ChatGPT Plus is advertised at $20 per month, but the actual cost can range from...

https://station-wiki.win/index.php/Why_Do_My_Answers_Get_Worse_After_I_Hit_a_Limit_on_ChatGPT_Plus%3F

ChatGPT Plus is advertised at $20 per month, but the actual cost can range from about $13 to $27 depending on your region. This variation happens because taxes like VAT or GST get added, and app stores on iOS and Android often apply extra fees