If you plan to charge a customer a fixed fee for a service (for example,
preparation of an individual income tax return), create the invoice as usual.
When you choose the service from your Item list, you can edit the amount shown
in the Rate column as necessary.
Some customers and jobs may warrant a "fixed fee plus adjustments"
arrangement. You can create
an "other charge" type item called "Adjustment" to use on
You can track the costs of a job as you go. Even when you cannot pass through
expenses to a customer, it's important to know how much you're spending.