When starting a business, you have to determine the method you are going to use for accounting and paying taxes. The two choices are the cash method and the accrual method.
Cash Method
If you are looking for simplicity, the cash method is probably your best accounting choice. Generally, income and deductions can be claimed when payment is actually received or made. This is best shown with an example.
I open a small business and have to order business cards and stationary. I receive the products and pay the invoice on November 18, 2005. Under the cash method, I can deduct the cost on my 2005 tax return.