That is a disappointing article from Conor Pope.
“The mortgage holder could knock almost €54,000 off the cost of their loan,” says Frank Conway, director of moneycoach.ie.
It stems from a failure on the part of Conor and the Moneycoach to understand the time value of money. Indeed, most people don't understand this.
The "€54,000" is over 30 years. A euro in 30 years time will be worth a lot less than a euro today. So adding them up is a meaningless, exercize.
You should review the cost of your mortgage on an annual basis based on the APR. So if you have an interest only mortgage of €300,000 @ 5%, the true cost of your mortgage is €15,000. It will be less if it's a repayment mortgage. It will be a bit less again, if you pay your monthly repayment a bit earlier.
So if you have money sitting in your current account earning no interest, it is better to pay it against your mortgage. You will save a few hundred 2011 euros by doing so. Review the strategy next year and remember that you are then dealing with 2012 euros.
He may as well have said "How to save €279,000 on your mortgage". The answer repay your mortgage in full today, so you don't have to pay any interest.
Exactly how much will you save this year by paying your mortgage twice a month, instead of monthly?
300,000 @ 5% for 30 years will result in a monthly repayment of €1610.46
If you pay €805 in the middle of January, instead of at the end of January, you will save €1.55 in interest. If you do this every month in the year, you will save €18.57 that year. In other words, your mortgage will be €18.57 lower at the end of that year.You can round this up to €20 to allow for interest on interest saved.
This is the correct way of looking at it.
Note the difference between "twice a month" and "every two weeks"
This is imporant. Twice a month is 24 payments a year. Every two weeks is 26 payments a year. If you make more payments you will pay off your mortgage quicker.
Edit: It appears that Conor's calculations are based on making fortnightly payments, so you would be actually paying an extra €1,800 each year. So, of course this is going to save you interest.
You probably should not make any change to a tracker mortgage
It is likely that the lenders will offer some incentive to people to increase their repayments on a tracker mortgage. If you have already done so, they won't give you an incentive. See this post
"Bank won't revert mortgage term"