Speed

Under 1 hour. Engineered.
CPA-ready.

The 30-second answer

A traditional cost segregation engagement runs 4–8 weeks because the workflow includes a discovery call, site visit scheduling, and manual report drafting from scratch. Cost Seg Smart delivers the same engineered, IRS ATG-aligned PDF in under 60 minutes by replacing those steps with structured property data, RSMeans 2026 cost-library lookups, and a 16-check quality-control gate with engineer review on outliers. The methodology is identical; the labor model is what's compressed. Studies start at $495.

From order placement to PDF in your inbox: under 1 hour. Here's what happens during that hour, broken down by the actual stages of the engine.

Minute 0–1: Order received

Property characteristics flow in via the order form (address, basis, purchase date, property type, square footage, year built, bedrooms, bathrooms, key features). The cost-seg engine kicks off a parallel set of data lookups: county assessor records (for land allocation), RentCast property API (for verified property characteristics), OpenStreetMap Overpass (for building-type classification), satellite imagery (for site-work verification), and BLS Producer Price Index (for cost-index time adjustment to your year of acquisition).

Minute 1–10: Component analysis

The engine builds the component library appropriate for the property type — residential, STR, condo, multifamily, or commercial. It applies regional cost multipliers from RSMeans 2026 (six-tier geographic index: pinned metros, calibrated metros, manual cities, state, region, national fallback), runs the MACRS classification across 200+ components per Rev. Proc. 87-56, and reconciles the totals to your purchase basis with a scaling factor applied uniformly. The output is a per-component breakdown with $/SF derivation, recovery period, and citation back to RSMeans line items.

Minute 10–25: Quality control gate

Sixteen QC checks gate every report before generation: hard invariant checks (component sums match basis to the penny), market regime checks (rf_raw within calibrated bands), calibration outlier detection (per-property-type accel% within engine-medians), input quality checks (assessor land split reliability), and narrative safety checks. Reports come out as PASS (ship), REVIEW (engineer hand-review before ship), or FAIL (block). The current PASS rate sits above 90%; REVIEW reports route to a senior engineer with median turnaround under 30 minutes.

Minute 25–55: PDF generation

The narrative engine writes 18 contextual sections — executive summary, property characteristics, methodology, component analysis, MACRS classification table, Year-1 depreciation schedule, multi-year MACRS schedule, Form 3115 §481(a) section for lookback, audit-defense methodology aligned to the 13 IRS ATG quality elements, references list. PDF assembles with engineer attestation, MACRS schedules, and a CPA-Ready cover sheet that maps directly to Form 4562. Average length: 35–45 pages.

Minute 55–60: Delivery

Email lands in your inbox with the PDF attached. The same PDF is also downloadable from a permanent S3 link tied to your order ID — your CPA can re-download it any time during the property's holding period without re-paying.

What we don't do at this speed

We don't ship reports that need rework. The QC gate catches outliers before generation; engineer review fires on edge cases (unusual property type, multi-parcel coordinated acquisitions, properties under $150K basis where the math gets thin). If the report can't ship to PASS quality, you're notified and we either complete it manually or refund. We also don't take on properties that aren't a fit — the calculator on every page flags scenarios where the math doesn't work (basis below $150K, low bracket, planned sale within 12 months without 1031). Full process documentation lives at /methodology/.

Why most firms can't do this

A traditional cost segregation firm's workflow is built around a 30-hour-per-property labor model: project manager intake, engineer site visit, manual cost-database lookups, hand-built schedule, custom-written report. The labor model is the bottleneck — not the methodology. The methodology (RSMeans + MACRS + IRS ATG) has been standardized for years. What used to require a custom engagement per property is now applicable across thousands of properties via structured data, which is how the timeline collapses from 4–8 weeks to under an hour while the report quality stays defensible.

Last reviewed: May 2026. Maintained by the Cost Seg Smart Editorial Team. For full methodology see /methodology/; for pricing tiers see /cheap-cost-segregation/.

Frequently asked

Is one hour enough time for engineering review?

Engineering review happens before report generation, not after. The 16-check QC gate evaluates every report against hard invariants (component sums match basis to the penny), market regime calibration, and input-quality reliability gates. Reports that pass all 16 checks ship automatically; reports flagged on any check route to senior engineer manual review with median turnaround under 30 minutes. The methodology is engineered to surface outliers before delivery — the speed comes from automating the deterministic 90% of decisions, not from skipping engineering.

What does the QC gate actually check?

Five categories of checks: (1) hard invariants — component sums must match depreciable basis to the penny, MACRS class totals must reconcile, no negative components; (2) market regime — rf_raw diagnostic ratio within calibrated bands per property type; (3) calibration outliers — per-class allocation percentages within engine-median +/- thresholds; (4) input quality — county assessor land-split reliability above gate, RentCast cross-verification clean; (5) narrative safety — generated text passes contradiction and accuracy checks. Reports come out PASS / REVIEW / FAIL; PASS ships, REVIEW goes to engineer, FAIL blocks.

What if my property is unusual?

Unusual properties (multi-parcel coordinated acquisitions, very large mixed-use, specialty industrial with custom MEP, hospitality with food-and-beverage build-out) trip QC flags by design and route to manual engineer review. We may follow up for additional photos or details, and we may extend turnaround to 4–24 hours instead of 60 minutes. For genuinely complex cases above $5M with significant on-site judgment requirements, we'll tell you up front that a traditional firm is the better fit and decline the order.

Is the report identical to a 4-week study?

Yes for residential and small-commercial. The deliverable is a 35–45 page CPA-ready PDF with the same component-level analysis, MACRS classification per Rev. Proc. 87-56, depreciation schedule, Form 3115 §481(a) section, engineer attestation, and methodology section addressing the 13 IRS ATG quality elements. The difference between our hour and a traditional firm's 4–8 weeks is the labor model, not the report contents. For very complex commercial properties over $5M with unusual specialty assets, on-site engineering judgment can materially affect the schedule — a traditional firm remains the right fit there.

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