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

https://suprmind.ai/hub/chatgpt/pricing/chatgpt-plus-price/

ChatGPT Plus is listed at $20 per month, but the actual price can vary between about $13 and $27 depending on your location and platform. The main reason is extra taxes like VAT or GST, and app stores like Apple and Google add their own fees