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Track uninvoiced (pre-invoiced?) expected income in Quicken
You are right on track with your idea of setting up a separate account for invoiced income. Create a new account with the type other asset and call it "Receivables" (or something similar). Every time you invoice a client, enter a credit to this account with the amount of the invoice. Once the client pays and you deposit a check, enter a transfer from the "Receivables" account to the bank account. EDIT I overlooked that you wish to account for not-yet-invoiced income. I think that's a bad idea. It will become confusing and will give you the false sense that your financial condition is better than it really is. There are plenty of stories about businesses that have stellar sales, but fail because of lack of cash flow (the business' bills become due before it gets paid by its own customers).