ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from...

https://ace-wiki.win/index.php/ChatGPT_Plus_File_Upload_Failed:_Is_It_the_20MB_Image_Limit%3F

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from about $13 to $27. This happens because of taxes like VAT or GST and additional fees applied by app stores on iOS or Android