Hi SSE
If you put the money on deposit now at 0% interest, this is what your mortgage will look like after 5 years (based on €250,000 @2.5% over 31 years.) Your repayments will be €966 per month.
View attachment 3313
If you keep up the same repayment of €966 per month and pay €90k off now but withdraw €18k a year for 5 years, your account will look something like this.
View attachment 3314
So you save €6,361 - which ties in with GNF's €6,750. I have underestimated the interest a bit.
You will then owe about €215k over 26 years, instead of owing €221k over 26 years.
So this doesn't really make any sense:
If you overpay by €90k now and withdraw it over 5 years, the capital figure will be lower than it would otherwise have been had you not overpaid it.
But of course, if you overpay €90k now and withdraw it, the capital figure will be higher than if you had not withdrawn it.
Brendan