ChatGPT Plus has a listed price of $20 but the actual cost you pay can vary...

https://blogfreely.net/samuel-wang09/110caniavoidvatonchatgptpluswithavat_id

ChatGPT Plus has a listed price of $20 but the actual cost you pay can vary between $13 and $27. This difference comes from taxes like VAT or GST and extra fees added by app stores on iOS and Android