The freelance design invoice is reserved for billing an individual who has hired an independent contractor to complete a job involving visual or graphic design. As the digital world becomes more complex, people are likely to turn to freelance designers to help them create, develop and enhance products or services. The costs associated with design vary due to the different forms of design used for a particular task, such as UX, UI, IA, or IXD. A freelance design invoice describes all the tasks completed by the designer and the cost associated with each task. At the bottom of the invoice, the designer will enter the total amount due and the date by which the payment must be made.