The Look-Back
Integrating a cost segregation study with the IRS provision for retrieving unclaimed depreciation from years, without the necessity to amend previous tax filings, can result in substantial financial gains. A look-back strategy can be advantageous, reaching back as far as 8 to 10 years.
Assume an investor purchases a single family property as an rental investment for $150,000 in 2022. According to the local property assessor, the market land value for the property is $21,000 leaving a residual value of $154,000 for improvements
Acquisition Cost
$ 175,000
Land Market Value
$ 21,000
Buildings and Structures
$ 154,000
Annual Deprecation
$ 5,600

The traditional method of capitalizing this acquisition would be to subtract the market value of the land from the acquisition cost and capitalize the residual $154,000 at $5,600 per year for 27.5 yers.
A cost segregation analysis was carried out using information provided by the property owner, which identified non-realty short-lived items and land improvements that, by definition, are not considered real estate. The results determined the property included:
Property Component
Allocation %
Alllocation $
Dep. Method
Current Tax Year
Personal Property
18.4%
$ 32,340
5 Year, 200% DDB
$ 10,866
Land Improvements
11.4%​
Buildings and Structures
70.2%
$ 20,020
15 Year 150% DDB
$ 2,645
$ 100,100
27.5 Year SL
$ 7,280
$ 20,792
Current Year Depreciation Deduction
Depreciation Claimed in First Year
$ 5,600
Net Depreciation Gain
$ 15,192
Implementing the cost segregation study accelerates the depreciation of the personal property assets to a five-year, double-declining balance depreciation model and plan improvements for a 15-year double-declining balance method, greatly increasing the allowable deduction.
Additionally, since this is a look-back study, depreciation not taken in the first year is rolled into the current tax year allowing for deduction of depreciation not taken in prior years.