I guess you could do it. You choose an accounting method when you file your first tax return. If you later want to change your accounting method, you must get IRS approval. If it is approved, each year your tax return will not match with the IRS records. It will create additional accounting. Unless you have a really good reason to do so, I would recommend against it. You can account for business and personal items using different accounting methods. For example, you can determine your business income and expenses under an accrual method, even if you use the cash method to figure personal items.
