As a reminder to our Corporate Bookkeeping clients, I would like to point out the need to support your deductions with the requisite receipts. We can talk about it hypothetically and you can order things online realistically, but unless you have a printed receipt, you may be out of luck when the IRS comes knocking.
For example, the rules for documenting restaurant and entertaining costs state that the receipt must include a vendor name, date and amount spent. It goes on to require that you further note with whom you were entertaining and to include the purpose of the meeting. Even then there are percentages to the totals that will be considered but your job in turning in receipts is to turn in complete receipts.
What everyone also needs to start paying more attention to are preparing and supplying documentation for purchases made from online or generic product vendors such as Amazon.com, PayPal, Walmart, Costco and others. You can buy a boatload of office supplies from any of these vendor or you could buy a trunkload of personal groceries. You need to be honest to yourself and fair to your bookkeeper and accountant that what you are claiming as a business expense is in fact a deductible business expense.