By BMTQS | www.bmtqs.com.au | Submitted May 2009 From the date of construction completion, the ATO has determined that any building eligible to claim the building write-off allowance has a maximum effective life of 40 years. Therefore, investors can generally claim up to 40 years depreciation on a brand new building, whereas the balance of the 40 year period from construction completion is claimable on an older property.