ChatGPT Plus has a list price of $20, but the actual cost you pay often ranges...

https://gregorysbrilliantchat.lucialpiazzale.com/is-chatgpt-plus-cheaper-on-the-app-store-in-italy

ChatGPT Plus has a list price of $20, but the actual cost you pay often ranges from $13 to $27. This difference is mostly due to extra charges like VAT or sales tax, and the app store’s markup when you subscribe on iOS or Android