Help with this tax scenario please, relevant information is that it uses 2018 U.S tax laws.

You have a client and they formed a corporation with 5 of their friends. All of the people were required to put in $50,000 or assets valued at the same into the company, but only 1 was going to work full time for the company. What is the tax effect to the contributors and what rate would they be taxed at for this transaction?