It was one of several questions - sorry I tend to do that

if it is not net present valued then surely the calculations are off - won't that push the ownership beats renting even further out in time?

Also I did not see if it was interest only vs repayment (one of the biggest issues IMO)

Hope this helps. When Apple says their 2015 forecast for sales is $200B (made that up) that is not a number that is PV'd (because that is 2015 number). Similarly when we are modeling your income going forward those are not numbers that should be PV'd.

However, when we sum future expenses or cash flows (across years) and present them as a single number, generally in today's money, those values are all PV'd. For example, on our mortgage comparison page the total expenses over the amount of time you plan on holding the mortgage is a number we PV.