Hi Blackrock
If the person sells their own home well in advance of looking for a new home, then the issue does not arise. They sell their old home and get the net cash after paying off their mortgage.
But many people try to synchronise both so that they can move out of their old home one day and move into their new home the same day or a few days later.
I think that a typical timeline is as follows:
Get mortgage approval in principle to buy a new home with a mortgage of 80% of the purchase price
Day 1 - Go sale agreed on existing home
Day 10 Go purchase agreed on new home and pay €5,000 holding deposit
Day 50 Exchange contracts for sale of existing home
Day 60 Exchange contracts on purchase of new home - 10% deposit required - say €90k
Day 80 Close sale of existing home and receive funds after the mortgage is discharged.
Day 90 Close purchase of new home
So the problem is that on Day 60, the buyer needs to come up with the 10% deposit to exchange the purchase.
Brendan