Basic Invoice Template
If you are searching for something very easy for using, without all the special features that may make some invoice documents much more complicated than they have to be, you are free to download Basic Invoice Template. Provided template grants ability to complete the invoice down to bare essentials.
Here is just a basic invoice. If this template is not suitable for you, so you are free to add other invoices, sleeps, sheets and other related documents, which uses the same style but contains more features.