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

https://charliekzxa221.huicopper.com/what-does-chatgpt-plus-mean-by-two-limits-running-at-once

ChatGPT Plus is listed at $20 per month, but the actual price you pay can range from about $13 to $27 depending on where you subscribe. This difference is mainly due to taxes like VAT or GST and fees added by app stores on iOS or Android