ChatGPT Plus is listed at $20, but the actual price you pay can range from...

https://mega-wiki.win/index.php/Why_Did_OpenAI_Keep_ChatGPT_Plus_at_$20_Since_February_2023%3F

ChatGPT Plus is listed at $20, but the actual price you pay can range from about $13 to $27. This difference comes from factors like taxes (VAT or GST) and app store fees that get added on top