Cost Segregation Study Checklist: What You Need to Gather

The one document that starts everything

For a property being purchased now, the closing statement (the settlement statement from the transaction) establishes the purchase price and the allocation between land and building, the starting point for every classification decision that follows. For a property already owned, the current depreciation schedule from the most recent tax return serves the same purpose: it shows the building's basis, the in-service date, and what has already been depreciated.

That single document is genuinely enough to begin. Everything else on this list either does not apply to every property or gets handled by the engineering team rather than the owner.

If renovations happened after purchase: improvement invoices

Any capital improvement made after the original purchase, a new roof, a kitchen buildout, a parking lot repaving, has its own depreciable basis separate from the original building. Invoices for that work let the study classify the improvement itself, not just the property as it stood at purchase. If a roof was replaced, that also opens the door to a partial asset disposition, writing off the remaining basis of the old roof in the year of replacement, but only in that specific tax year. Miss the year and the old roof's basis stays buried in the building for decades while the new roof depreciates on top of it.

If no improvements happened, this item simply does not apply. Nothing to gather. And if invoices from an old renovation were lost, that is worth flagging to the engineering team rather than assuming the improvement has to be left out of the study entirely; alternative documentation can sometimes substitute.

For a short-term rental: photos instead of a site visit

A residential short-term rental does not need an inspector to walk the property. The listing photos already on Airbnb or VRBO document flooring, cabinetry, appliances, lighting, furniture, and outdoor features in enough detail for component classification. That means the checklist for an STR owner is shorter than for commercial property: the depreciation schedule or closing statement, plus access to the existing listing photos. No new photography, no scheduling an inspector around guest turnovers.

If the listing has changed significantly since it was first photographed, a new furniture set, a renovated kitchen, more recent photos help the classification reflect the property as it actually stands today rather than an outdated listing. Beyond that, there is nothing extra to prepare specifically for the photo review step.

For commercial property: access for a site visit or plans

Commercial property, unlike a residential short-term rental, generally does require either a site visit or a detailed set of building plans, since the mix of specialized equipment, buildout, and site improvements on a commercial building is harder to classify from photos alone. That means one more item on the checklist: coordinating access for a walkthrough, or providing architectural and construction plans if a physical visit is not practical. Either path works; the goal is giving the engineering team enough visibility into the actual components to classify them accurately.

What happens once the documents are in

After the owner hands over the one or two documents above, the process moves to the engineering team. Construction cost data, comparable pricing, and the actual classification work all happen without further input from the owner in most cases. Turnaround from that point typically runs 4 to 6 weeks in peak tax season, and 2 to 3 weeks in January and February when volume is lower. The owner's checklist essentially ends once those documents are submitted; the remaining work belongs to the specialist team producing the report and, for a look-back study, the section 481(a) computation that goes to the CPA.

What the owner does NOT need to gather

For a property owned for years, a look-back study runs through Form 3115 (automatic consent) with a section 481(a) catch-up deduction in the current tax year. No amended returns for prior years are required, and no owner-side reconstruction of past depreciation is needed. The specialist team calculates the catch-up; the CPA files it.

A worked example: what the checklist produced on a mid-rise office

On a delivered mid-rise office study, the owner provided a closing statement and a set of improvement invoices for a lobby renovation completed two years after purchase. The building basis totaled $2,971,345, and the resulting study identified $479,220 in first-year deductions for a $12,000 fee, a 39.9 to 1 ratio. The checklist on that property was two documents: the closing statement and the renovation invoices. Everything else, the site review, the classification, the section 481(a) computation, was the engineering team's work.

Quick reference by property type

The pattern across every row is the same: one core financial document, plus renovation invoices only if they apply, plus a site visit only for commercial property. Nothing on this table requires the owner to reconstruct years of records.

Starting the process

The 60-second qualifier at /qualify is the actual first step, before any document collection. It produces a free Preliminary Benefit Estimate based on basic property information, so the owner sees a projected number before deciding whether the study is worth running. The document checklist above only comes into play once that decision is made.

Frequently asked questions

Do I need a closing statement AND a depreciation schedule?

No, just one, whichever applies. A closing statement covers a property being purchased now. A current depreciation schedule from the most recent tax return covers a property already owned. They serve the same role: establishing basis and in-service date.

What if I don't have improvement invoices from years ago?

Improvement invoices only matter if capital improvements happened after purchase. If none did, that item does not apply. If invoices are missing for improvements that did happen, ask the specialist team what alternative documentation can substitute.

Does a short-term rental really not need a site visit?

Correct, for most residential short-term rentals. The listing photos already on the booking platform document the property's components in enough detail for classification without an inspector visiting.

Do I need to gather records going back to when I bought the property?

No. A look-back study is claimed through Form 3115 with a section 481(a) catch-up in the current year, which does not require amended returns or the owner reconstructing years of past depreciation records.

What's the very first step before gathering any documents?

A free 60-second qualifier at /qualify, which produces a Preliminary Benefit Estimate from basic property information. Document collection happens after that estimate, once the decision to proceed is made.