Cost Segregation for Properties You Already Own: The Look-Back Study
You Do Not Have to Start at Year One
One of the most common misconceptions about cost segregation is that you have to do it when you buy the property. While the year of purchase is the optimal time, the IRS allows property owners to conduct a cost segregation study at any point during ownership and claim all the missed accelerated depreciation retroactively.
This is done through what is called a look-back study, and it uses IRS Form 3115 to change the property's depreciation method. The result is a one-time catch-up deduction in the current tax year that captures all the accelerated depreciation you would have claimed if you had done the study from the beginning.
How the Look-Back Study Works
When you conduct a look-back cost segregation study, the engineering analysis is the same as a standard study. Stratum's team identifies and reclassifies building components into 5-year, 7-year, and 15-year categories based on their physical characteristics and IRS classification rules.
The difference is in how the deduction is calculated. Instead of claiming bonus depreciation on the reclassified assets (since the bonus depreciation window has passed for assets placed in service in prior years), the study calculates the difference between what you actually claimed under straight-line depreciation and what you would have claimed under the accelerated schedule. That entire difference is claimed as a Section 481(a) adjustment on your current-year tax return via Form 3115.
For example, if you purchased a property seven years ago and the cost segregation study determines you should have claimed an additional $90,000 in depreciation over those seven years, that $90,000 is deducted in full on your current return. No amended returns. No limitation on the amount. One deduction, one year.
Who Benefits Most from a Look-Back Study
Look-back studies are especially valuable for investors who purchased properties before they were aware of cost segregation, investors who were previously in lower tax brackets but now earn enough to benefit from larger deductions, owners of properties with high depreciable bases that have been under-depreciated for years, and investors who want to generate a large deduction in a specific tax year to offset a high-income event.
There is no time limit on when you can conduct a look-back study. Whether you bought the property two years ago or twenty years ago, the strategy works the same way.
The Look-Back Advantage Over New Studies
In some ways, look-back studies actually deliver a better outcome than studies done at the time of purchase. The catch-up deduction is not subject to the bonus depreciation phase-down because it represents accumulated depreciation rather than first-year bonus depreciation. This means the full reclassified depreciation is available regardless of the current bonus depreciation rate.
Additionally, the Section 481(a) adjustment creates a large, concentrated deduction in a single year. For investors who want to offset a specific high-income year, such as a year with a large capital gain, bonus, or business sale, a look-back study provides precise control over the timing of the deduction.
Get Your Look-Back Study Started
If you own a rental property that has been depreciating under straight-line for any number of years, you are almost certainly leaving money on the table. A look-back cost segregation study from Stratum can recover all that missed depreciation in a single deduction. Start with a free estimate to see how much your property could yield.