ChatGPT Plus is listed at $20, but the actual price you pay can range from $13...

https://www.alphabookmarks.win/chatgpt-plus-s-list-price-is-20-per-month-but-the-real-cost-can-vary-between

ChatGPT Plus is listed at $20, but the actual price you pay can range from $13 to $27. This difference is mainly due to taxes like VAT or GST and fees added by app stores, especially on iOS and Android