. A 10% top tier that only kicks in past $25,000 is worth far less to someone selling $27,000 than to someone selling $200,000. The tool prints the effective rate so two offers can be compared on what they actually pay.
Where the numbers come from
A flat commission is the sales amount times the rate, and any base salary is added on top for total pay. A tiered commission slices the sale at each threshold, multiplies each slice by its band rate, and sums them, exactly as an income tax bracket works. The effective rate is that total commission divided by the sale, and the flat-on-the-whole figure applies the top rate to everything to show what the graduated structure saves the employer.
The tiers here use two thresholds and three rates, which covers most graduated plans; a plan with more bands follows the same band-by-band logic.
What this does not cover
This computes the commission earned, before the payroll system takes its cut. It does not model the tax and withholding on commission income, which is often taxed at a higher supplemental rate, draws against future commission, clawbacks on returned or cancelled sales, or quotas and accelerators that change the rate once a target is passed. Real estate splits between agent and broker are their own calculation.
None of this is advice on a compensation plan or a career move. It shows what a given structure pays on a given sale. For an offer that turns on quotas and accelerators, read the plan document closely and ask for the effective rate at your expected sales.
Frequently asked questions
How do I calculate a sales commission? A flat commission is the sales amount times the commission rate. On $50,000 of sales at a 5% rate, that is $2,500. If you also earn a base salary, the total pay is the base plus the commission. This is the simplest structure, where every dollar of sales earns the same rate.
How does a tiered or graduated commission work? A tiered commission applies each rate only within its own band, like a tax bracket, not the top rate to the whole sale. With 3% on the first $20,000, 5% on the next $5,000, and 10% above $25,000, a $27,000 sale earns $600 plus $250 plus $200, which is $1,050. Only the amount inside each band is paid at that band rate.
Does a higher commission tier apply to all my sales? No, and assuming it does is the common mistake. Reaching the 10% tier does not put your whole sale at 10%. On $27,000 with the tiers above, the graduated commission is $1,050, while applying 10% to the full $27,000 would wrongly suggest $2,700. Only the sales above the tier threshold earn the higher rate.
What is my effective commission rate? The effective rate is your total commission divided by your total sales. On a $1,050 graduated commission from $27,000 of sales, the effective rate is about 3.9%, well below the 10% top tier. The effective rate is the honest figure to compare plans by, since a headline top rate rarely reflects what you actually earn.
How do I calculate base salary plus commission? Add the fixed base salary to the commission earned on sales. On a $40,000 base with a 5% commission on $50,000 of sales, the commission is $2,500 and the total pay is $42,500. The base is guaranteed regardless of sales, while the commission portion rises and falls with what you sell.