ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from...

https://telegra.ph/How-Do-I-Compare-ChatGPT-Plus-Prices-on-Web-vs-iOS-vs-Android-08-05

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary from about $13 to $27. This happens because of taxes like VAT or GST and additional fees applied by app stores on iOS or Android