Once you understand how commission rates are structured, the calculation itself is straightforward arithmetic. The trick is using the right method for how your deal is priced, and remembering that the headline commission is not your take-home. This guide shows you how to calculate a commercial leasing commission for each common structure, with worked examples, and points you to a calculator that does it for you, including the part most tools skip: how the commission divides between the execution and occupancy halves.
If you just want the number, use the interactive commission calculator. Enter the square footage, term, rent, and rate, set your co-broke and house split, and it returns the gross commission, your take-home, and the execution-versus-occupancy breakdown. It is also embeddable, so partners can host it on their own sites. The rest of this guide explains the math behind it.
The most common structure. You apply a commission percentage to the total value of the lease over its full term. The steps:
Worked example. A 10,000 square foot space, at $32 per square foot per year, on a 7 year term, has a total lease value of 10,000 times 32 times 7, which is $2,240,000. At a 4 percent commission, the gross commission is $89,600. That is the full deal commission, before any co-broke or house split.
In some markets and asset types, the commission is a set dollar amount per rentable square foot rather than a percentage. The math is simpler:
Worked example. The same 10,000 square foot space, at a commission of $6 per square foot, produces a gross commission of $60,000. Some agreements express the per-foot commission per year of term instead of one time, so always confirm which the agreement means before you calculate.
On longer leases, the rate often steps down over the years, a higher percentage on the early years and a lower one on the later years. To calculate, apply each tier's rate to the lease value for the years it covers, then add the tiers together. Sliding scales reward the early years more heavily, so the structure matters as much as the headline rate. Because the tiers vary by agreement, this is where a calculator earns its keep.
The gross commission is rarely what you keep. Two more steps usually apply.
So your take-home is the gross commission, times your side's share of any co-broke, times your keep after the house split. The calculator runs all three layers for you.
Even your take-home does not all arrive at once. It splits between the execution half, paid on signing, and the occupancy half, paid when the tenant occupies, which often means months later behind a build-out. Knowing that breakdown is the difference between planning your cash flow and being surprised by it. The calculator shows both halves, and the reason the occupancy half gets stuck is covered in the guide on the 50/50 trap.
This guide is about the method. If you need actual rate benchmarks to plug in, broken out by market and asset class, see the data guide on average commercial leasing commission by US market. And for what drives a rate up or down in the first place, see the guide on what a typical commission looks like.
Most commonly, multiply the total lease value (square feet times annual rent times term) by the commission percentage. For per-square-foot structures, multiply the square footage by the commission dollars per square foot. Then apply any co-broke and house split to reach your take-home.
For percentage-based commissions, yes, it is usually calculated on the total lease value across the full term, which is why longer leases produce larger commissions even at the same rate.
Yes. It applies your co-broker side share and your house split, and it breaks the result into the execution and occupancy halves so you can see what arrives when.
This guide and the calculator provide general estimates for commercial real estate brokers and are not financial, tax, or legal advice. Actual commissions depend on your agreement. Confirm figures against your commission agreement.
