How Do You Unlock Missed Tax Savings? Leverage a Look-Back Cost Seg Study Using Form 3115!

If you’ve owned an investment property for a few years and did not do a cost segregation study, no problem.

Many real estate investors miss out on significant tax savings. How? Simply because they didn’t perform a cost segregation study when they first placed a property in service.

The good news? It’s not too late to go back and capture that lost depreciation. You can use a “look-back” cost segregation study, then leverage the IRS Form 3115.

This applies whether you own a multifamily property, a flex or industrial asset, a retail building/strip center, a hotel/resort hospitality property, or even a Short Term Rental using the STR Loophole. The property type is indifferent. So long as you own an income producing real property asset, a look back study can be performed.

What exactly is a Look-Back Cost Segregation Study?

A look-back cost segregation study is performed on a property that was acquired or constructed in a prior tax year, where the straight-line method (27.5 or 39 years) was used. This study will reclassify building components into shorter recovery periods (of 5, 7, or 15 years). This captures your depreciation deductions missed in previous years.

How Form 3115 Comes Into Play

NO NEED TO AMEND PRIOR TAX RETURNS. Using Form 3115, investors can claim missed depreciation (opportunity cost) without amending prior tax returns. Form 3115, Change in Accounting Method allows investors to “catch up” on previously unclaimed short life depreciation. Then you can take it in the current tax year using a Section 481(a) adjustment.

In practical terms, this means:

You calculate the total additional depreciation you could have taken in prior years.
This deduction is taken in the current year, thus creating a large tax benefit.

Why This Matters

A look-back study paired with Form 3115 offers several advantages:

No need to amend prior returns > saving time and complexity
Immediate tax benefit > a potentially large tax deduction in the current year
Improved cash flow > reduced tax liability frees up capital to invest
Audit support > when performed properly, the study provides defensible documentation

Ideal Candidates

This strategy is valuable for properties placed in service in prior tax year, where a cost segregation study was not completed
The “look back” can apply to acquired properties within the past 10+ years, depending on the property basis
The bigger the basis, the further we can go back to capture missed depreciation
Taxpayers looking to offset current high-income year

A missed cost segregation opportunity isn’t gone forever. By utilizing a look-back study, then filing a Form 3115, real estate owners can reclaim lost depreciation and improve tax efficiency. It’s one of the most powerful, and underutilized, tools in the tax code for investment property owners.

If you own commercial or residential investment property and haven’t explored this strategy, now may be the perfect time to revisit your depreciation schedule and unlock hidden tax deductions.