ChatGPT Plus lists at $20 a month but your actual cost can differ by country...

https://www.deltabookmarks.win/the-listed-price-for-chatgpt-plus-is-20-but-the-actual-cost-you-pay-often

ChatGPT Plus lists at $20 a month but your actual cost can differ by country and device. That’s because taxes like VAT or GST apply depending on where you live. If you subscribe via an app store, they add their own fees on top