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

https://gregorysbrilliantchat.lucialpiazzale.com/is-chatgpt-plus-cheaper-on-the-app-store-in-italy

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 factors like taxes (VAT or GST) and extra fees from app stores such as Apple or Google