# How to hire a cost segregation practitioner A step-by-step way to choose a cost segregation practitioner: what to ask, what a sample report should contain, how fees should work, and how to verify a credential. ## Short answer Hire a cost segregation practitioner the way you would hire anyone whose work will be examined by someone else later: on evidence of competence, a sample of the actual product, a clear scope and fee, and a verifiable credential. Because no license exists and the IRS prescribes no qualifications, the checking is yours to do, ideally together with the tax adviser who will apply the study to your return. This article gives you a process, the questions to ask, what a real sample report contains, how fees should and should not work, and what to put in the engagement letter. It is general education, not tax advice. ## Before you contact anyone Two conversations come first, and both are with your own tax adviser. 1. **Is a study likely to help you at all?** The study changes the timing of depreciation; it does not create deductions or refunds. Whether earlier deductions help depends on your other income, the passive activity rules that limit rental losses for many taxpayers, how long you plan to hold the property and the recapture of accelerated depreciation as ordinary income on sale. Your adviser can tell you whether the timing benefit is real for you before you pay for a study. 2. **Who will do what?** Decide with the adviser who prepares the study, who reviews it, who applies it to the return and who answers if it is examined. Practitioners who work well with advisers expect this conversation. If your adviser is unfamiliar with cost segregation, that is a reason to involve a second adviser, not a reason to let the study preparer take over the return. ## Step 1: shortlist on evidence, not on marketing Look for practitioners who identify themselves and their reviewers by name, describe their approach in terms of records, drawings and site visits, and publish what credential they hold and how it can be verified. Ignore claims of government approval; no practitioner, method or organization is approved by the IRS for cost segregation, and the IRS publishes expectations for examiners rather than endorsements. Treat a promised percentage or a promised tax result before anyone has seen your documents as a disqualifier. The NBCSS directory is one place to look. It lists members by service coverage, labels self-reported background as self-reported, and shows credential status only from verified records. Use it the way you would use any professional directory: as a starting list to check, not as a recommendation. ## Step 2: ask the questions that reveal method Ask each candidate the same questions and write down the answers. | Question | A good answer sounds like | A poor answer sounds like | |---|---|---| | Who will prepare the study and who will review it? | Named people, their backgrounds, and a reviewer who did not do the work | "Our team" | | What approach will you use on my property? | Actual cost records where they exist, drawings, a site visit, a documented estimating method where records are missing | A percentage, a template, or "our software handles it" | | What documents will you need from me? | A specific list: closing statement, appraisal, contracts, pay applications, drawings, invoices, photographs, prior depreciation schedules | "Just the purchase price and the address" | | How will you separate land? | Appraisal, assessor allocation or other evidence, with the reasoning documented | "The standard percentage" | | How do you handle a building I bought years ago? | A change in accounting method, coordinated with your adviser | Blank look, or "we just amend" | | What does the report contain? | Methodology, legal analysis for classifications, asset list, costs, reconciliation to basis, assumptions and limitations | A summary page with totals | | What is your role if the return is examined? | A defined role in the engagement letter, at a stated fee | "That never happens" | | What credential do you hold and how do I verify it? | The body, the scheme, and a verification page | "Certified" with no issuer named | ## Step 3: read a redacted sample against the IRS list Ask for a redacted sample report for a property like yours and compare it with the principal elements of a quality study that the IRS lists in its Audit Techniques Guide. You should be able to find each of these without help: - The preparer identified, with credentials, experience and expertise stated. - A description of the methodology and the steps taken to classify assets and determine costs. - The documentation used: site visit, drawings, contracts, records, photographs. - Interviews with the people who know the property. - A legal analysis supporting the classifications, not just a list of asset classes. - Unit costs and take-offs, with the source of the costs. - An organized asset list that ties to a fixed-asset ledger. - A reconciliation of allocated costs to total actual costs, and an explanation of how indirect costs were treated. - Identification of section 1245 property. - Consideration of related issues, such as a change in accounting method for an existing building. If the sample has totals and a chart but no asset list, no methodology and no reconciliation, the finished product will look the same. The IRS guide also says that examiners request the complete study, the workpapers, the construction documents and the preparer's qualifications. Ask whether the practitioner keeps and can produce all four. ## Step 4: understand the fee Fees vary with the size and complexity of the property and the state of the records, and this article gives no figures. What matters is the structure. - **Fixed or hourly fees for a defined scope** are ordinary professional pricing. Ask what is included, what triggers extra charges and whether a site visit is in the price. - **Fees stated as a share of "tax savings"** deserve care. The saving is not the practitioner's to know; it depends on your return, and it may be limited or deferred by the passive activity rules. Practitioners who practice before the IRS are subject to Circular 230, which sets competence and diligence standards and restricts contingent fees for most return-preparation work. Ask your adviser how the fee structure interacts with the rules that apply to them. - **Bundled offers** that include "audit defense" or software subscriptions should be priced separately so you can see what the study itself costs. ## Step 5: put it in writing The engagement letter should state: 1. The property, the tax year and the purpose of the study. 2. The scope: which documents you will provide, whether there is a site visit, what the deliverable contains. 3. The approach, in the terms used above. 4. Who prepares, who reviews and who signs the report. 