Cost Segregation Under $200K: When the Math Pencils (and When It Doesn't)

Cost segregation under $200,000 is a math problem, not a tax-strategy debate. The accelerated depreciation works exactly the same way at $150K as it does at $1.5M — what changes is whether the study fee eats too much of the Year-1 benefit to justify ordering. This guide is the honest break-even math: when sub-$200K cost seg pays, when it doesn’t, and the three scenarios that meaningfully tilt the equation in favor.

If your property is over $200K, see our companion guides — cost segregation under $500K, $500K–$1M, or $1M–$2M. Everything below assumes purchase price under $200,000.

The 30-second answer

For most sub-$200K rentals, cost segregation works — but the margin is narrow. At the representative 16% reclassification we publish for a single-family rental (inside the 9–32% band), a $150K rental (depreciable basis $120K after a 20% land carve) produces an illustrative Year-1 accelerated deduction of ~$19,200. At a 32% federal bracket, that’s $6,144 in current-year federal tax savings. A Cost Seg Smart automated study at the $495 price tier returns about 12× its fee. A $3,000 traditional firm engagement on the same property returns about 2× — borderline economics. Two scenarios shift the math meaningfully: Form 3115 lookback for properties owned 2+ years (multi-year catch-up adjustment) and short-term rentals (typically 19–39%, most often around 26%, from heavier FF&E loads).

The math: when under-$200K cost seg pays

A worked example at illustrative rates inside the published bands, current pricing, and 100% bonus depreciation (permanent post-OBBBA):

Line item	$150K SFR	$150K STR (furnished)
Purchase price	$150,000	$150,000
Land allocation (20%)	$30,000	$30,000
Depreciable basis	$120,000	$120,000
Illustrative reclassification % (representative rate)	16% (SFR band 9–32%)	26% (STR band 19–39%)
Reclassified basis	$19,200	$31,200
Year-1 deduction (100% bonus)	$19,200	$31,200
Federal tax savings at 24%	$4,608	$7,488
Federal tax savings at 32%	$6,144	$9,984
Federal tax savings at 37%	$7,104	$11,544
Cost Seg Smart study cost	$495	$495
Net Year-1 benefit at 32%	$5,649	$9,489
Return on the study fee at 32%	12×	20×

State tax savings add 3–13% on top in conforming states. In non-conforming states (CA, NY, NJ, PA, NC, others), the federal benefit still applies — the state schedule recomputes without bonus depreciation. See our bonus depreciation by state guide for the conformity map.

A $150K rental held 30 years on the default 27.5-year straight-line schedule yields ~$4,360/year in depreciation. In this illustrative example, cost segregation moves about 4 years of “default depreciation” into Year 1 — useful if you have current-year tax liability, less useful if you don’t.

When it definitely doesn’t pay

Three scenarios where cost segregation under $200K is the wrong call:

1. You have no current-year tax liability. Cost segregation accelerates the timing of deductions, not their total amount. If you’re in a low-income year, a retirement bridge year, or carrying business losses, the Year-1 deduction has no current-year tax to offset. The deductions get suspended under §469 passive-activity rules and only release when you have offsetting passive income or sell the property. Wait until you have income to use them against.

2. You’re selling within 2 years. Depreciation recapture under §1250 (residential) and §1245 (personal property) kicks in on disposition. The 5-year and 7-year personal property classes recapture at ordinary income rates, not the 25% §1250 cap. On a quick flip, the recapture math can wash the timing benefit. For holds of 5+ years the math nearly always favors cost seg; for 2–4 year holds run the decision worksheet first. A 1031 exchange defers the recapture entirely, which changes the calculus.

3. The property is your primary residence. §168 depreciation applies only to property used in a trade or business or held for the production of income. Owner-occupied housing doesn’t qualify. House-hacking scenarios (one unit of a duplex you live in, the other unit rented) are a separate case — see our house-hacker’s duplex guide. Pure owner-occupied SFR is out.

The break-even formula for sub-$200K cost seg, simplified:

(Depreciable basis × Reclass %) × Federal bracket = Year-1 federal savings
Year-1 federal savings ÷ Study cost = ROI

Anything north of 5× ROI is worth ordering. Below 3× ROI, hold off — either find a higher-bracket year, wait for a passive-income-generating event, or skip cost seg and depreciate on the 27.5-year schedule.

The component reality at small property basis

A sub-$200K property has the same MACRS class structure as a $1M property — just less of each component. The 5-year, 7-year, 15-year, and 27.5-year breakdown is identical; absolute dollar amounts scale down with basis.

