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 mainly from local taxes like VAT or GST and extra fees added by app stores on iOS and Android