Most owners approach cost segregation with the same handful of questions, and getting straight answers up front is the difference between a study that pays off and one that disappoints. If you are weighing whether a study fits your property, the right questions will tell you more than any sales pitch.
As co-founder of Seneca Cost Segregation and a real estate investor myself, I field these questions from owners and their accountants every week, and the pattern is clear. What we find is that the owners who ask sharper questions before they commit end up with better studies, because they push the firm to be specific about method, timing, and defense.
The sections below group the questions that matter into three buckets: the ones to ask about your property, the ones for your CPA, and the ones that separate a serious firm from a weak one.
TL;DR — Cost Segregation Questions
- ●Start with your property: the first questions are whether your building type, basis, and hold period make a study worth the fee at all.
- ●Loop in your CPA early: ask how the deduction interacts with your income, passive activity limits, and any future sale before you count on the savings.
- ●Grill the firm on method: a serious provider works from engineering and documentation, and will explain how it classifies components rather than leaning on a fixed percentage.
- ●Ask about bonus timing: the One Big Beautiful Bill restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, so timing questions matter for your year.
- ●Confirm audit defense: ask whether the firm supports its numbers if the IRS asks, and whether that support costs extra.
- ●Seneca answers all of these directly: engineering-based studies to the IRS guide, audit defense included, and a track record of 10,200+ properties assessed without a lost audit.
Questions to Ask About Your Property
Before anything else, figure out whether your building is a good candidate, because a study only makes sense when the numbers support it.
- ●Is my basis large enough? the deduction scales with depreciable basis, so ask whether your property clears the threshold where the fee is easily justified.
- ●How long will I hold it? a longer hold gives the accelerated deduction more time to work before any sale brings recapture into play.
- ●What is my property type? hospitality, retail, industrial, and multifamily buildings carry different mixes of short-life components, which shapes the size of the benefit.
- ●Did I already miss the purchase year? a building you have held for a while can still be studied through a look-back, so an older acquisition does not rule you out.
If you want a quick read on the first question, our page on whether a study is worth it walks through the thresholds where the math starts to make sense.
Questions to Ask Your CPA
A study produces a deduction, and your accountant decides how much of it you can actually use this year. These questions belong in that conversation before you engage a firm.
How Will the Deduction Hit My Return?
The accelerated deduction offsets rental income first, and whether it can reach other income depends on your participation and status. Ask your CPA how the passive activity rules apply to your situation so the savings are not a surprise. Our overview of how these deductions interact with active income is a helpful primer for that talk.
What Happens When I Sell?
Accelerated depreciation can increase depreciation recapture when you sell, so ask your CPA to weigh the year-one benefit against the exit. For owners planning an exchange, the recapture question ties directly into a 1031 exchange and its timeline.
Questions to Ask the Firm You Hire
Here is where the answers tell you the most, because a strong firm welcomes hard questions and a weak one dodges them.
What Methodology Do You Use?
The IRS Cost Segregation Audit Technique Guide treats an engineering approach built on actual cost records as the most reliable, so ask whether the firm works that way. A provider that leans on a fixed percentage or a rule of thumb is a warning sign.
Who Actually Does the Work?
Ask whether engineers perform the analysis and whether the study is reviewed before it goes out. A named reviewer and real engineering staff signal a firm that stands behind the classifications rather than outsourcing them blindly.
Is Audit Defense Included?
Ask directly whether the firm will support its study if the IRS raises a question, and whether that support carries an extra fee. A firm confident in its work usually includes that defense, which is a quiet vote of confidence in the numbers.
How Seneca Answers These Questions
At Seneca, here is how we handle the questions owners bring us, from the first feasibility call through the finished report.
An Honest Feasibility Answer
We tell you up front whether your property is worth studying, including when it is not. That candor saves owners a fee on deals where the deduction would not justify the cost.
Engineering and a Named Reviewer
Our in-house engineers build the study to the standards the IRS guide describes, and every report is peer-reviewed and signed off by our Head of Engineering. You always know who stands behind the classifications.
Defense That Comes Standard
Audit defense is part of every engagement at no extra charge, so if a return is examined we support the numbers we produced. That coverage is included because we build studies we are prepared to defend.
Mistakes Owners Make When Asking Questions
The errors below trip up buyers of studies, and each one is easy to sidestep with a sharper question.
Asking Only About Price
Owners who shop on fee alone often buy a thin study that recovers less and holds up worse. The cheapest report can cost the most if it triggers an adjustment. The fix is to weigh method and defense alongside the quote.
Skipping the CPA Conversation
Commissioning a study without asking how the deduction will be used can leave a large write-off stranded against income you cannot offset. That is a wasted opportunity in the wrong year. The correction is a quick usability check with your accountant first.
Taking Reclassification Percentages at Face Value
A firm that promises a fixed reclassification percentage before seeing your building is guessing. Real numbers come from an engineering look at your specific property. The fix is to ask how the estimate was derived and to discount any figure that arrives without one.
Frequently Asked Questions
These are the questions we hear most from owners in the early stage of considering a study.
Why Owners Bring Their Questions to Seneca
Seneca answers the hard questions with an in-house engineering team, reports peer-reviewed and signed off by our Head of Engineering, and audit defense built into every engagement. Our studies have never lost an IRS audit across more than 10,200 properties assessed. To answer the very first question yourself, our free cost segregation calculator gives you a fast read on the likely benefit.
Conclusion
Good questions are the cheapest due diligence a property owner can do. Ask whether your building fits, ask your CPA how the deduction will land, and ask the firm to explain its method and its defense before you sign anything.
A provider worth hiring will meet those questions with specifics rather than a pitch. The clearer the answers you get, the more confident you can be that the study will pay off and hold up.
When you are ready to put your questions to a real engineering team, run your numbers through the calculator for a quick read, or reach out for a no-commitment estimate and get straight answers about your property.
- IRS Cost Segregation Audit Technique Guide (IRS.gov)
- IRS Publication 946: How to Depreciate Property (IRS.gov)
- One Big Beautiful Bill, P.L. 119-21 (Congress.gov)
- American Society of Cost Segregation Professionals (ASCSP.org)