For the illustrative $150K SFR above, a component allocation might look like this:

MACRS class	Components	% of basis (illustrative)	Dollar amount on $120K basis
5-year personal property	Carpet, appliances, fixtures, cabinetry	8.5%	$10,176
7-year personal property	Specialty furniture (rare in residential)	0.3%	$384
15-year land improvements	Driveway, landscaping, fencing, lighting	7.2%	$8,640
27.5-year residential	Building shell, roof, foundation, plumbing	84.0%	$100,800
Total reclassified	5+7+15 year	16%	$19,200

The land allocation deserves its own attention at small property basis. A $150K rural rental might have a 10% land allocation; a $150K urban infill rental might have 30%. The default 20% assumption used in our calculator is a national median — your specific property’s assessor records will produce a different number, and Cost Seg Smart pulls the actual county data into every study. A 10-percentage-point swing in land allocation moves Year-1 savings by ~$768 at a 32% bracket in this illustrative example.

Form 3115 lookback — the saving grace for small-property cost seg

This is the lever that makes sub-$200K cost seg pay in a meaningful share of cases.

If you bought a rental 2+ years ago and never did a cost segregation study, you’ve been depreciating on the 27.5-year schedule the whole time. Every year of “default depreciation” you took was understated relative to what an engineering-based study would have produced. The IRS allows you to correct that — not by amending old returns, but by filing Form 3115 (Application for Change in Accounting Method) with your current return, with automatic consent under Rev. Proc. 2015-13.

The §481(a) catch-up adjustment captures every year of missed accelerated depreciation in a single current-year deduction. No amended returns, no penalty, no IRS approval needed.

Worked example — same $150K SFR, but you bought it in 2022 and held it through 2026 (4 tax years before this one):

Line item	Current-year only	With Form 3115 lookback (4-year catch-up)
Year-1 accelerated deduction	$19,200	$19,200
Cumulative prior-year accelerated deduction missed (illustrative)	—	~$9,984
Form 3115 §481(a) catch-up adjustment	—	$9,984
Total current-year deduction	$19,200	$29,184
Federal tax savings at 32% bracket	$6,144	$9,339
Return on the $495 study	12×	19×

The catch-up figure is illustrative: the real §481(a) amount depends on the placed-in-service year, the bonus rate that applied then, and what was already depreciated.

In this illustrative example, lookback raises the return on the study by roughly half on a 4-year-held property. For properties owned 3+ years, lookback frequently turns a “marginal” sub-$200K cost seg into an obvious win.

See our Form 3115 cost segregation guide for full mechanics, including how the §481(a) adjustment flows through the K-1 for partnerships and how to handle properties that have been refinanced or had basis events since acquisition.

Pricing reality — $495 automated vs $3,000 traditional firm

The cost segregation industry has stratified into three pricing tiers. Methodology is identical across all three — same industry-standard 2026 construction cost data, same MACRS classification per Rev. Proc. 87-56, same IRS Pub 5653 framework. What changes is the labor model.

Provider tier	Sub-$200K residential price	Turnaround	Methodology
Automated (Cost Seg Smart)	$495	Usually the next business day	Engineering-based, structured data inputs (assessor + satellite + industry-standard cost data), internal technical review & QC
DIY cost-seg software	~$495	Self-serve, 2–4 hr customer labor	Same engineering library, customer does the work
Mid-tier traditional (ELB, CSSI, Bedford, similar)	$1,500–$3,500	2–6 weeks	Hybrid — partial automation, no full on-site visit
National traditional engineering firms	Won’t quote under $200K typically	4–8 weeks	Full on-site engineering — built for $5M+ properties

For sub-$200K residential, the automated and DIY tiers are the rational choice. In the illustrative example above, a $3,000 traditional engagement on a $150K rental returns about 2× its fee at a 32% bracket — borderline. A $495 automated study on the same property returns about 12×. Same methodology, same defensible report, fraction of the cost.

If you want to read the deliverable before ordering, the sample cost segregation reports page has sample PDFs, modeled by our engine, covering every property type. The under-$200K residential sample is open-access — no email gate.

STR exception — small short-term rentals reclassify higher

The most consistent exception to “sub-$200K cost seg is borderline” is the small short-term rental. Furnished STRs most often reclassify around 26% of basis (typically 19–39%), against around 16% for a single-family rental, because:

• Furnished — every piece of furniture, appliance, and decor is 5-year personal property
• Exterior amenities — pools, hot tubs, outdoor kitchens, fire pits are 5- or 15-year property
• Higher finish density per dollar of basis (STR investors generally upgrade finishes for guest experience)
• Smaller average square footage means the land-improvement share is proportionally larger

Worked example — $175K furnished STR in a vacation market:

Line item	Amount
Purchase price	$175,000
Furnishings + FF&E acquired with property	included
Land allocation (20%)	$35,000
Depreciable basis	$140,000
Illustrative STR reclass % (representative rate)	26%
Year-1 deduction (100% bonus)	$36,400
Federal savings at 32%	$11,648
Federal savings at 37%	$13,468
Cost Seg Smart study cost	$495
Net Year-1 benefit at 32%	$11,153
Return on the study fee at 32%	24×

STR economics make cost seg viable down to about $125K depreciable basis ($156K purchase with 20% land). Below that, the study-fee-as-percentage-of-benefit starts to eat ROI even with STR’s higher reclassification.

