ChatGPT Plus is listed at $20 per month, but the amount you pay varies 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 per month, but the amount you pay varies from about $13 to $27 depending on where you subscribe. This difference comes from extra charges like VAT or GST in your region and the app store fees on iOS and Android devices