If you need additional pages, they are automatically provided in blocks for only $1. If you do not print all of your plan pages in a month, you can roll over up to the number of pages per month in your plan. Your monthly fee pays for ink, shipping, and recycling. The plans are based on the number of pages that you print, not on how many ink cartridges you use.
When you enroll in an HP Instant Ink plan, you pay a monthly fee to print a defined number of pages per month.