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

https://www.rankbookmarkings.win/chatgpt-plus-has-a-list-price-of-20-but-the-actual-cost-you-pay-often-ranges

ChatGPT Plus is listed at $20 per month, but the actual price you pay can vary between $13 and $27 depending on your location and payment method. This happens because taxes like VAT or GST and app store fees get added on top