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

https://domgodwinson38.gumroad.com/p/why-do-reviews-only-mention-the-160-messages-cap-and-not-the-reasoning-cap

ChatGPT Plus is listed at $20 per month, but the actual price you pay can range from about $13 to $27 depending on where you buy it. This difference comes from factors like local taxes (VAT or GST) and fees added by app stores, like Apple or Google Play