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

https://wakelet.com/wake/_ACH6Tp_ms7-OEVRlOcTd

ChatGPT Plus is listed at $20 per month, but the actual price you pay can vary between about $13 and $27. This difference comes from extra fees like VAT or GST and app store markups on iOS and Android