You can stop an instance temporarily if you no longer need it and restart it at a later time. A stopped instance retains its persistent disks, its internal IPs, and its MAC addresses. However, the instance shuts down the guest OS and loses its application state.
A stopped instance does not incur charges, but all of the resources that are attached to the instance will still be charged.
For example, you are charged for persistent disks and external IP addresses according to the price sheet, even if an instance is stopped.
To stop being charged for the attached resources, you can reconfigure a stopped instance to not use those resources, and then delete the resources.
Hope this helps!