Based on this previous thread, you should simply have to ring AIB to confirm the zero break fee and it should be straightforward to break and refix
Any customer currently on their 3 or 5 year fixed rates can break for free, and refix now at the lower rates. This is because of an extra calculation that AIB do looking at their own interest rates, so because they provide 2 & 4 years rates higher than the existing 3 & 5 year rates, they cannot...
www.askaboutmoney.com
Why do you think you will lose this flexibility with the 5 year rate? The same logic applies. All of AIB's 1-4yr rates are equal or higher than the 5 year rate so there should be no break fee for overpayments unless there is a big change in AIB's short term rates
Moderator's note: Because of a quirk in how AIB calculate their break fee / early redemption charge, you can make unlimited overpayments on some of their fixed rates without penalty. Or you can break out of your existing AIB fixed rate and re-fix on a different rate, again without penalty. (You...
www.askaboutmoney.com
Likewise, you should not have any break fee based on the same methods applied above by AIB