ChatGPT Plus lists at $20 per month but what you actually pay can change...

https://simonsnewchat.rivetgarden.com/posts/what-is-chatgpt-go-for-8-and-who-should-pick-it-over-plus

ChatGPT Plus lists at $20 per month but what you actually pay can change depending on your country and device. That’s because taxes like VAT or GST get added on top. If you subscribe through an app store, there’s also a markup they charge