ChatGPT Plus is listed at $20, but the actual cost you pay can range from about...

https://blogfreely.net/samuel-wang09/chatgpt-plus-file-upload-failed-is-it-the-20mb-image-limit

ChatGPT Plus is listed at $20, but the actual cost you pay can range from about $13 to $27. This variation comes from factors like VAT or GST taxes and extra fees charged by app stores such as Apple’s or Google’s