Written for CPA firms and tax advisors. If you're a property owner, the client-facing version of this comparison is how to compare cost segregation providers.
Comparing KBKG and the RentalWriteOff partner program is not a quality contest between two study providers. It is a decision about which position your firm takes on cost segregation, and the decision sorts by engagement type. The short version:
- Large commercial and complex engagements. Refer them to a national full-service firm, and KBKG is a strong destination: a specialty tax practice reporting more than 30,000 completed studies, with team members who contributed to the IRS Audit Techniques Guide for cost segregation, custom-quoted at what market guides generally cite as $5,000 and up.
- The residential volume in your book, kept in-house. The RentalWriteOff partner program. Your firm owns the engagement and reviews the work; RentalWriteOff prepares the property-specific analysis and documentation, delivered white-label under your firm's brand with audit support included.
- Operating KBKG's $495 self-serve software in-house. Available, and it is the position to take deliberately or not at all: it makes your firm the preparer, the report rests on the inputs your staff assembles, and the substantiation burden sits with the client you advised.
The rest of this article is the detail behind those three lines: what each product actually is, the position each one puts a firm in, and where each fits a client book.
What KBKG offers, in two lanes
KBKG serves property owners through two distinct products. The first is full-service work: custom-scoped, custom-quoted engagements with published market guides putting national full-service fees at roughly $5,000 and up. That pricing is rational for the properties it targets, and it is why full-service firms rarely see a $450,000 single-family rental.
The second lane is their answer to exactly that gap: self-serve software, sold at costsegregation.com, listing residential reports from $495 as of this writing. The operator, whether that is the client or your staff, enters the property data, and the platform generates a report from its cost model, capped at $1.5 million of building basis. Audit defense is included per their site. It is a legitimate product from a firm that knows the discipline.
The three positions a firm can take
Strip away the branding and a firm has three ways to get a study into a client's return:
- Refer out. Clean and appropriate for large commercial work. The trade-off is structural: the engagement leaves the firm, the provider prices and owns the client relationship for that work, and your role ends at the introduction. For a once-a-year commercial referral that is fine; for a book with dozens of residential candidates it means repeatedly sending value out the door.
- Operate software. The $495 tool moves the work into your office, but it makes the firm the preparer. The output is only as good as the inputs your staff assembles, the basis cap excludes part of the book, and the hours land in your office at exactly the season you have none to spare. You also end up standing behind numbers a model generated, which is a different posture than reviewing a specialist's signed work product: if the return is examined, the support for the classification is whatever was keyed into the tool, and the substantiation burden sits with the taxpayer your firm advised.
- Partner delivery. The firm keeps the engagement and the client relationship; the engineering-based analysis, reclassified asset schedule, and documentation are prepared by RentalWriteOff. Through the partner program, the report can ship white-label under the firm's brand, while the firm retains responsibility for professional advice and filing decisions.
The review posture matters more than it first appears. However the study is sourced, the depreciation schedules flow to Form 4562 or, for look-back candidates, through Form 3115 and the Section 481(a) catch-up, under your firm's signature. What you want under that signature is a work product you evaluated, not one you manufactured between deadlines. The evaluation criteria are in how to evaluate a cost segregation report.
This is also why RentalWriteOff does not sell self-serve software at all, to firms or to owners. The distinction is not software versus no software: RentalWriteOff runs industry-leading analysis software of its own, and that software staying in expert hands is how a full-service-class deliverable ships in 2 business days at pricing built for residential volume. The company's position is that a study assembled from the preparer's own inputs is not a defensible work product, whoever the preparer is, and it does not ask a firm to put its signature behind one. The partner deliverable is the finished report, an Engineering-Based Analysis, Expert Reviewed, with audit support included, and an intake that takes minutes rather than preparation cycles.
Side by side
| KBKG full-service | KBKG software | RentalWriteOff partner | |
|---|---|---|---|
| What the client receives | Expert-prepared study | Self-prepared report | Expert-prepared study |
| Firm's position | Referrer | Preparer | Engagement owner, reviewer |
| Who performs the analysis | Their team | Your staff or the client, via the tool | RentalWriteOff: Engineering-Based Analysis, Expert Reviewed |
| Property fit | Larger and commercial | Residential under $1.5M building basis | Residential rentals, SFR through small multifamily and STR |
| Published pricing | Custom quote, market guides cite $5,000+ | From $495, tiered by basis | Not published; see the partner program |
| Deliverable branding | Theirs | Theirs | Your firm's brand |
| Turnaround | Scoped per engagement | On completion of inputs | 2 business days |
| Audit support | Included | Included, per their site | Included |
Where KBKG is the right answer
Be clear-eyed about the cases that belong with a national full-service firm. A client acquiring an eight-figure commercial asset, a mixed-use development, an engagement that needs to layer Section 179D or R&D credits alongside the study, or a matter likely to end up in examination or Tax Court: refer those out, and KBKG is a strong destination. The partner program is not a substitute for that lane, and pretending otherwise would be bad advice.
Where the partner model fits
The partner model is built for the book the full-service lane prices out and the software lane hands back to you: residential rentals and short-term rentals held by the clients you already serve. Screen each property on its own facts, then have the client’s tax professional determine whether the timing, basis, and loss rules make the strategy appropriate.
At that volume, the economics of position matter. A referral sends the work out dozens of times a year; software puts dozens of preparation cycles into your office. Partner delivery converts the same demand into a service line your firm owns, scoped and reviewed by your staff, produced on a 2-business-day cycle that survives busy season. The full analysis of what that service line looks like operationally, including the screening criteria and the review workflow, is in the guide to how CPA firms add cost segregation.
The practical takeaway
Sort the decision by client, not by provider. Commercial and complex engagements go out the door to a national firm, and KBKG has earned its place on that shortlist. The residential volume in your book is a different question: it is recurring, it is screenable, and it is large enough that the difference between referring it, preparing it yourself, and owning it as a reviewed service line compounds every season. The partner program exists for that middle of the book.
For CPA firms and advisors: RentalWriteOff prepares the engineering-based analysis and documentation for your firm's independent review, either white-label under your brand or by referral. Standard residential studies target two-business-day delivery after complete intake and include audit support. Compare the partner programs or browse more resources for tax professionals.