Key Takeaways
- A cost segregation study can identify missed depreciation and, via a Section 481(a) adjustment, significantly reduce income tax on a decedent’s final return.
- When timed before the final individual income tax filing deadline, these deductions often create a permanent tax benefit, because the property later receives a step‑up in basis at death.
- This strategy is most useful for clients with depreciable commercial or rental real estate, meaningful final‑year income and no plans to sell the property before death.
Why Cost Segregation Matters at End of Life
For many real estate investors, a cost segregation study is primarily viewed as a cash flow and tax savings tool that accelerates depreciation, reduces taxable income and improves liquidity during their lifetime. Yet for property owners approaching the end of their life, a cost segregation estate planning strategy can also play a powerful role in aligning income tax and wealth transfer goals.
When a client passes away, their real estate generally receives a step‑up in basis to fair market value for income tax purposes. This new basis resets depreciation for heirs and permanently eliminates any unrealized gain as of the date of death. What often gets overlooked, however, is that any unused depreciation deductions prior to that step‑up — including missed deductions identified in a cost segregation study — are lost forever if they aren’t claimed on the decedent’s final income tax return.
A well-timed cost segregation study, completed before the final individual income tax return is filed, can capture those missed deductions through a one‑time Section 481(a) accounting method adjustment. This accelerated depreciation can materially reduce or even eliminate income tax owed on the decedent’s final Form 1040, creating a permanent tax savings opportunity. Because the property receives a new stepped-up basis at death, there’s generally no depreciation recapture on these additional deductions, making this one of the rare moments in tax planning where accelerated depreciation produces a permanent benefit rather than a timing difference.
When a Cost Segregation Estate Strategy Makes Sense
This strategy tends to make the most sense when a client:
- Owns depreciable commercial property or rental property rather than a primary residence
- Isn’t planning to sell the real estate prior to death
- Has meaningful taxable income in their final year (for example, from business income, retirement account withdrawals or capital gains)
For wealth managers and tax advisors, the practical question is straightforward: does the client own depreciable real estate, and, if so, has anyone reviewed those assets for missed depreciation via a cost segregation study or other accounting method review? For high‑net‑worth families with larger real estate portfolios, integrating a cost segregation estate planning strategy into broader tax planning can help ensure no available deductions are left on the table in the year of death.
Deadlines and Filing Requirements
Timing remains critical. The cost segregation study must be completed and Form 3115, Application for Change in Accounting Method, must be filed with the final individual income tax return in order to claim a Section 481(a) adjustment. In many cases, the study may be performed after death as long as it’s completed, and Form 3115 is filed, by the due date (including extensions) of the final return. If that deadline passes, the opportunity is gone — missed depreciation can’t be claimed on an amended return for a decedent.
Integrating Cost Segregation Into Broader Estate Planning
For families with multiple rental properties or commercial buildings, a coordinated cost segregation strategy can reduce final‑year income tax, reset basis for the next generation at fair market value and establish a fresh depreciation schedule going forward. This approach can be especially valuable when paired with other estate planning and tax planning techniques designed to manage liquidity needs, fund bequests and support long-term wealth transfer goals.
If you’d like to learn more about the mechanics and broader benefits of a cost segregation study, see The Benefits of a Cost Segregation Study. For a broader perspective on how strategies like these fit into your overall tax planning strategy, explore Year-End Tax Planning for High-Net-Worth Families.
How Creative Planning Can Help
For clients where this strategy may apply, our team can quickly evaluate whether a cost segregation study is worthwhile and coordinate the work to ensure critical deadlines are met. To discuss how a cost segregation estate planning strategy might fit into your unique situation, connect with the Creative Planning Business Services team.
