The adjective projected describes something that is predicted or estimated, or parts of something that extend beyond the rest, like projected pillars that rise above a building's roof.
The verb project can describe a prediction about the future. When you project something, you analyze the facts you have and use that to create a calculation or estimate of how an upcoming event will turn out. Projected, the adjective form of project, is used to describe such a prediction. For example, if you figure out ahead of time how much you’ll owe in taxes, that amount would be your projected taxes.