According to https://support.kraken.com/hc/en-us/articles/201893638-How-trading-fees-work-on-Kraken the fees are less than 1%. (Note that there is no mention on this page that these fees only apply to a particular account type.)
However when I did fiat -> BTC and BTC -> fiat I was charged 1.5% for each transaction.
Delving further into the documentation, it appears to be the case that these fees were because I was using an intermediate account.
Can anyone confirm that if I upgrade to a pro account the fees will be the much lower (0.16%/0.26%)?
Did you ask the support team of the kraken anyway regarding to your question mate?
If not, you better inform or ask this query to them, it is because their exchange discretion to put any
rules and policy where all their traders need to follow. Now, if your going to ask my opinion regarding
this matter, I think even you go into pro account it will come up in the same manner for sure.