This Microsoft Excel spreadsheet creates a professional time-billing invoice for customers. Type in the week-ending date, and the rest of the days of the week are automatically filled in; type in employee information, local and federal tax data, the hourly rate, start time, lunch time, and end time, and therest will be calculated in detail for you. You can send its simple fill-in-the-blank form through regular mail or email. Even the fine print can be taken care of by filling in blanks.