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

https://garrettsbestblogs.theglensecret.com/if-i-take-a-chatgpt-plus-trial-will-it-charge-20-after

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