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

https://www.random-bookmarks.win/chatgpt-plus-is-listed-at-20-but-the-actual-price-you-pay-can-range-from

ChatGPT Plus is listed at $20 monthly, but the actual price you pay can vary between $13 and $27. Differences come from taxes like VAT or GST and extra fees from app stores on iOS and Android