Best Free and Cheap Short-Term Rental Cost Segregation Calculators (2026)

You are looking at a short-term rental property. Maybe you already own one and want to see if a cost segregation study makes sense. Maybe you are comparing five candidate homes across three markets and trying to figure out which one produces the biggest first-year tax deduction. Either way, you have opened Google and typed some version of "free cost segregation calculator" or "cheapest cost seg for Airbnb." This is the article for that search.

The short answer: there are three legitimate free calculators worth your time (Cost Seg EZ, Cost Segregation Guys, and FreeCostSeg), one $99 pre-purchase tool that produces a property-verifiable address-level analysis (DepreciMax), and one $299 Search Pack that drops the per-property cost to under $30 when you are actively comparing candidate homes. Everything under $100 is on this page. Beyond that you cross into paid engineered-study territory ($1,500+) which we cover in a separate article. Where useful, we back the write-ups here with a same-market head-to-head test we ran on a Joshua Tree, CA property — the FreeCostSeg section walks through exactly what that output contained.

What "free" and "cheap" actually mean in cost segregation

The word free in this space is doing a lot of work. Each of the three major free tools is the front door to a different paid product — the free ballpark is offered in exchange for contact info, and a rep follows up. That is a fair exchange for people who want a quick "is cost segregation worth exploring" number on a property they already own. It is a poor fit for people trying to screen candidate properties before buying, because the vendor's incentive structure is oriented around closing the paid study on the one property you submitted, not helping you compare five properties across three markets.

The three free tools also work differently under the hood. Cost Seg EZ and Cost Segregation Guys are input-based — you supply property basics (price, square footage, year built, sometimes an amenity checklist) and the tool applies property-type average reclassification percentages to those inputs. FreeCostSeg is address-based and, per its site, uses an AI-driven data pull from broker listings, property photos, assessor records, and satellite imagery to estimate the depreciable basis before applying its benchmark study percentages. We ran a live test on a Joshua Tree property to see what each output actually contained — that walk-through is in the FreeCostSeg section below.

DepreciMax sits in the "cheap but not free" tier at $99 per property report or $299 for a 10-report Search Pack. The $99 report is address-based like FreeCostSeg but the output is shaped differently: the listing photos the AI analyzed are displayed inside the report itself, land value is pulled from county assessor records and benchmarked against that market's low/median/high, an itemized bonus depreciation line-item breakdown maps each finding to an IRS category, and the property is scored against every short-term rental DepreciMax has analyzed across 197 US markets. The Search Pack drops the per-property cost to $29.90 — below the effective cost of any other real-money tool in the category.

Comparison table — free tools vs. DepreciMax

All of these tools produce planning-grade numbers, not engineered studies. None of them replaces the engineered cost segregation study your CPA files from. Where they differ is what the number is built from, and whether the property-specific findings behind the number are visible in the output.

The three free calculators, honest reviews

1. Cost Seg EZ — Free Estimate (costsegez.com)

What it is. The free-calculator front end for a paid DIY cost segregation study product oriented toward simple residential rentals (Cost Seg EZ operates as a sister brand to MVO, a broader tax specialty firm). The free web calculator walks you through a ~2-minute flow asking for property basics: purchase price, year built, general property type, an estimated land value, and square footage. After you submit (form requires contact info), you get an estimated first-year savings figure plus a follow-up path to the paid product.

How it produces the number. Input-based. The calculator applies property-type average reclassification percentages to the inputs you supplied. It does not pull external data about your specific property. If you submit "$500,000 purchase price, 20% land, 2015 build, single-family, Airbnb," the tool applies a bonus-eligible percentage typical of that shape of property. Two different Pigeon Forge cabins at the same purchase price get the same estimated write-off — even if one has a private hot tub deck, upgraded finishes, and a game room, and the other is a bare-bones flip. The calculator has no way to see either.

Where it fits. An owner of one straightforward residential property who wants a rough number to decide whether to move forward with a paid DIY study. Not workable for buyers screening multiple candidate homes: the input-based shape means candidate-vs-candidate comparisons largely collapse to whichever property you assign the higher land ratio to.

2. Cost Segregation Guys — Free Proposal (costsegregationguys.com)

What it is. The free-proposal front end for a full-service engineered cost segregation study firm. Cost Segregation Guys' paid engineered studies typically run $5,000–$25,000 depending on property complexity, size, and class. The free intake takes ~5 minutes: address, purchase price, property type, square footage, year built, some amenity checkboxes, plus your name/email/phone. A rep reviews the submission and emails back within about 5 hours with an estimated first-year savings figure and a flat quote for the paid engineered study.

