Most industries have some form of regulation, weather administered by a professional organization, State Board or governmental statute. They all specify the information required to make the invoice comply with their requirements. Often these rules and regulations go unknown until issues arise with the invoice in question. Very few shops have the knowledge of what is exactly required. This often results in these documents lacking critical information that is required by law. By missing required information, you open the door for the State to levy and collect fines, lawsuits from the customer or charge backs from the manufacturer during an audit. Regardless of the reason, the outcome is the same; a loss of income.