ChatGPT Plus lists for $20 a month, but the final cost varies by country and...

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

ChatGPT Plus lists for $20 a month, but the final cost varies by country and device. That’s because taxes like VAT and GST get added depending on your location. If you subscribe through an app store, expect a higher price due to their commission markup