If your STR qualifies for the short-term-rental loophole under §469 (average stay ≤7 days + material participation), the Year-1 deduction can offset W-2 wages — a different and much larger benefit than passive offset. See our STR material participation time log guide for the documentation requirements that make non-passive treatment defensible.

Order your sub-$200K study

If your property is over $125K depreciable basis (≈$156K purchase) and you have current-year tax liability to offset, the $495 automated study delivers usually by the next business day with full audit-support scope per /audit-defense/ and a CPA-Ready Guarantee. Remote for most residential and small-commercial studies; on-site observation for larger commercial projects, no email gate on the sample reports.

For a property you bought 2+ years ago, the order form lets you flag a Form 3115 lookback — the §481(a) catch-up adjustment frequently doubles the Year-1 benefit.

Related guides:

• Cost Segregation Under $500K — the next price bucket up
• Cost Segregation $500K–$1M — where most residential cost seg happens
• How Much Does a Cost Segregation Study Cost? — line-by-line on the deliverable
• Form 3115 Cost Segregation Lookback — the §481(a) catch-up mechanics
• Sample Cost Segregation Report — sample PDFs across property types
• Cost Segregation Decision Worksheet (XLSX) — break-even math, your numbers

Frequently asked

Is cost segregation worth it on a property under $200,000?

Sometimes — the math depends on three variables: depreciable basis (price minus land), federal bracket, and study cost. On a typical $150K SFR with 20% land allocation, depreciable basis is $120K. At the representative rate we publish for single-family rentals (most often around 16%), the accelerated Year-1 deduction is roughly 16% of that $120K, and the federal savings are that deduction times your bracket. The worked table in this guide computes the deduction, the savings and the return on the study fee from the published band. A traditional firm's study at several times the fee on the same property is borderline. STRs and properties qualifying for Form 3115 lookback shift the math meaningfully in favor.

What's the cheapest cost segregation study available?

Cost Seg Smart prices residential under $300K depreciable basis at $495 — the price floor for an engineering-based study with industry-standard 2026 construction cost data, MACRS classification per Rev. Proc. 87-56, IRS ATG-aligned documentation, and internal technical review & QC. DIY cost-seg software products price at the same $495 point but transfer 2–4 hours of customer labor per property. Templated 'studies' priced below $400 typically use rule-of-thumb percentages without component documentation — IRS Pub 5653 explicitly disfavors these as audit posture.

Can I do cost segregation on a $100,000 rental?

Technically yes, economically rarely. At $100K purchase price, depreciable basis after a 20% land carve is $80,000. At the representative single-family rate we publish (most often around 16%), that surfaces roughly 16% of $80,000 in Year-1 accelerated deductions, a four-figure federal saving at a 24% bracket. The study can still pay for itself several times over — but recapture exposure on a low-basis property, study-fee-as-percentage-of-Year-1-benefit, and limited future depreciation make the absolute dollar benefit small. Run the numbers before ordering; the cost segregation calculator at /cost-segregation-calculator/ takes 30 seconds.

Does Form 3115 lookback save small properties?

Often yes. If you bought a $150K rental in 2022 and never did cost seg, three full years of accelerated depreciation are sitting on the table. Form 3115 (automatic consent under Rev. Proc. 2015-13) captures the §481(a) catch-up adjustment in one current-year deduction. For a $150K SFR with $120K basis at the representative single-family rate, the §481(a) catch-up adds a meaningful share of the reclassified amount to the current-year deduction, which raises the return on the same study; the worked lookback example in this guide shows the illustrative arithmetic.

What about a small STR — does cost seg pay there?

Better than residential SFR at the same price point. Furnished short-term rentals most often reclassify around 26% of basis (typically 19–39%), against around 16% for a single-family rental, because they carry heavier 5-year FF&E loads — appliances, furniture, decor, exterior amenities. A $175K STR with $140K basis at the representative STR rate (around 26%) surfaces roughly 26% of $140,000 in Year-1 deductions, several times the study fee in federal savings at a 32% bracket. STR economics make cost seg viable down to about $125K depreciable basis.

Will the IRS audit a small-property cost seg study?

Cost segregation is IRS-recognized methodology — the IRS publishes a 120-page Audit Techniques Guide (Pub 5653) describing how examiners evaluate studies, not whether to challenge them. What invites scrutiny is methodology weakness: percentages without component basis, missing land allocation, absent MACRS class citations. An engineering-based study on a $150K property is examined the same way a study on a $1.5M property is examined — against the same 13 quality elements. See our audit-defense scope at /audit-defense/ for what's covered if a Cost Seg Smart study is examined.