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

https://www.slideserve.com/aaron_ward92/why-does-chatgpt-plus-cost-more-on-android-than-on-the-web

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