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

https://tango-wiki.win/index.php/How_Early_Should_I_Cancel_ChatGPT_Plus_to_Avoid_Being_Charged%3F

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