The phrase "a substantial commission" is correct and usable in written English.
It can be used when referring to a significant amount of money earned as a fee for services rendered, typically in sales or business transactions.
Example: "The salesperson earned a substantial commission after closing the deal with the major client."
Alternatives: "a significant commission" or "a considerable commission."
He was entitled to a substantial commission, but his boss took all the credit.
But the Cuban government charges a substantial commission for converting American dollars to pesos, Western officials point out.
The recruiter promised she'd make a substantial commission over a tiny base salary.
In her quest to honor her grandfather's request, Natalie, who is reeling from a recent divorce, meets Amitai Shasho, an Israeli art dealer who hunts for stolen paintings, returning them to their previous owners in exchange for a substantial commission.
I would have gotten a very substantial commission, but my boss took all the credit.
In sad contrast to Rubens, Rembrandt received only one substantial commission from a court.
At this point, he was several steps ahead of Tiepolo, who did not complete a substantial fresco commission until nearly a decade later.
The ICA job was the first substantial commission Maltzan landed after leaving Frank Gehry's office to start his own practice.
Conducted by Raphael Frühbeck de Burgos, the orchestra offered two of the strongest results from a history of substantial commissions: Hindemith's Concert Music for Strings and Brass (Op. 50) to open the concert, and Bartok's Concerto for Orchestra to close it.
Simmons also said in his complaint that the plans conducted business with an insurance company operated by Dow's wife, allowing her to receive "substantial commissions and business advantages," and that the plans employed Dow's brother-in-law in a "phantom" job.
"We were paid substantial commissions for doing very little work," Ms. Edwards said.
