The listed price for ChatGPT Plus is $20 per month, but the actual cost you pay...

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

The listed price for ChatGPT Plus is $20 per month, but the actual cost you pay can vary from about $13 to $27. This difference comes from extra fees like VAT or GST in your region, plus app store charges when buying on iOS or Android