I have also included more information from our help guide below so you can be sure you are selecting the correct basis for your situation.
A method of bookkeeping in which you regard income or expenses as occurring at the time you actually receive a payment or pay a bill. A cash-basis report shows income only if you've received it, and expenses only if you've paid them. For example, if you haven't received a payment for an invoice yet, a cash-basis report on your sales doesn't include the amount of the invoice.
A method of bookkeeping in which you regard income or expenses as occurring at the time you ship a product, render a service or receive a purchase. Under this method, the time when you enter a transaction and the time when you actually pay or receive cash may be two separate events.
In Quicken, an accrual-basis report shows income regardless of whether all your customers have paid up, and expenses regardless of whether you've paid all your bills.
The complete help article is available here.
I hope this helps!