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

https://hotel-wiki.win/index.php/ChatGPT_Plus_File_Upload_Limit_Per_Message:_Is_It_10_Files%3F

ChatGPT Plus is listed at $20 per month, but the actual price you pay can range from about $13 to $27 depending on where you subscribe. This happens because of factors like local taxes such as VAT or GST and extra fees added by app stores