ChatGPT Plus lists at $20 per month, but the final price you see can be higher...

https://zaneznae304.lucialpiazzale.com/why-is-chatgpt-plus-more-expensive-on-iphone-than-on-the-web

ChatGPT Plus lists at $20 per month, but the final price you see can be higher depending on where you live and how you subscribe. That’s because of VAT or GST taxes in different countries and extra fees app stores add when you buy on a phone