ChatGPT Plus lists at $20 a month, but your actual cost can differ depending on...

https://chloesbrilliantjournal.capitaljays.com/posts/what-should-i-do-right-now-to-avoid-an-accidental-20-renewal-after-a-trial

ChatGPT Plus lists at $20 a month, but your actual cost can differ depending on where you live and how you subscribe. Taxes like VAT or GST vary by country and add to the price. If you buy through an app store, expect extra fees from their markup