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

https://page-wiki.win/index.php/How_Do_I_Get_the_12_Month_ChatGPT_Plus_Military_Program%3F

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