be written off as an expense. Business assets, improvements, note: You can elect to deduct or amortize certain business start-up costs. In general, you can deduct rent as an expense only if the rent is for property you use in your trade or business. Read through the list to be sure you don't miss any of these expenses. It's a complicated subject and one that a tax professional should help you tackle. In addition, you may need specialized insurance, like malpractice or product liability insurance. You should also have business interruption insurance, which pays if you can't use your business location for a period of time. Some equipment that you purchase for your business is considered listed property, a special IRS category that requires you to keep business and personal costs separate. If you use your car for both business and personal purposes, you must divide your expenses based on actual mileage. A necessary expense is one that is helpful and appropriate for your trade or business. Insurance - Generally, you can deduct the ordinary and necessary cost of insurance as a business expense, if it is for your trade, purple wedding theme reception business, or profession. For a list of current and prior year mileage rates see the Standard Mileage Rates.