Residual Studies

Residual Cost Segregation Estimation Approach:

The residual cost segregation estimation approach is an abbreviated method in which only short-lived asset costs (e.g., 5- or 7-year property) are determined. Short-lived asset costs are  added together and then subtracted from the total project cost.  The remaining or “residual” cost is then simply assigned to the building and/or other long-lived assets.  Although this method is simpler and less time consuming than the engineering approaches, it can also be less accurate.

It should be recognized that this method generally does not reconcile project costs.  In general, residual costs are not estimated or checked for reasonableness.  A proper and “reasonable” residual cost should always be determined and then added back to the total of all short-lived asset costs to check if the total project cost is reconciled.

It should also be understood that different estimation techniques for short-lived assets can produce a skewed result in favor of § 1245 property (e.g., § 1245 property based on single-unit costs for high quality construction, while the building is based on gross square footage). 1


1 Internal Revenue Service, Cost Segregation Audit Techniques Guide, Chapter 3 Cost Segregation Methodologies (accessed January 2, 2008); available from http://www.irs.gov/businesses/article/0,,id=135052,00.html#8.