ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from...

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

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from about $13 to $27. This happens because of taxes like VAT or GST and additional fees applied by app stores on iOS or Android