Every future charge stops immediately, and the card we hold for the subscription is deleted in the same step — no renewal can be charged.
Priority Review keeps covering your new applications until the end of the month you already paid for, then ends. Applications you already sent keep their Priority Review.
If this month's charge was already authorised before you cancelled, it still completes and it's the last. Payments already made aren't refunded. You get a confirmation e-mail, and your subscription page shows the dates. To subscribe again, choose Priority Review on a future application.
Something not right with a charge?
Send a change request: billing mistakes our records prove are refunded automatically, and a person answers the rest within two business days.