Five Questions to Frame the Decision

People often approach cost segregation with a swirl of half-remembered claims. A short list of questions can cut through it. Answer these five in writing, in order, and you will usually know whether to pursue a study, pause, or pass.

Question 1: What is the building basis?

Start with what you paid or built, then subtract land. The remainder is the depreciable basis that a study can reclassify. If you do not know the land value, look at the property tax assessment ratio as a rough clue, a prior appraisal, or the purchase allocation in your closing documents. The page Land Versus Building Allocation and Why It Comes First covers approaches. This number frames scale: it tells you whether the decision is large or small.

Question 2: Can I use the deductions soon?

This question is often skipped and often decisive. Are you a real estate professional, a materially participating short-term rental owner, an active owner with passive income to absorb losses, or someone whose losses would be suspended? Read The Passive Activity Loss Rules and Cost Segregation, Material Participation Tests in Plain Language, and Real Estate Professional Status and Study Decisions and write down which bucket you are in. If the honest answer is "I do not know", that itself is the most valuable finding, and you should resolve it before anything else.

Question 3: When do I expect to exit?

Think in three windows: sale within a couple of years, sale in the middle years, and long hold or never. Early exits shrink the net advantage because accelerated deductions may be recaptured. Long holds tend to favor the timing shift. Read Hold Period and the Decision and Depreciation Recapture on Sale: What Comes Back for how the trade works.

Question 4: What will it cost and how good is the work?

Get a written scope and fee. Ask whether the work includes a site inspection, whether an engineer is involved, what the deliverable looks like, and what support is provided if questions arise later. See Cost Segregation Study Fees: General Ranges, Engineering-Based Versus Software-Only Studies, and How to Vet a Cost Segregation Provider. A low fee for weak work is not a bargain if the work does not hold up.

Question 5: What is my timing and method?

Did you place the property in service this year, or years ago? A current-year study is often reported with the return. A study for a prior year may involve Form 3115 and a catch-up adjustment. See Year of Acquisition: Why Timing Matters for a Study and Catch-Up Depreciation With Form 3115. Knowing which path you are on shapes cost, paperwork, and deadlines.

Turning answers into a result

This table is a thinking aid, not a rule. Individual facts can move you across rows.

Common traps

Two traps show up often. The first is treating a calculator estimate as a forecast. Estimates depend on assumptions about what portion of a building shifts, and that portion is only known after analysis. The second is skipping question 2 because the savings figure looks exciting. An exciting figure attached to unusable deductions is not a benefit yet.

What to do with the answers

Bring your five written answers to your tax preparer. They will save time and make the conversation more concrete. If you would like an outside perspective, a discovery call with AE Tax Advisors can cover the same ground. Then move on to the Cost Segregation Decision Checklist for a fuller review, or to Questions to Ask Your CPA Before Ordering a Study for a list of things to ask.

Worked prompts for each question

For the first question, write a sentence such as "I paid X, and I estimate land at Y based on Z." Naming the source keeps you honest. For the second, write "I believe my losses from this property are passive, active, or nonpassive because of these facts." For the third, write "I expect to hold at least N years unless these events happen." For the fourth, write "I have received these quotes and I have or have not seen a sample report." For the fifth, write "The property was placed in service on this date, so the path is a current-year study or a catch-up."

Who should answer what

Some of these answers come from you, such as your plans and hours. Some come from documents, such as the closing statement. Some come from your preparer, such as the usability analysis. If you do not know who should answer a question, that is a sign to ask. A single conversation with your preparer can usually resolve all five if you arrive prepared.

What a "not yet" looks like in practice

Suppose you complete the five questions and find that question two is unresolved. You do not yet know whether your losses would be usable. The right move is not to guess. It is to resolve question two, perhaps by asking your preparer to run a projection with and without the additional deduction. When you have that, return to the other questions.

Using the questions repeatedly

The five questions are reusable. When you buy a new property, run them again. When your income or role changes, run them again. When the law changes, run them again. Keeping your answers in a single note makes each review faster.

A reminder on law and facts

Everything above depends on rules that change and on facts specific to you. Where this site refers to current rules, it does so with caution, and you should confirm any point that drives a decision.