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

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

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary between $13 and $27 depending on where you subscribe. This difference comes from extra fees like VAT, GST, or app store charges added on top