ChatGPT Plus is listed at $20, but the actual price you pay can vary from about...

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

ChatGPT Plus is listed at $20, but the actual price you pay can vary from about $13 to $27. This depends on things like VAT or GST taxes in your country or extra fees added by app stores on iOS and Android