The land valuations available via the council rates notices or annual state government land tax calculation are not really much use, as they are based on land value only, and are also only updated on a multi-year cycle.
My method for getting a reasonable monthly figure is to use the bank mortgage statement for the outstanding loan balance at the end of each month, and a simple algorithm for estimating the current valuation of each property. The algorithm is based on the MEAN value of sales in the relevant postcode area (obtained each month from the "suburb snapshot" available by postcode area on the homepriceguide.com.au website for example,2086). I use a simple multiple of the mean price, based on the ratio that applied when I initially purchased the property. For example, my rental property cost 0.9156 x the mean price for the area, so each month I estimate the current valuation as 0.9156 x the latest mean price value.
This allows me to update both house prices and loan balances, and track my progress against what I expected for my property portfolio - paying off the loans over 20 years and property values increasing by approx. 6% per annum in the long run:


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