The listed price for ChatGPT Plus is $20 per month, but the actual charge can...

https://wiki-neon.win/index.php/ChatGPT_Plus_Price_in_Japan:_How_Much_Is_%C2%A53,000_in_Dollars%3F

The listed price for ChatGPT Plus is $20 per month, but the actual charge can vary between $13 and $27 depending on where you subscribe. This happens because of extra fees like VAT or GST in some countries, or app store markups on iOS and Android