Unfortunately its not that simple, which is why I posted. The issue that may arise based on the poll question is employee vs. independent contractor (or contract labor as you used the term). The reason it matters is that employers have to withhold and pay over income taxes for their employees and report the income of their employees to the IRS on quarterly forms (941). Employers also have to pay a "match" to the IRS for each employee's income tax. Employees also need to be covered by worker's comp ins. Independent contractors on the other hand are self employed, and the business that hires them has to prepare 1099 forms for each independent contractor who has provided more than $600 of services at year end so that the business can deduct that amount on its' year end taxes. No wage withholding is required for independent contractors. Some of the considerations include whether you can control how the worker does his job; if he is washing cars do you tell him how to do it, supervise his work, leave him alone to do it however he wants, does he provide washing services for other businesses, does he use your products and towels, does he provide his own products and tools and do you reimburse him for those?
The method that the business chooses to pay workers, percentage or commission or hourly amount or whatever, does not by itself determine whether that worker is an employee or an independent contractor. You can absolutely have employees who are paid a commission or a piecemeal amount based on a given job or sales quota, etc. You can also have independent contractors who are paid a rate based on the number of hours they spend on a task.
The consequences of not properly classifying workers can be severe as far as the IRS goes; specifically meaning an audit and requirement to pay all the withholding taxes that should have been paid for those workers you considered "independent contractors" along with a pretty hefty fine and interest for the money the IRS considers you to have failed to pay in those quarters that you improperly paid employees as independent contractors.
The IRS guidelines for who is an employee and who is an independent contractor is listed on their website.
Choose wisely, and remember that the IRS almost always comes down on the side of classifying workers as employees (more money for the Gov't).
Independent Contractor (Self-Employed) or Employee?