ChatGPT Plus has a $20 list price, but the actual cost you pay can range from...

https://wool-wiki.win/index.php/Why_Can_the_Same_ChatGPT_Account_Have_Three_Different_Prices%3F

ChatGPT Plus has a $20 list price, but the actual cost you pay can range from about $13 to $27. This difference happens because of local taxes like VAT or GST and fees added by app stores like Apple or Google