Published by Acre Commercial (ACRE)  |  September 2026  |  Spokane, WA

Estimated read time: 6 minutes  |  Category: Investment Analysis

A buyer closed on a 22,000 square foot flex building in Spokane Valley last spring. Then he asked his CPA a fair question. Could he do anything about this year’s tax bill?

The answer turned on a phrase he had heard at a trade night and never quite pinned down. Cost segregation comes up at every real estate meetup here, and it gets more hype than math. Owners get burned in the space between the two.

The idea is simple. The IRS writes off a commercial building over 39 years in equal slices, so the yearly deduction stays small. A cost segregation study sends an engineer through the building to sort its parts, and items that qualify move to a five, seven, or fifteen year life. Since the One Big Beautiful Bill Act brought back 100% bonus depreciation for property bought and placed in service after January 19, 2025, those parts can now be written off in year one.

Acre Commercial works with buyers, owner-users, and builders in Spokane, Spokane Valley, Kennewick, Post Falls, and Rathdrum. We are brokers, so your CPA owns the tax call. This guide gives you enough of the nuts and bolts to have a sharp talk with yours.

What a Cost Segregation Study Does

A cost segregation study starts with a site visit. An engineer walks the building and splits the price into parts. The frame, the slab, the roof, and the outer walls stay on the 39-year clock, while other items drop to shorter lives.

Five-year items often include carpet, wiring that feeds special gear, mood lighting, some plumbing, and partitions you can move. Paving, curbs, site lights, fences, planting, and signs fall into the fifteen-year land group. You will also see fixed furniture and gear tied to the space land on a seven-year clock.

You end up with a split you can defend, backed by photos, build costs, and engineer notes. Quality counts here. The IRS puts out audit guidance on these studies, so a desk job with no site visit draws a hard look. Owners who shop on price alone often buy an audit they cannot win.

Why 100% Bonus Depreciation Changed the Math

Bonus depreciation was fading toward zero before the One Big Beautiful Bill Act brought it back. Property bought and placed in service after January 19, 2025 now earns a full first-year write-off on the parts that qualify.

So a cost segregation study is worth far more than it was. Under the old fade, moving $400,000 of parts gave you a partial boost spread over years. Today that same $400,000 lands in year one.

One wrinkle is worth a talk with your CPA. A full write-off now makes sense when you have income to shelter now. An owner who expects a much bigger year later can elect a smaller bonus rate and hold the deduction. That choice gets made by asset class, so plan before the return goes out.

Which Buildings Pay Off

How much you gain rides on how much of the price sits in short-life parts, and that share swings a lot by building type.

Shops and restaurants

These give up the most. Heavy tenant build-outs, kitchen gear, rich finishes, wide site work, and big parking fields all move well. Say you own a Spokane Valley strip center with acres of paving and rows of site lights. It has far more to work with than a plain office box.

Warehouse and flex

Results here swing wide. A bare shell with a slab and a small yard gives up little, since most of the value sits in the frame. Add heavy power, racking, yard work, truck courts, and process plumbing, and the picture gets much better.

Medical and dental

Few building types give up more. Extra wiring, gas lines, special plumbing, lead shielding, cabinets, and dense finishes push a big share of the price into short-life groups.

The Recapture Catch

A faster write-off cuts your basis. At sale, the parts you moved fall under Section 1245 and come back as ordinary income. That rate runs above the 25% that hits building depreciation under Section 1250.

An owner who holds for thirty years barely feels this. An owner who takes a big year-one deduction and sells in year four can watch recapture eat most of the gain. What you really won was the use of that money for a while. At 7% money, that is worth real cash, though it falls short of a permanent break.

A 1031 exchange rolls recapture forward with the gain. So buyers who trade up again and again keep more of the edge. Anyone who plans a cash sale inside five years should model recapture first.

What a Cost Segregation Study Costs and When It Pays

Cost segregation fees track building size, complexity, and how deep the engineering runs. A small single-tenant box in Post Falls prices well below a multi-tenant medical campus in Spokane.

Get a firm quote and a rough benefit number before you sign. Good firms run a free look first and show what they expect to move, so you can weigh the gain against the fee.

Most CPAs use a rule built on price and your top tax rate together. A buyer in a high bracket with a $2 million building clears the fee with room. An owner in a low bracket with an $800,000 building may not. Passive loss rules add one more catch, since a deduction you cannot use now just sits and waits.

Look-Back Studies on Buildings You Own

Owners who skipped a cost segregation study years ago still have a path. A look-back study finds the write-offs you should have taken, and you claim the whole catch-up this year on Form 3115. There are no amended returns.

This works on buildings bought well before 2025. Still, the bonus treatment of that catch-up rides on the original in-service date, and older buys follow the bonus rules of their day. So hand your CPA the exact dates up front.

Cost Segregation: Common Questions

What is a cost segregation study?

A cost segregation study is an engineering review that splits a building’s price into parts with different write-off clocks. Items that qualify move to five, seven, or fifteen year lives, which covers things like paving, site lights, extra wiring, carpet, and planting. The rest stays on the 39-year clock. Since 100% bonus depreciation applies to property bought and placed in service after January 19, 2025, those moved parts can often be written off in full in year one.

Is a cost segregation study worth it on a small building?

Size matters less than your tax bracket, the building type, and how long you plan to hold. Good firms run a free first look and show how much of the price they expect to move, so you can weigh the gain against the fee. Shops, restaurants, and medical space move a larger share than plain office or a bare warehouse. And a buyer in a low bracket, or one capped by passive loss rules, may watch the deduction sit unused for years.

What is depreciation recapture?

When you sell, the IRS takes back write-offs you claimed. Parts moved to personal property fall under Section 1245 and come back as ordinary income, taxed above the 25% rate that hits the building under Section 1250. So a big year-one deduction on a short hold can leave a stiff bill at sale. A 1031 exchange rolls recapture forward with the gain, so owners who keep trading up hold on to more of the benefit.

Can I do a cost segregation study on a building I bought years ago?

Yes. A look-back study finds write-offs you should have claimed in past years. You take the whole catch-up in the current year on Form 3115, and you file no amended returns. Still, the bonus treatment of that catch-up rides on when the building went into service, since the rules have shifted many times. So hand your CPA the exact purchase and in-service dates at the start.

How Acre Commercial Helps You Weigh a Study at Purchase

Acre Commercial works with buyers, builders, and owner-users in Spokane, Spokane Valley, Kennewick, Post Falls, and Rathdrum. We handle the brokerage, and your CPA handles the tax. What we add is the deal data that makes that talk useful.

Our team pulls detailed building facts at the offer stage. That covers improvement splits, site work scope, past tenant build-outs, and plans where they exist. All of it feeds a first look, so you know before closing whether a study will pay for itself.

We also model hold periods with our clients. Since the value of a fast write-off rides on whether you trade, refinance, or cash out, bring us in early. Then tax stops being an afterthought.

Contact Acre Commercial: 43560.com

Cost segregation is a timing play, and timing is worth a lot when money costs 7%. Pushing tax out ten years while that cash works somewhere else has real value. The return of 100% bonus depreciation made the year-one piece the biggest it has been in years.

Owners who win with it price recapture and hold period next to the deduction. So ask your CPA to run both sides before you order a study.