Cost segregation: how it can save you a lot of taxes | White coat investor

Real estate is a popular path to financial independence for high-income professionals. And it’s no surprise why: rental properties offer cash flow, appreciation and powerful tax benefits. But here’s the problem: Many doctors miss the full potential of those tax benefits because their CPA never told them about one key strategy.

It’s called cost separation.

If you own investment properties, especially commercial or short-term rentals, understanding cost segregation can help you unlock tens of thousands (or even hundreds of thousands) of dollars in early tax deductions.

And depending on how your income is structured, this can dramatically reduce what you owe to the IRS. But the benefits will only come if the strategy is implemented correctly and paired with a proactive tax plan.

What is cost segregation?

Cost segregation is a tax strategy that accelerates depreciation. Instead of deducting your property evenly over 27.5 or 39 years, as you normally would with a short-term rental and a commercial building, respectively, you break it down into parts that depreciate more quickly: things like flooring, cabinets, appliances, landscaping and lighting.

These components are considered “personal property” or “land improvements” and are eligible for depreciation schedules of five, seven, or 15 years, rather than the 27.5 or 39 year schedule for the building itself. A cost segregation study reclassifies these components so you can deduct them much sooner – and in many cases all at once through bonus depreciation.

Depending on the property type and size, surveys typically range from $1,200 – $5,000. At the lower end, investors can get a quick technical survey that uses virtual location verification and streamlined reporting to deliver tax savings at a lower cost, while a fully detailed survey includes a personal site visit and more extensive documentation, ideal for larger or more complex properties.

That means you can take a huge deduction in year 1, rather than slowly spreading it out over decades.

Here’s an example:

• A doctor purchases a $1 million short-term rental
• Without cost segregation, they get ~$25,000 per year in depreciation
• Cost segregation allows them to prepay $400,000+ in year 1 deductions

Same ownership. Same purchase price. Drastically different tax result. That $400,000 deduction can offset your clinical income, capital gains or other income if you meet the requirements.

More information here:

10 Tax Benefits of Real Estate – How Many Can You Name?

Real Estate Losses at Ordinary Income

Why it’s important for high-income earners

For most W-2 physicians, real estate losses are considered “passive,” meaning they cannot offset their W-2 income. This is due to the IRS’s passive activity loss rules under Section 469.

But there are important exceptions that allow you to treat real estate losses as an asset:

#1 Short-term rental (STR) loophole

If your average rental duration is seven days or less and you participate substantially in the management of the property, this is not considered a rental activity under IRS rules – and therefore your short-term rental is not subject to passive loss restrictions. That means you can use the losses (including the depreciation of the bonus through cost segregation) to offset your active income, even if you don’t qualify as a real estate professional.

For busy physicians, this is one of the most accessible ways to realize tax savings.

#2 Professional Status in Real Estate (REPS)

To qualify for REPS you must:

• Spending more than 750 hours per year on real estate activities, and
• Put in more hours in real estate than in your doctor job

This is difficult for full-time physicians, but it is often feasible for a spouse who actively manages real estate. REPS allows you to treat all rental income and losses as non-passive, meaning the large depreciation deductions resulting from cost segregation can offset your clinical salary.

A case study: 2 doctors, 2 results

Let’s say Dr. A and Dr. B each purchased a $1.2 million short-term rental in early 2025. Both properties have a depreciable basis of $1 million after $200,000 of land is allocated (land cannot be depreciated).

• Dr. A works full time, hires a management company and treats the property as passive. They depreciate it over 39 years using the straight-line method.
• Dr. B keeps the average guest stay under seven days, manages the property itself to meet material participation standards, and commissions a cost segregation study.

This is the difference:

• Dr. A gets ~$25,600 of straight-line depreciation for 2025 (39 year schedule).
• Dr. B receives a cost segregation report identifying $400,000 in five- and fifteen-year components (eligible for 100% bonus depreciation in 2025). The full $400,000 is immediately deducted in year 1.

If Dr. B is in the 37% tax bracket, that means ~$148,000 in federal tax savings in the first year alone. The remaining depreciation will continue to offset revenues in future years.

Same purchase price. Same market. The only difference? Strategic planning and a cost segregation study.

What most CPAs do wrong

Many high-income clients come to me after their CPA told them that cost segregation wouldn’t help. In reality, the CPA wasn’t wrong, but they didn’t go far enough. Cost segregation only helps if you can utilize the losses.

That’s why proactive planning is important. Before closing on a home, ask yourself:

• Can I (or my spouse) qualify for REPS?
• Can we meet the material participation tests for a short-term rental?
• Will these losses reduce our taxable income this year or simply be carried forward?

Too many investors discover the strategy after it is too late to qualify for the major exceptions. But with the right setup, cost segregation can eliminate your entire tax bill for the year.

More information here:

How the IRS Treats You as a Real Estate Investor

How we became accidental landlords: turning a main home into a rental property

Other considerations for physicians

Here you can read what you should take into account if you are a high earner and are considering conducting a cost segregation study.

1. Alternative Minimum Tax (AMT): Cost segregation deductions are generally not an AMT preference item, meaning you will still benefit from them even if you are subject to AMT.
2. Phase-out rules: High income earners often eliminate many tax deductions, but write-offs are not limited. That makes cost segregation one of the few levers doctors have left to earn more than $500,000.
3. Entity structure: Whether you own the property personally, in an LLC, or in an S Corp can affect how losses are treated. Make sure your tax professional understands real estate and high-income clients.
4. Phasing out bonus depreciation: Bonus depreciation was intended to be phased out in 2025 and 2026, but the One Big Beautiful Bill Act reversed that. Bonus depreciation can significantly accelerate deductions.

Final thoughts

Too many physicians invest in real estate hoping for tax savings, but ultimately leave money on the table.

Cost segregation is not suitable for everyone. (e.g. a low income earner, a non-investor (since primary residences don’t work), if your depreciation basis is too low, if you can’t access the losses through one of the loopholes). But if you own high-value real estate or you qualify for one of the major exceptions, this could be a game-changer.

Don’t assume your CPA has researched this. To ask. Plan. And if you’re considering a property purchase this year, make sure you understand how depreciation fits into your overall tax strategy.

Because if done right, this one move can be worth six figures, and it can build wealth faster than almost anything else in real estate.

Have you used cost separation? Did it work for you? How much have you saved in taxes?