ChatGPT Plus is listed at $20 per month, but the actual price often ranges from...

https://magic-wiki.win/index.php/Why_Is_ChatGPT_Plus_$33.99_AUD_on_Android_in_Australia%3F

ChatGPT Plus is listed at $20 per month, but the actual price often ranges from $13 to $27 depending on where you sign up. This happens because VAT, GST, or app store fees are added on top