Sales Commission, Explained
After reading this you can split any sale into its total commission, the salesperson's share, the house's share, and the money the seller keeps, and you can spot the mistakes that quietly change those numbers.
What a commission split actually is
A commission is a fee paid for closing a sale, quoted as a percentage of the sale amount. On a $10,000 sale at a 5% rate, the total commission is $500. That $500 rarely goes to one person. It is split. Some goes to the salesperson (the rep), the rest stays with the business that employs them (the house or brokerage).
So there are really four numbers hiding inside one sale:
- Sale amount
- The price the buyer pays. The base for every percentage below.
- Total commission
- Sale amount times the commission rate.
- Rep's share
- The salesperson's slice of the total commission.
- House's share
- What is left of the commission after the rep is paid.
- Seller's net
- Sale amount minus the total commission. The money the seller walks away with.
Keep the two percentages apart in your head. The rate is a percent of the sale. The rep's share is a percent of the commission, not of the sale. Mixing those two is the single most common error, and it changes the answer by a large margin.
When to use it, and when not
Use this split whenever a sale is priced and someone earns a percentage of it: a real-estate agent, an advertising agency taking a media commission, a broker, a marketplace that charges sellers a percentage, or a freelancer paid on referrals.
Do not use it as a full pay model. Many roles combine a base salary with commission, use tiered rates that rise after a quota, or cap the commission at a ceiling. Those need extra steps this simple split does not perform. And commission is a top-line cost, not profit. To see whether the sale is worth making after all costs, reach for a Margin Calculator or a Contribution Margin Calculator.
The formula and the intuition
Write the sale amount as A, the commission rate as r (in percent), and the rep's share as s (in percent of the commission). The total commission is:
Here C is the total commission in currency. Dividing by 100 turns the percent into a fraction, so 5% becomes 0.05.
The rep's take is that commission scaled by the share:
R is the rep's payout. The house keeps the remainder:
H is the house's share. Because R and H both come out of C, they always add back to C. Finally the seller keeps whatever the commission did not consume:
N is the seller's net. Notice the rep's share never touches N. However the commission is split between rep and house, the seller loses the same C either way.
A quick sanity check: R + H should equal C, and N + C should equal A. If either sum is off, you have applied a percentage to the wrong base.
A worked example with the demo numbers
A $10,000 sale at 5% with a 70% rep share
These are the tool's default values, so you can reproduce every figure with one click of the demo.
- Total commission:
10000 × 5 / 100 = 500. The commission pool is$500. - Rep's share:
500 × 70 / 100 = 350. The salesperson earns$350. - House's share:
500 - 350 = 150. The business keeps$150. - Seller's net:
10000 - 500 = 9500. The seller walks away with$9,500.
Check the sums: 350 + 150 = 500 (matches the commission) and 9500 + 500 = 10000 (matches the sale). Both hold, so the split is consistent.
How the split responds when you move the share
The rate r sets the size of the pie. The share s only decides how that fixed pie is cut. On the $500 commission, every 10 points of share moves $50 from the house to the rep. At 50% the rep gets $250; at 90% the rep gets $450. The seller's $9,500 does not budge.
Reading the results
Read the four numbers as answers to four different questions. Total commission is the cost of selling for the business. Rep's share is what to put on the salesperson's payslip. House's share is the margin the business retains to cover its own overhead. Seller's net is the number the seller cares about most, and it is often the one used to compare offers.
In real estate the split is usually not one step but two. The total commission is first divided between the buyer's brokerage and the seller's brokerage, then each brokerage divides its half with its own agent. To model that with a single-split tool, run it twice. Say a $300,000 home sells at 6%: the commission is $18,000, split 50/50 gives each side $9,000, and a 70% agent split turns one side's $9,000 into $6,300 for the agent and $2,700 for the brokerage.
| Rep share | Commission | Rep gets | House gets | Seller net |
|---|---|---|---|---|
| 50% | $500 | $250 | $250 | $9,500 |
| 70% | $500 | $350 | $150 | $9,500 |
| 90% | $500 | $450 | $50 | $9,500 |
Common mistakes
The errors below all come from applying a percentage to the wrong base or ignoring a cost the commission does not include.
Do not apply the rep's share to the sale amount. On the demo numbers, 10000 × 70% = 7000 is nonsense: the rep cannot earn $7,000 from a $500 commission. The share applies to the commission, not the sale.
- Confusing net with profit. The seller's net of
$9,500is what is left after commission only. It is not profit. Subtract the cost of the goods, fees, and taxes before calling anything profit. - Forgetting the rate is per sale, not per year. A
5%rate on each of 20 sales is 20 separate commissions, not one. - Ignoring tax and VAT. In many places commission is a taxable service. If the invoice adds VAT on top of the commission, the house does not keep the full H. An Invoice VAT Breakdown separates those lines.
- Treating a tiered rate as flat. If the rate jumps to
7%above a quota, a single flat rate will understate or overstate the payout on any sale that crosses the threshold.
Related tools
Commission is one line in a larger picture. To price a product so the commission still leaves a healthy margin, use the Markup Calculator. To find how many commissioned sales you must close to cover fixed costs, use the Break-Even Calculator. If you run a sales team on a cash cushion, the Burn Rate & Runway Calculator shows how long that cushion lasts, and the Payback Period Calculator tells you when an upfront investment in that team pays for itself.
Frequently asked questions
Is commission calculated before or after tax?
It depends on the contract. Most commissions are figured on the pre-tax sale amount, then any sales tax or VAT is handled separately. Read the agreement: a rate on the gross (tax-inclusive) price gives a larger commission than the same rate on the net price.
Why does the seller's net not change when I move the rep's share?
Because the rep's share only decides how the commission is divided between the rep and the house. The seller pays the same total commission either way. On the demo numbers the seller nets $9,500 whether the rep's share is 50% or 90%.
How do I model a two-tier real-estate split?
Run the tool twice. First split the total commission between brokerages, treating each brokerage's slice as its own commission pool. Then apply the agent's share to that pool. The example above turns $9,000 at a 70% agent share into $6,300 for the agent.
What is a typical commission rate?
Rates vary widely by industry, from around 1% to over 20%, so there is no single normal figure. Residential real estate has often sat near 5% to 6% total, but that is negotiable and changing. Always use the rate in your own agreement rather than a rule of thumb.
Does a higher rate always mean the rep earns more?
Only if the share stays fixed. A rep on a 4% rate with a 90% share earns $360 on $10,000, more than a rep on a 5% rate with a 70% share who earns $350. The two percentages work together.
These figures are educational estimates, not financial advice. Commission terms are set by contract and local law, so confirm the exact bases and rates with a qualified adviser before you rely on any number here.
Related tools
Break-Even Calculator
Units and revenue needed to cover all costs.
Margin Calculator
Price, cost or margin — and the markup alongside.
Burn Rate & Runway Calculator
Monthly burn and months until the cash runs out.
Invoice VAT Breakdown
Net, VAT and gross lines for an invoice.
Markup Calculator
Price from cost and markup, with margin shown.
Contribution Margin Calculator
Per-unit contribution and ratio for pricing.