ChatGPT Plus lists at $20 per month, but the actual price you pay can vary...

https://www.bookmarkidea.win/chatgpt-plus-is-advertised-at-20-a-month-but-the-actual-price-you-pay-can

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary between $13 and $27 depending on where you subscribe. This difference comes from extra fees like VAT, GST, or app store charges added on top