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

https://iris-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 between $13 and $27 depending on where you subscribe. This difference comes from extra fees like VAT, GST, or app store charges added on top