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

https://www.click-bookmark.win/chatgpt-plus-has-a-list-price-of-20-per-month-but-the-actual-cost-can-vary

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 extra fees like VAT or GST, and app store charges on iOS and Android