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

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

ChatGPT Plus is advertised at $20 per month, but the actual price can range from about $13 to $27 depending on where you subscribe. This difference comes mainly from taxes like VAT or GST, and extra fees from app stores like Apple or Google