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 between $13 and $27 depending on your location and platform. This difference is mainly due to taxes like VAT or GST and app store fees added on top