Invoice details: Across from where you put the recipient's name and contact info, include the details of your invoice. This placement makes it easy to keep track of vital information — for both you and the recipient. It doesn't matter what kind of numbering system you use, just make sure it's in sequential order so you don't get confused.
The client's contact information: Now you'll want to specify who the invoice is being made out to. Include the recipient's name, address, phone number and any other info below the invoice header. Generally, your contact info should be on the opposite side of the recipient's info. So if your business name and logo are on the right side of the invoice at the top, the client's name and info should be below this on the left side.