Voodoo,
I have 7 IP's, the longest held one is 7 years as a rental, next longest is 2 years, the rest are between a few weeks and 2 years.
My experience is in relation to how much, is that rough as guts if you allow the same amount as your rates bill, this is not a bad amount to allocate on average.
Some IP's have been more than that, and some less, so it is not a bad average. Remember to allow some years will be lean and others fat with maintenance costs.
In terms of allowable claims, I dont know the ruling on this - have to check with ATO or others on this site might know. It would seem logical that from an audit point of view if you maintain excellent records and can demonstrate that any maintenance costs are directly related to the proper and adequate ongoing functionality of the property to maintain it as in reasonable condition then I cant see how limits would apply (unless it is an improvement.
ANy other ideas out there?
Cheers,
Tim