Your break fee should be zero at the moment – but it is volatile because wholesale interest rates are volatile, so confirm it with KBC (and please post it here when you receive it). In your case, it is extra volatile because there is so long left on your fixed rate.
- Switching immediately to KBC's 5-year fixed rate (2.4% with no cashback) will save you about €2,750 over the next 4 years versus staying on your current rate – and is very simple and quick to do (no bank statements, salary cert or solicitor, etc., needed), and there are no fees, except possibly a valuation fee (€150)
Of course, if you decide to stay with KBC and switch to their 2.4% rate, you might want to switch again in 5 years when your fixed rate expires and your mortgage moves onto Bank of Ireland's books, at which point you will be subject to their (probably higher) interest rates. Unless you are then in a position to pay off a large part of your remaining balance, which would mean that higher interest rates wouldn't matter as much.
- Switching immediately to Haven Mortgages Limited's 4-year green fixed rate (2.0% with €2,000 cashback) will save you about €4,860 over the next 4 years
- Switching immediately to AIB's 5-year green fixed rate (2.1% with €2,000 cashback) will save you about €4,460 over the next 4 years
- Switching immediately to Avant Money's 7-year fixed rate (1.95% with no cashback) will save you about €3,020 over the next 4 years
- Switching immediately to Avant Money's 10-year fixed rate (2.1% with no cashback) will save you about €2,440 over the next 4 years
These savings estimates use for comparison the scenario of doing nothing, and assume that your monthly repayment continues at €660, i.e., you continue the €100/month overpayment. The estimates also account for fees and cashback.
For any of the above products (rates), you may incur a break fee if you pay off a large part of the mortgage before the fixed term expires, so think about when you might be making this large payment and choose the product with the most-appropriate fixed term for your needs.
Note: the Avant savings estimates assume that you are
not eligible for the €1,500 cashback. To be eligible, the switch to Avant has to be underway before the end of March and you must use a broker who is an Avant "Gold Partner". I don't know what "underway" means but if you are inclined to try to beat the deadline you could talk to an Avant Gold Partner as soon as possible and see if it is possible.