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

https://www.bookmarking-fox.win/chatgpt-plus-has-a-20-list-price-but-the-actual-cost-you-pay-can-range-from

ChatGPT Plus is officially $20 per month, but the actual price you pay can vary from about $13 to $27. This happens because taxes like VAT or GST and extra fees from app stores add costs