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

https://speedy-wiki.win/index.php/ChatGPT_Plus_Pricing_Changes_Timeline_2023_to_2026

ChatGPT Plus is listed at $20 per month, but the actual price you pay can range from about $13 to $27. This happens because taxes like VAT or GST and fees from app stores get added on top