ChatGPT Plus has a $20 list price, but the actual cost you pay can range from...

https://highstylife.com/i-keep-hitting-chatgpt-limits-should-i-start-a-new-thread/

ChatGPT Plus has a $20 list price, but the actual cost you pay can range from about $13 to $27. This happens because taxes like VAT or GST vary by location and app stores add fees on top