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

https://suprmind.ai/hub/chatgpt/pricing/chatgpt-plus-price/

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