There are many ways in real estate to model payroll. Sometimes companies like to detail every single employee position in the company and have a very granular version of payroll included into the model. Typically, most companies model payroll on a per unit annual basis. This is how payroll is modeled at Top Shelf Models. Depending on the size of the project, location, demographic, and other factors, payroll could be anywhere from $650 - $1,800 per unit annually. Before finalizing any financial underwriting, one should check the payroll plan for employees against the market salaries in the same location as the project to make sure your assumptions are in line.