ChatGPT Plus is listed at $20 a month, but the actual price you pay often...

https://ericksexcellentblog.image-perth.org/chatgpt-plus-message-limit-is-it-really-160-messages-per-3-hours

ChatGPT Plus is listed at $20 a month, but the actual price you pay often ranges from $13 to $27. This difference comes from extra taxes like VAT or GST and fees added by app stores such as Apple’s or Google’s