ChatGPT Plus is listed at $20 per month, but the actual price you pay can range...

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

ChatGPT Plus is listed at $20 per month, but the actual price you pay can range from about $13 to $27. This difference comes from added taxes like VAT or GST and app store fees if you subscribe on iOS or Android