When does my cancellation take effect / will I keep access through the end of my paid period?

Your access continues through the end of your current billing period. If you cancel mid-month or mid-year, you will keep full Insider access until your paid term ends, and you will not be charged again. 

After your paid period ends, your account remains in place — you can resubscribe at any time without creating a new account (see How do I reactivate/resubscribe after cancelling for more information).