Calculators my This post will be deleted if not edited to remove bad language!
You owe €166699.84 on your mortgage, and you're currently paying 4.5% (I'm assuming, since you say after the 1.25% decrease you'll be on 3.25%).
So you pay €7501.49 per year in interest, or €625.12 per month (€166699.84 x 0.045). So if you take this figure from your current monthly repayment, you'll get your capital payment for your remaining 31 years 7 months.
Your TRS amount per month on this figure, based on 22.5%, is €140.65 per month, taking your total interest paid down to €484.47.
Now if we multiply €166699.84 by your new rate of 3.25%, we get €5417.74 per year in interst, or €451.48 per month. Add your capital payment (that you worked out above), and you have your new monthly repayment.
Unfortunately, with the decrease in interest paid, your TRS will come down too.
So 22.5% TRS on €451.48, gives you a monthly interest payment of €349.90.
So by my reckoning, if all the above figures and percentages are right, you stand to save €134.57 per month.
Oh yeah, I'm bored here in work!