The technical definitions for combustible dust vary. In Canada, the Hazardous Products Regulation (WHMIS 2015) defines combustible dust as  a mixture or substance that is in the form of finely divided solid particles that, upon ignition, is liable to catch fire or explode when dispersed in air.
Some rewards from employee incentive contests are exempt from income tax. Such rewards must be tangible personal property, for example, material goods that are for personal use and that are not deductable from the companyâs operating costs. Such rewards are not classified as income, but only up to the value of $1,600.
Many employee fringe benefits are exempt from payroll taxes, both Federal Insurance Contributions Act (FICA) or Federal Unemployment Tax Act (FUTA) taxes, as long as certain requirements are met. And because they are not taxable to the employee for income tax purposes, there is no need to withhold income tax on the value of the payments. There are certain fringe benefits that are not totally exempt from payroll taxes. For example, an employee fringe benefit may be exempt from withholding, but still subject to FICA and FUTA taxes.