ChatGPT Plus has a list price of $20 per month, but the actual cost you pay can...

https://wiki-nest.win/index.php/Why_Do_Referral_Codes_Not_Stack_for_ChatGPT_Plus_Trials%3F

ChatGPT Plus has a list price of $20 per month, but the actual cost you pay can range from about $13 to $27. This difference comes from extra charges like VAT or GST and app store fees on iOS and Android