What's the difference between Section 179 and Bonus Depreciation?
Bonus depreciation is offered some years, and some years it isn't. Right now in 2022, it's being offered at 100%.
The most important difference is both new and used equipment qualify for the Section 179 Deduction (as long as the used equipment is "new to you"), while Bonus Depreciation has only covered new equipment only until the most recent tax law passed. In a switch from recent years, the bonus depreciation now includes used equipment.
Bonus Depreciation is useful to very large businesses spending more than the Section 179 Spending Cap (currently $2,700,000) on new capital equipment. Also, businesses with a net loss are still qualified to deduct some of the cost of new equipment and carry-forward the loss.
When applying these provisions, Section 179 is generally taken first, followed by Bonus Depreciation - unless the business had no taxable profit, because the unprofitable business is allowed to carry the loss forward to future years.

Section 179's "More Than 50 Percent Business-Use" Requirement
The equipment, vehicle(s), and/or software must be used for business purposes more than 50% of the time to qualify for the Section 179 Deduction. Simply multiply the cost of the equipment, vehicle(s), and/or software by the percentage of business-use to arrive at the monetary amount eligible for Section 179.
Please visit www.Section179.Org for more information.