Summary
Software that catalogs a building makes predictable kinds of errors. It counts the same asset twice. It puts a structural component in the 5-year class. It prices an item far outside its benchmark. It produces class totals outside the range typical for the property type. It fills a missing input with a default and moves on. The usual answer is a reviewer sitting between the software and you. SegFlow does not have one. Instead, a second, independent pass with a different job reviews the first against the photos and the rules, fixes or flags what it finds, and writes review notes for the CPA (certified public accountant) that tell you what to verify. You are the reviewer. This paper explains why that design is cleaner, what each pass does, what the notes look like, and how the included second run closes the loop.
The case against a reviewer queue
A human reviewer inside the vendor adds a queue, and a queue adds days. It also blurs responsibility. A quick check by someone who is not the preparer is not a professional review, yet its existence tempts the preparer to treat the draft as pre-approved. The examiner will not ask the vendor's reviewer to explain a classification. The examiner will ask the person who signed the return, and Circular 230 (the Treasury rules for practice before the Internal Revenue Service, or IRS) requires that person to exercise due diligence as to accuracy, whoever prepared the workpaper.
So the question is not whether a human reviews the study but which human. The answer that keeps the liability line clean is the preparer. The study states on its face that it was prepared with software assistance for review by the taxpayer's preparer, and its design exists to make that review fast and well aimed.
Pass one: the author
The author pass receives every photo and document in one context and writes the ledger. Each line records the component name, quantity and unit, location, the photos that evidence it, the MACRS (Modified Accelerated Cost Recovery System, the IRS depreciation schedule) class with the authority relied on, the cost source, and the raw and reconciled cost. Items considered and not reclassified are listed as exclusions with reasons. The author pass is thorough by design, and thoroughness is where the five errors come from.
Pass two: the auditor
The review pass is a separate, independent pass with a different job. It is given the ledger, the photos, the documents and the rules, and it is asked to find fault. It checks five things.
Duplicates. The same water heater photographed from two angles, the same refrigerator in two kitchen photos, one fence counted from both sides of the yard. The auditor merges the lines and records the merge.
Misclassification. A line whose class does not survive Treas. Reg. §1.48-1(e)(2), which defines structural components, or the six permanence factors from Whiteco Industries v. Commissioner, 65 T.C. 664 (1975). A central air conditioning condenser in the 5-year class is the standard case: the regulation lists all components of a central heating or air conditioning system as structural, so the line moves to the building and the authority is written on the line.
Cost outliers. A line priced far outside the benchmark for its type and quantity. The auditor reprices it from benchmark and market data, adjusted for location and purchase date, and states the basis.
Benchmark deviation. Totals by class outside the range typical for the use type. Not an error on its own, but the signal that something above is wrong or that a large line needs the preparer's eyes, so the auditor names the lines driving it.
Defaulted inputs. A land value taken as a percentage because no assessor record was uploaded, square footage inferred from photos, a furnished flag assumed. Each default is carried as an assumption with its consequence and placed at the top of the review notes, because it changes every number below it.
The auditor cannot invent evidence. Where the photos do not settle a question, it does not guess toward the shorter life. It leaves the longer life in place and tells the preparer what evidence would change it.
The review notes for the CPA
The notes come in two parts. Verify items come first: what the preparer must confirm before signing, ordered by effect on the result. Notes come second: what the auditor changed and why, so nothing is altered silently. An illustrative set for a single-family long-term rental, round numbers and not a client result, reads as follows.
Verify. Land value was defaulted to 15 percent of the purchase price ($75,000) because no assessor record was uploaded; if the assessor's split differs, the depreciable basis and every class total change, so upload the record for the second run. The engineered wood flooring ($14,000) was moved to 27.5-year as a glued-down permanent covering; if the floor is a floating installation, the 5-year class is supportable and the line should be reclassified. The rear yard was not photographed, so the fencing and patio were excluded; send the site photos to include them.
Notes. Two refrigerator lines were merged; photos 12 and 14 show the same unit. The condenser ($8,000) was reclassified to 27.5-year because it serves the whole dwelling. A ceiling fan priced at $6,000 was repriced to $400 from benchmark. The flooring line was moved as described above.
An illustrative study, before and after the auditor
The same house: purchase price $500,000, land defaulted to $75,000, depreciable basis $425,000. The author pass listed $100,000 of 5-year property and $36,000 of 15-year land improvements, $136,000 in all, 32 percent of basis, above the range typical for a long-term single-family rental. That triggered the closer look.
After the merge ($2,000), the condenser reclassification ($8,000), the fan repricing ($5,600) and the flooring move ($14,000), the 5-year total is $70,400 and reclassified basis is $106,400, about 25 percent. The auditor lets that stand and flags the flooring and the land default as the two items that could move it in either direction.
The preparer confirms with the owner that the floor is glued down, so the flooring stays in the building, uploads the assessor record, which shows $120,000 of land, and adds the owner's rear-yard photos. The second run reduces the depreciable basis to $380,000 and adds $10,000 of 15-year fencing and patio. Version 2 arrives with a page showing each line added, removed, reclassified or repriced, the totals by class before and after, and the reason for each change. Reclassified basis in version 2 is $116,400 of a $380,000 basis, about 31 percent, and every number traces to an uploaded document or a stated assumption.
The second run, and why there is no third
One update is included after delivery. The preparer adds documents, photos or comments on the review notes; both passes run again on the full set of inputs; version 2 arrives with the change page. There is no third run, and the ledger is not edited inside the tool. Final adjustments belong in the preparer's own copy of the Excel ledger or the Word document, where they are part of the firm's workpapers and carry the firm's reasoning. The vendor's job ends at a well-documented draft; the preparer's judgment is recorded where the preparer controls it.
What the review pass does not do
It does not visit the site, open walls or interview the contractor. It does not know facts absent from the uploads, which is why the intake questions and the free-text description exist. It does not sign anything. For large or specialized commercial property, or where an examination is expected, an engineered study with a site inspection may be the better instrument.
What this means for your firm
You receive a study that has already been argued with once. The review notes give you an ordered list of what to confirm and a record of what was changed, so your review starts at the items that matter rather than at line one. The included second run turns your answers and the owner's late photos into a version 2 with a written change log, the trail an examiner expects to see. And because there is no reviewer between the study and you, there is no ambiguity about whose review the study relies on.