Ever wonder why a San Francisco or Marin investor would buy a property that barely cash flows on paper? The answer often lies in depreciation, and especially accelerated depreciation. Below I break down how smart Bay Area investors use these tools to turn a weak-looking deal into a tax-savvy win.
The short version
Depreciation lets real estate investors deduct a property's wear and tear over time. Cost segregation and bonus depreciation accelerate the write-off of short-lived assets. Qualifying as a Real Estate Professional lets these deductions offset active income, significantly reducing your taxable income.
Please note: I'm a real estate broker, not a CPA or attorney. This post is for informational purposes only and does not constitute tax or legal advice. Always consult your CPA or tax advisor for guidance specific to your situation.
Here's a quick cheat code before we dive deeper: depreciation usually has to be paid back when you sell, and it's called depreciation recapture. But there are smart ways to sidestep or defer it. I won't get into the weeds here, but if you're curious, just email me and I'll break it down for you.
At its core, the depreciation playbook comes down to three moves.
Write off a residential building over 27.5 years, reducing taxable income even while the property appreciates.
Reclassify short-life assets and take 100% bonus depreciation on them in year one under the new law.
Qualify under IRS rules and those deductions can offset active W-2 or 1099 income, not just rental income.
What depreciation is, and why it matters to investors
If you own rental property in San Francisco or Marin, depreciation is one of the most powerful tools in your tax toolbox. It lets you write off the wear and tear of a property over time, even while its value is climbing, as Bay Area real estate so often does.
For residential rental property, the IRS lets you depreciate the building over 27.5 years. So if you own a property with $850,000 of depreciable value (excluding land), you can deduct roughly $30,909 every year on paper.
Source: IRS Publication 946, How to Depreciate Property
Accelerated depreciation and cost segregation
Through a cost segregation study, you can break a property into components with shorter useful lives: appliances, flooring, fixtures, landscaping, and the like. These can be depreciated over 5, 7, or 15 years instead of 27.5.
Here's what changed, and it's big: under the One Big Beautiful Bill Act (OBBBA), 100% bonus depreciation is now permanent for qualifying short-life assets acquired and placed in service after January 19, 2025. Before OBBBA, bonus depreciation was scheduled to phase down to 40% in 2025 and 20% in 2026. Now you can write off the full value of those short-life assets in year one. (A transition election lets you opt for the old 40% rate in your first tax year ending after January 19, 2025, but 100% is the default.) This is what people mean by accelerated depreciation.
A quick example (for educational purposes only)
Imagine you buy a $1 million Bay Area rental. After subtracting land value, say you have $850,000 of depreciable basis. A cost segregation study might reclassify $250,000 of that into short-life assets.
Under today's 100% bonus depreciation, you could deduct the full $250,000 in year one. If you qualify as a Real Estate Professional, that $250,000 can offset your active income, even W-2 or 1099 income.
What that can mean at tax time
In that scenario, the strategy could reduce taxable income from $450,000 to roughly $200,000, potentially saving $85,000 to $92,000 in federal tax in a single year, depending on your bracket. Illustrative only: your numbers will differ.
Source: IRS Publication 925, Passive Activity and At-Risk Rules (REP / IRC §469(c)(7))
Real Estate Professional status is the key
To fully unlock these benefits, you (or your spouse) need to qualify as a Real Estate Professional under IRS rules. There are two tests, and you have to meet both.
Want the full breakdown of REP qualification rules?
Email me and I'll send it your way. In your message just write: REP Rules!
Source: IRS Topic No. 425, Passive Activities, Loss Limitations
But what about selling?
When you sell, the IRS recaptures the depreciation you took. This is called depreciation recapture, and it's taxed at up to 25% for real property and up to 37% for short-life assets (like those from a cost segregation study).
Many investors defer this hit with a 1031 exchange, which lets you roll all gains, including recapture, into another property and defer the tax entirely. If you're weighing a trade-up, my guide to triplex investing in San Francisco walks through how investors scale a portfolio here.
Some investors hold the final property until death. In that case, heirs receive a step-up in basis, and the capital gains and recapture taxes are wiped out.
Source: IRS, Estate Tax (Form 706, step-up in basis)
Residential building depreciation | Straight-line over 27.5 years |
|---|---|
Short-life assets (cost seg) | 5, 7, or 15 years |
Bonus depreciation, 2026 | 100% in year one (OBBBA, permanent) |
Recapture, real property | Taxed up to 25% |
Recapture, short-life assets | Taxed up to 37% |
Defer the tax | 1031 exchange, or hold to death for step-up |
Final thoughts
Depreciation, especially accelerated depreciation, can be a game-changer for high-income earners who invest in Bay Area real estate. But the rules are complex and change often. Talk to your CPA before making any decisions: what works for one investor may not work for another. (For related local costs, see my breakdowns of San Francisco property tax rates and who pays SF transfer tax.)
If you're thinking about buying an investment property in San Francisco or Marin and want to understand how the numbers might pencil out for you, I'm happy to share examples and insights.
Quick note: I'm not a CPA, but I'm deeply active in real estate. I help clients buy and sell homes every day, and I have a long personal track record investing in everything from commercial properties and condo conversions to remodels and foundation replacements.
Where I'd point you next
Thinking about an investment purchase in SF or Marin? Here are three good starting points.
Frequently asked questions
What is depreciation, and why does it matter?
How does cost segregation accelerate deductions?
Is bonus depreciation still 100% in 2026?
Who qualifies as a Real Estate Professional?
What happens when I sell a property I've depreciated?
Can depreciation reduce active income?
Let's map out your next investment
Want to see how the depreciation numbers might pencil out for a specific Bay Area property? Let's talk.
This article is general guidance only, not tax or legal advice. Depreciation, recapture, and bonus rules are complex and change often. Confirm details with your CPA or tax advisor before acting.
