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

https://www.cast-bookmarks.win/chatgpt-plus-is-listed-at-20-but-the-actual-price-you-pay-can-vary-between

The listed price for ChatGPT Plus is $20 a month, but the actual cost you pay can range from about $13 to $27. This difference happens because of taxes like VAT or GST, and extra fees added by app stores on iOS and Android