ChatGPT Plus has a list price of $20 per month, but the actual amount you pay...

https://garrettwigp625.tearosediner.net/is-chatgpt-plus-cheaper-on-the-app-store-in-italy

ChatGPT Plus has a list price of $20 per month, but the actual amount you pay can range from about $13 to $27. This difference is due to factors like local taxes such as VAT or GST and extra fees charged by app stores for iOS and Android