How "human review" actually works. The rep is reviewing your submission — not your listing photos, not county assessor records, not the actual property. Human review catches obvious data-entry misclassifications (you accidentally checked "commercial" when you meant "single-family residential", or you left out a detached casita's square footage). It does not verify whether the amenities you claim actually exist. If your amenity checklist says "hot tub, pool, outdoor kitchen," the rep takes your word for it and applies the corresponding property-type-average bonus-eligible bump. The underlying free-proposal math is still input-based; the human review is quality control on your inputs, not property-level analysis. Their paid engineered study on the other side of the funnel is a different product entirely.

Where it fits. The free proposal is useful as a rep-reviewed ballpark for an owner deciding whether to commission the paid engineered study, particularly for out-of-state rentals where the fully-virtual intake helps. The paid engineered study on the other end is the appropriate tool once you own the property and are filing the deduction. As a screening tool for a buyer running 5 candidate homes on an offer deadline, neither the free proposal (5-hour turnaround per property) nor the paid study ($5k–$25k) scales.

3. FreeCostSeg — Free Calculator (freecostseg.com)

What it is. The most ambitious of the three free tools — genuinely address-based rather than input-based. FreeCostSeg's free web calculator asks for the property address, and per its site an AI-driven data-pull layer sources from broker listings, property photos, assessor records, and satellite imagery to estimate the depreciable basis. Editable assumptions are exposed for purchase price and land value. The free calculator is the front door to Modern CFO's paid $1,800 flat-rate single-family engineered study, which is the current price leader in engineer-signed short-term rental studies. FreeCostSeg's own attribution line notes that its reclassification percentages come from a versioned 45-property-type benchmark dataset and that "results are planning estimates, not an engineering study."

What we observed on a same-market test. We ran a Joshua Tree, CA short-term rental address through the free calculator and captured the result screen. What was visible in the output:

• A banner at the top of the output stating the depreciable basis "is currently estimated by AI" and requesting that we update the purchase price and/or land value if we had better numbers. Optional manual fields were provided for both.
• An asset-class breakdown of exactly four buckets at 24.0% / 0.0% / 10.0% / 66.0% with generic labels — the 66.0% row was labeled "Commercial building structure." $0 allocated to 7-year property, which is notable for what would presumably be a furnished short-term rental.
• Headline outputs: $275,182 Year-1 savings and a "110.1x return on study" figure, both computed against the AI-estimated basis.
• An info box on the same screen stating that the reclassification percentages shown are "the same benchmark study percentages used across 1,000+ studies" — i.e., the four-bucket allocation is the property-type-benchmark output, not a property-specific finding.

How to read this carefully. The tool is genuinely address-based, and FreeCostSeg's own materials describe an AI data-pull layer that predates the calculator output. What we can say is what we observed: in our test, the property-specific findings (which amenities the AI identified in the listing photos, what parcel land split the assessor pull returned, how the property compares to other Joshua Tree short-term rentals) were not surfaced anywhere in the output we saw. The output showed benchmark percentages applied to an AI-estimated basis, with the tool asking us to supply the numbers that matter most (purchase price and land value). Whether property-level analysis happens behind the interface is not something we can verify from the result screen alone.

What we are not saying. We are not asserting that FreeCostSeg's data pulls are fake, and we are not criticizing the 39-year recovery period in the "Commercial building structure" bucket — 39-year is the correct recovery period for transient-use short-term rentals under IRC §168, and we assume that's the deliberate classification. We are reporting only what was visible in the output.

Where it fits. A rough address-based ballpark for an owner of one property who wants a same-vendor path to the paid $1,800 flat-rate SFR study. As a screening tool for a buyer comparing candidate properties, it inherits the same single-property, one-session shape as the other two free calculators.

