ChatGPT Plus has a listed price of $20 per month, but the actual cost you pay...

https://garrettsbestblogs.theglensecret.com/if-i-take-a-chatgpt-plus-trial-will-it-charge-20-after

ChatGPT Plus has a listed price of $20 per month, but the actual cost you pay can vary from about $13 to $27. This difference comes from factors like local taxes (such as VAT or GST) and extra fees added by app stores on iOS and Android