ChatGPT Plus officially costs $20 a month, but the actual price you pay can...

https://sierra-wiki.win/index.php/Why_Does_ChatGPT_Plus_Cost_More_Than_$20_for_Me%3F

ChatGPT Plus officially costs $20 a month, but the actual price you pay can vary from about $13 to $27. This difference comes from factors like taxes such as VAT or GST and extra fees charged by app stores on iOS and Android