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

https://dibz.me/blog/is-there-a-chatgpt-plus-free-trial-i-can-click-to-start-1223

ChatGPT Plus has a listed price of $20 per month, but the actual amount you pay can range from about $13 to $27. This variation happens because of things like taxes (VAT or GST) and extra fees added by app stores such as Apple’s or Google’s