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

https://dallasssplendidinsight.yousher.com/chatgpt-plus-vs-pro-is-pro-actually-smarter-or-just-more-quota

ChatGPT Plus is listed at $20 a month, but the actual price you pay often ranges from $13 to $27. This difference comes from extra taxes like VAT or GST and fees added by app stores such as Apple’s or Google’s