Firstly, apologies if this is posted in the wrong section. One thing I've learnt, unfortunately already after starting our investment journey (but better late than never right?) is to have a goal and work backwards by choosing strategies and purchasing properties that work towards that goal. This is all good and well, except my math ability still fails me. Could someone please explain how to workout the following - I'd like to be shown how the math works so that if we decide to move the goalpoasts we can reassess, also others mathematically challenged can learn, so provided actual numbers for examples). - Goal of $X property portfolio (in today's value) all paid off in Y amount of years. ($2mil in 20 years) - Goal of $X passive rental income (assuming nothing owed on loans and after expenses) in the equivalent of today's value in Y years ($100,000 pa in 20 years) I'm aware many assumptions will need to be estimated/averaged out (inflation, growth etc). I'll admit its a bit out of my depth for now but hoping that the kind people of PC will take the time to explain it to this simpleton. Obviously strategy would be dependant on income and risk tolerance amongst other things, but just trying to get my head wrapped around the basics as from what I understand in this post APRA environment where credit isn't as easy to get, it is more important than ever to make every purchase count. Thanks in advance.