Ed Neuhaus 
The R.E. Cost Seg free calculator can show you a realistic first-year tax savings estimate on a rental property in about 90 seconds, no email, no sales call, no commitment. For a typical $500,000 single-family rental in Austin, the calculator usually surfaces somewhere between $25,000 and $60,000 in accelerated first-year depreciation depending on land allocation and how aggressive the components shake out. Sounds like a lot right. But here is the thing, the number is real, and you can stress-test it yourself before you ever spend a dollar on a full study.
I have been investing in Texas rentals alongside my real estate practice for 19 years now, and cost segregation is one of those tools that sounds way more complicated than it actually is. Lets walk through how to use the calculator, what the numbers mean, and what to do with the answer. (Affiliate disclosure: Neuhaus Realty Group may earn a commission if you proceed with a study through R.E. Cost Seg, at no additional cost to you. I only point clients to tools I actually use myself.)
What this calculator actually does
A full engineering-based cost segregation study runs $5,000 to $15,000 depending on property size and complexity. That is real money, and the worst feeling in the world is paying for a study only to find out the tax benefit was smaller than what you owed the engineer. The free calculator from R.E. Cost Seg exists so you can do a quick gut-check before you commit. Plug in a few details, get an estimated breakdown of how the building gets reclassified into 5-year, 7-year, 15-year, and 27.5/39-year buckets, and see what your accelerated depreciation looks like.
It is not a substitute for the real study. Think of it like Zillow’s Zestimate vs an actual appraisal, close enough to tell you if the conversation is worth having, not close enough to file taxes on.
Try it right now
Go ahead and run a property through it before you keep reading. Watching the numbers move while you change inputs is way more useful than me describing it.
What to enter, field by field
Property type. Pick the closest match. Single-family rental, multifamily, short-term rental, commercial, whatever fits. The category matters because it changes the assumed component breakdown. A short-term rental on Lake Travis with a pool, hot tub, and outdoor kitchen will hit a different bonus depreciation profile than a long-term Lakeway four-bedroom with a basic backyard.
Purchase price. Use what you actually paid (or are about to pay), not the appraised value. Cost basis for depreciation comes from your purchase price plus closing costs that were capitalized, minus the land value.
Land value. This is the field most people get wrong. The IRS makes you exclude land from depreciation (land does not wear out, in their view), and what you put here directly changes your depreciable basis. The default move is to pull land value from the county appraisal district. In Austin that is Travis CAD. Travis usually splits land at 20-30% of total value for a typical residential lot, sometimes higher in the Westlake bubble or close to downtown. If you do not know, leave it at the calculator default and refine later.
Year placed in service. The year you started renting it. Critical for the calculator because bonus depreciation rules have shifted year by year. The good news, the One Big Beautiful Bill Act restored 100% bonus depreciation for property acquired and placed in service after January 19, 2025, so anyone buying now is back in the full-bonus zone.
Renovation costs (if applicable). If you put a new roof, new HVAC, or did a kitchen remodel after placing the property in service, those go in here separately. They have their own depreciation profile and often get lumped into shorter-life buckets.
What the output is telling you
The calculator spits back something like “estimated first-year deduction: $42,500.” Ok cool. But there are three numbers under the hood you actually want to look at.
The 5-year bucket. This is appliances, carpet, decorative lighting, removable cabinetry, window treatments. About 5-15% of total cost on most residential properties. With 100% bonus depreciation back, the entire 5-year amount can hit your return in year one.
The 15-year bucket. Land improvements. Driveways, landscaping, fencing, exterior lighting, pool decking, retaining walls. Usually 5-10% of total cost, but on a Hill Country property with a pool and serious landscaping it can climb to 15%+. Also eligible for bonus depreciation.
The 27.5-year (or 39-year for commercial) remainder. Whatever does not get reclassified stays on the slow boat. The structural shell, roof, foundation, the bulk of the building. Still depreciates, just at the boring straight-line pace.
Add up the front-loaded portion (5-year + 15-year + any 7-year items, all eligible for bonus), multiply by your marginal tax rate, and that is your actual cash savings. Not the deduction, the savings. A $50,000 deduction in the 32% bracket is a $16,000 tax bill reduction. The calculator usually does this math for you.
The honest limits of the free tool
I love this calculator but I want to be straight about what it is not. It uses industry-standard ratios for component breakdowns, not an actual engineer walking your property. So if your property is unusual (heavy custom build-out, lots of specialty equipment, atypical land improvements), the estimate could be 20-30% off in either direction. A real engineering study finds value the calculator cannot see.
It also cannot model your personal tax situation. Whether the loss is deductible against your active income depends on whether you qualify as a real estate professional or whether your income is under the $100k-$150k passive loss phase-out. For most W-2 buyers, passive losses get suspended and carry forward. That is fine, you still use them eventually, but it changes the timing of the benefit. Talk to a CPA who actually does real estate before you bake this into your buy decision.
When the calculator says “do the study”
Rough rule of thumb that has held up for me, if the calculator estimates first-year accelerated deductions north of $30,000 and you have the income to absorb the loss, the study almost always pencils out. At a 32% marginal rate, $30,000 in accelerated deduction is $9,600 in cash savings against a $5,000 study cost. Not bad.
If the estimate comes in under $20,000 of accelerated deduction, the math gets tighter. Smaller properties, properties with mostly slow-bucket components (think basic suburban tract homes with no pool, no land improvements, minimal appliances), sometimes do not have enough non-structural value to make the study worth it. The calculator catches this for you before you write a check.
Anything in the middle is where you actually need to think. Run the numbers with your CPA, factor in whether you can use the losses now or have to carry them forward, and decide. (As Benjamin Graham used to say, the margin of safety is everything. Same applies here. If the math is borderline, skip it.)
The Austin-specific angle
I see a lot of out-of-state buyers picking up Austin investment properties right now, and cost seg is one of the fastest ways to make the deal pencil. Austin land values are high, which hurts (less depreciable basis), but build quality and amenity loads tend to be high too, which helps (more 5-year and 15-year stuff to reclassify). Pools are common out here. Outdoor kitchens, hot tubs, fancy landscaping, all 15-year. A typical Austin investment property with a pool and decent landscaping will pull a meaningfully better cost seg result than the same property in a market without those features.
Short-term rentals in particular get supercharged. The component density (furniture, electronics, appliances, decor, outdoor amenities) is higher, and if you materially participate in the STR you may avoid the passive loss trap entirely. If that is your play, the calculator will under-estimate, run a real study.
What to do after you run it
If the number looks promising, the next step is to request a free proposal from R.E. Cost Seg. They will look at your specific property, give you a fixed quote and a more refined savings estimate, and you can decide from there. There is no pressure on the proposal step, you are not committing to the study yet.
If you are still shopping for the property and trying to figure out whether cost seg makes the deal work, that is exactly the conversation I have with investor clients all the time. We can run the calculator together on a specific listing, talk about the income side, and figure out if it actually pencils. (Read my full cost segregation guide if you want the deeper dive on how the studies work and which scenarios benefit most.)
For everything else investing-related (cap rates, BRRRR, 1031 exchanges, financing), I have been building out a full investing resource hub that covers the rest of the toolkit. Cost seg is one piece, the rest of the math matters too.
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The bottom line
Spending 90 seconds on a free calculator before spending $10,000 on an engineering study is just good math. Run your property through R.E. Cost Seg first, see what the number looks like, and then decide whether the full study is worth it. If you are buying or already own an investment property in Austin and want to talk through how cost seg fits into the overall deal, reach out to me directly. Lets grab coffee and run some numbers.
Be safe, be good, and be nice to people.