The under-$100 tool that gives you a specific-address analysis — DepreciMax

DepreciMax is address-based like FreeCostSeg but the output is shaped differently. Instead of one Year-1 headline number and a benchmark-percentage breakdown, the $99 Property Report shows the property-specific findings the analysis was built from and displays the classification math on top of them:

• The analyzed listing photos, displayed in the report. The photos the AI reviewed to identify amenities and finishes appear inside the report and inside the PDF export, alongside the itemized findings drawn from them (hot tub, upgraded flooring, decorative lighting, outdoor kitchen build-out, etc.). If it's in the photos, it counts; if it isn't, it doesn't.
• Itemized bonus depreciation line-item breakdown, mapped to IRS categories. Each identified component is classified to 5-year personal property, 15-year land improvements, or 39-year structural per IRC §168 — not a rolled-up four-bucket allocation, but component-level line items.
• Actual land value as % of purchase price, benchmarked against the specific market. Assessor land value for the parcel is shown, computed as a % of purchase price, with the market's low / median / high band alongside so you can see where this specific parcel sits. On a $500,000 property, land-ratio variance from an assumed 20% to an actual 15% or 30% swings tens of thousands of dollars in Year-1 write-off — $50k+ in high-land coastal markets, $10k–$20k on typical lake or mountain properties.
• National tier ranking across all 197 US short-term rental markets DepreciMax has analyzed. The property's bonus-eligible percentage is expressed as a tier score against every short-term rental the platform has ever run — useful when comparing candidate properties across markets.
• State conformity personalization across all 51 US jurisdictions. Full/partial/decoupled add-back math computed for your specific state, with the state-return timing adjustment quantified — a real consideration in decoupled states like California or Iowa.
• Deal personalization: down payment, marginal tax bracket, and Year-1 cash tax savings as % of down payment. The screening decision numbers — not "how much can I deduct?" but "how much of my down payment does this deduction fund?"
• Analyst notes, calibrated against formal cost segregation studies. Short property-specific observations from the classification step, with the caveat that DepreciMax is calibrated to formal studies but is not itself a filing-grade deliverable.

For house-hunters actively comparing candidate properties, the $299 Search Pack is the better value: 10 individual Property Reports drawn from your balance as you go, at $29.90 per property analyzed. That is the lowest per-report price of any specific-address tool in the cost segregation category, and is designed exactly for the "I'm looking at 5 candidate homes across 3 markets" workflow the free calculators structurally do not handle.

When free is enough — and when it isn't

Free is enough when: you own one short-term rental you're not planning to sell, you want a quick "is this worth exploring" number, and you're prepared to submit contact info in exchange for the ballpark. Any of the three free tools will do. Cost Seg EZ is fastest. Cost Segregation Guys' rep-reviewed proposal catches obvious data-entry mistakes. FreeCostSeg's address-based front end saves you looking up basic inputs. All three lead to paid products — that's the fair trade.

Free is not enough when: you are still choosing which property to buy. Free calculators are structurally designed around the property you already have, not the properties you're evaluating. Cost Seg EZ and Cost Segregation Guys apply industry-average percentages to inputs you supply; FreeCostSeg estimates a basis and applies 45-property-type benchmarks. Neither surfaces the property-specific findings a buyer needs to compare five candidate homes on an offer deadline — the parcel's actual land split, the amenities the AI actually saw in the listing photos, the specific market benchmarks. That's the gap the $99 DepreciMax Report and $299 Search Pack are built for.

An evaluation standard for any cost seg tool

If you take one thing from this article, take this: when evaluating any cost segregation tool, free or paid, ask to see two things — the land split, and the property-specific findings. If the tool can show you the parcel's assessed land value and the specific components it classified into 5-year, 15-year, and 39-year buckets, then you're looking at something that meaningfully differentiates your property from the average. If the tool can only show you a Year-1 headline and a benchmark-percentage breakdown, you're looking at a directional planning estimate — useful for one job, not for another.

That evaluation standard applies to DepreciMax too. When you run a $99 report, look for the analyzed listing photos, the assessor land split, and the itemized IRS-category breakdown. Those are the outputs a property-specific tool owes you.

After you close — when to step up to a paid study

Once you own the property, you file the deduction using a properly-documented cost segregation study. The cheapest engineer-signed studies for short-term rentals start around $1,500–$1,800 (FreeCostSeg's flat-rate single-family product is the current price leader). Cost Seg Smart offers self-serve software-only studies from $495–$2,500 if your CPA is comfortable with a non-engineer-signed deliverable. Cost Segregation Guys' engineered studies start around $5,000. Traditional firms like KBKG and CSSI serve higher-complexity properties starting around $3,000.

The full comparison of paid studies — from the cheapest $495 self-serve tools up to $15,000+ engineering-firm engagements — is covered in our complete cost segregation software guide for short-term rentals. That article picks up where this one ends.

Frequently asked questions