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

https://romeo-wiki.win/index.php/What_Is_the_Max_File_Size_for_ChatGPT_Plus_Uploads%3F

ChatGPT Plus is advertised at $20 per month, but the actual price can range from about $13 to $27 depending on where you subscribe. This difference comes mainly from taxes like VAT or GST, and extra fees from app stores like Apple or Google