CV for PhD application: should I list a job I am yet to start?
If you have formally accepted the position, you can use the word &quot;starting&quot; with your start date to indicate it. Either way, you will probably be asked about what you're actually doing while you're applying for a program, but adding it on there ensures that, at the very least, if you forget to update your CV or accidentally provide an older CV for some reason, your bases are covered and the viewer is able to see that what was a prospective job is now likely your current job.
Example:

Underwater Basket Weaver, Foo Inc., Oahu, HI
Starting July 2124

Don't add in stuff you do not 100% own.