If you operate a business, or you’re starting a new one, you know records of income and expenses need to be kept. Specifically, you should carefully record expenses to claim all the tax deductions to which you’re entitled. And you want to make sure you can defend the amounts reported on your tax returns in case you’re ever audited by the IRS. Be aware that there’s no one way to keep business records. On its website, the IRS states: “You can choose any recordkeeping system suited to your business that clearly shows your income and expenses.” But there are strict rules when it comes to deducting legitimate expenses for tax purposes. And certain types of expenses, such as automobile, travel, meal and home office costs, require...