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

https://www.rankbookmarkings.win/the-listed-price-for-chatgpt-plus-is-20-per-month-but-the-actual-cost-can

ChatGPT Plus is listed at $20 a month, but the actual price you pay can vary from about $13 to $27. This difference comes from added taxes like VAT or GST and extra fees from app stores like Apple or Google