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

https://rowanscoolperspective.iamarrows.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 vary between $13 and $27. This difference comes from extra fees like VAT or GST, and additional charges on app stores for iOS or Android