Again this year has no extension discount for existing user :

"Players who join PlayStation Plus during PlayStation’s Black Friday promotion can save up to 30% on a 12-month membership. Current PlayStation Plus Essential members can save 25% on the remainder of their membership when upgrading a current plan to PlayStation Plus Extra, or save 30% when upgrading from PlayStation Plus Extra to PlayStation Plus Premium/Deluxe."

https://blog.playstation.com/2024/11/20/pla...6veyDv-UrnRxxjA

First, are you non-PS plus user?

Existing user only benefit from upgrading at 30% discount (Essential to Extra or Extra to Deluxe)

If you are existing user but wanna add extra year on you existing tier, no discount.

i think coz they realized many stack their subs