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

https://smart-wiki.win/index.php/Why_Is_ChatGPT_Plus_Around_$27_in_Denmark%3F

ChatGPT Plus is listed at $20 a month, but the actual price you pay can vary between $13 and $27 depending on where you sign up. Differences in taxes like VAT or GST and app store fees can change the final cost