Can a discount for renewal be used in advance?

New user here. Gotta study but also watch expenses. I am wondering if I get the Pro plan now, and then , say in some months, would come across a discount offer, I then could use that discount towards the next cycle’s Pro plan , months in advance.
For example: update to pro in September 2021, receive and use a coupon in January 2022 which will then become effective at the end of the current cycle, in September 2022 until September 2023.
I might be able to justify the expense for pro now if I knew that wouldn’t lock me in with that price for longer than necessary.

(Also suggesting to reconsider pricing for people living in Asia and Africa, as many app devs do, but aware that’s not a help question for this forum.)

I’ve never seen a discount offer