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

https://www.mediafire.com/file/yjut74llakej1hf/pdf-37467-61545.pdf/file

ChatGPT Plus is listed at $20 per month, but the actual price you pay often varies between $13 and $27. This difference comes from extra taxes like VAT or GST and the fees added by app stores on iOS and Android