5. The fee and what changes it. 6. The timeline, including document collection and your review of the draft. 7. The practitioner's role and fee if the return is examined, and how they will work with your adviser. 8. Confidentiality and the handling of your documents. 9. What the study is not: not tax advice, not a decision about your return, not a guarantee of any tax outcome. ## Step 6: verify the credential and the person A credential means only what the issuing body's published scheme makes it mean, and only if you can verify the holder. - Go to the issuing body's verification page and confirm the name, the credential and its standing. NBCSS credentials, for example, are verified at the public verification page, and the directory rejects credential claims that cannot be verified. - Read the body's published requirements: experience standard, assessment parts, who decides, appeals, maintenance. A credential with no published standard is a label. - If the practitioner or reviewer holds a licensed profession such as engineering or public accounting, check that license with the state board and note what it does and does not cover. - Ask for references from tax advisers who have relied on the practitioner's studies, not from property owners alone; advisers see the workpapers. ## Warning signs, in one list - A result promised before the documents are seen. - A fee tied to a saving nobody has calculated. - No site visit for a property that warrants one, with no explanation. - A sample report without an asset list, methodology or reconciliation. - Claims of IRS approval, recognition or certification. - Reluctance to name the preparer and reviewer or to state their qualifications in the report. - Pressure to bypass your tax adviser. - A credential you cannot verify. ## After the study arrives Read the draft with your adviser before it is final. Check that the total reconciles to your basis, that the land separation is explained, that assumptions and limitations are stated, and that the asset list is something your adviser can carry into a depreciation schedule. Ask about anything you do not understand; a practitioner who cannot explain a classification in plain words to the client has a weak legal analysis behind it. Keep the study, the workpapers you were given and the engagement letter with your tax records for as long as the property is depreciated and then through the period after sale. ## What people ask on Reddit and other forums The searches that lead people to these threads are usually phrased "how to choose a cost segregation provider", "cost segregation firm", "verify cost segregation credentials". Threads that show up for "cost segregation reddit" on r/realestateinvesting and r/tax are often owners comparing quotes. The questions that recur, answered from the sources below: **"Two quotes, one is a third of the price. What am I missing?"** Compare scope and the sample report, not the price. A questionnaire product with no site visit, take-offs, legal analysis or reconciliation is cheaper because it omits the elements the IRS guide lists. **"They want a percentage of my savings. Normal?"** Be careful. The saving is not theirs to know; it depends on your return and the passive activity rules. Ask your adviser how such a fee interacts with the rules that apply to them, including Circular 230's restrictions on contingent fees for most return work. **"The provider says the IRS approves their method."** No provider, method or organization is approved by the IRS for cost segregation. That claim disqualifies the provider. **"Can I skip my CPA and let the cost seg firm handle it?"** No. The study is an input; the adviser decides whether and how to use it, models the passive activity rules and handles the return mechanics. ## Questions people also ask ### Should I hire an engineer or a CPA? Neither profession is required, and neither license covers cost segregation on its own. Hire the person or team who can show, in a sample report, both construction and cost competence and depreciation law competence, and who works with your tax adviser rather than around them. ### Is a cheaper study a worse study? Price alone tells you little. Compare the scope and the sample. A low price for a questionnaire-based product that lacks the elements the IRS lists is expensive if it fails when it matters; a higher price for a fully evidenced study on a small property may still not be worth it for you. Your adviser can help with that judgement. ### Do I need a site visit? The IRS guide describes studies built on documentation including site visits as the norm for quality work. Whether a visit is warranted depends on the property and the records; a practitioner should explain their decision either way. ### Can I use a study from a previous owner? A prior study can be evidence, but your basis, your acquisition date and current law govern your depreciation. Give any prior study to the practitioner and your adviser and let them decide what it supports. ### What if the practitioner says my adviser is wrong? Disagreements between a preparer and an adviser happen and are worth hearing out, but the return is the adviser's responsibility. Ask both to put their reasoning in writing, with sources, and decide with the adviser who signs. ## Sources - https://www.irs.gov/pub/irs-pdf/p5653.pdf — IRS Publication 5653, Cost Segregation Audit Techniques Guide (Rev. 2-2025): Chapters 3, 4 and 5. - https://www.irs.gov/pub/irs-pdf/pcir230.pdf — Treasury Department Circular No. 230: §10.22, §10.27, §10.35. - https://www.irs.gov/publications/p527 — IRS Publication 527 (2025), Residential Rental Property: Chapter 3, Limits on Rental Losses. - https://www.irs.gov/publications/p544 — IRS Publication 544 (2025), Sales and Other Dispositions of Assets: Chapter 3, Section 1245 Property. - https://nbcss.org/standards — NBCSS standards and governance: verification, ethics and records. ## Related reading - [Who is qualified to perform a cost segregation study?](/articles/who-is-qualified-to-perform-a-cost-segregation-study) - [What a cost segregation study does](/articles/what-a-cost-segregation-study-does) - [How to read a report's limitations](/articles/reading-report-limitations) - [When to involve a tax adviser](/articles/when-to-involve-a-tax-adviser) - [The evidence a cost segregation study needs](/articles/evidence-a-cost-segregation-study-needs) - [Find a practitioner in the NBCSS directory](/directory) · [Verify a credential](/verify) --- Canonical: https://nbcss.org/articles/how-to-hire-a-cost-segregation-practitioner Published: 2026-09-25 · Last content change: 2026-09-25 Not professional advice: general educational information from the National Board of Cost Segregation Specialist (NBCSS); not accounting, tax, legal, financial, investment or engineering advice. Verify with a licensed CPA, enrolled agent, attorney or other qualified adviser before acting.