Detroit’s rebuilt downtown, its industrial base, and a deep stock of multifamily have pulled a wave of investment into the city, and many owners here still depreciate their buildings on the standard 27.5 or 39-year schedule. That default leaves a large first-year deduction unclaimed. This guide is for Detroit and Wayne County owners who want to understand how a cost segregation study changes the math and how Michigan and the city tax the deduction.
As co-founder of Seneca Cost Segregation and a real estate investor myself, I have spent the past two years running engineered studies for owners across the country, and the Detroit market sends us a steady mix of industrial, multifamily, and adaptive-reuse properties. What we see on Michigan buildings is a strong pool of reclassifiable assets sitting under a state that treats bonus depreciation one way for corporations and another for individuals, so the entity matters as much as the building.
The sections below explain how a study works on a Detroit property, which local building types reclassify best, how Michigan handles the deduction, and what first-year federal savings tend to look like. I wrote it so Michigan owners can weigh the opportunity before they meet with their CPA.
TL;DR — Cost Segregation in Detroit, Federal and State
- ●A $2,000,000 Detroit property can free up roughly $118,000 to $178,000 in first-year federal tax savings: a study reclassifies 20 to 30 percent of depreciable basis onto 5, 7, and 15-year schedules, and federal bonus depreciation writes it off at once.
- ●Michigan splits bonus depreciation by entity: the corporate income tax allows no bonus, while individuals and pass-throughs follow the older phased-down federal bonus rather than the permanent 100 percent.
- ●The reclassified assets still accelerate for Michigan: 5, 7, and 15-year property depreciates far faster than the 39-year shell, even where the state bonus is reduced or added back.
- ●Detroit levies a city income tax on top of Michigan’s 4.25 percent: 2.4 percent for residents and 1.2 percent for nonresidents, so the local layer belongs in your planning.
- ●Federal bonus depreciation stays at a permanent 100 percent for property acquired after January 19, 2025: the One Big Beautiful Bill locked full first-year federal expensing into law.
- ●Own an older Detroit building? A lookback study still reaches it: Form 3115 captures the missed depreciation as a single catch-up, with no amended returns.
How Cost Segregation Works on a Detroit Property
A cost segregation study identifies the building components that qualify for faster depreciation and reassigns them.
Without a study, the tax code depreciates the whole building over one life, 39 years for commercial or 27.5 for residential rental. An engineered study separates the personal property and land improvements that carry shorter lives and moves those deductions forward. The frame, foundation, and roof structure stay on the long schedule. The components that serve how the building is used are the ones eligible to move.
The table lays out standard recovery against the accelerated schedules for assets common to a Detroit building. This same approach sits behind our commercial cost segregation studies.
Detroit Building Types That Reclassify Best
The buildings driving Detroit’s comeback tend to hold plenty to reclassify.
Industrial and supplier facilities across Wayne County carry heavy electrical service, process equipment, and paved yards. Downtown and Midtown apartments, many of them conversions of older office and commercial stock, add appliances, cabinetry, and amenity build-out, where a residential rental study usually finds a large short-life share.
Adaptive-reuse projects are a Detroit specialty, and a gut renovation resets much of a building’s cost into new, shorter-lived components. The heavier the build-out, the more a study tends to move onto accelerated schedules.
How Michigan Handles the Deduction
The federal deduction lands in full, and Michigan treats the bonus differently depending on how you hold the property.
The Corporate and Individual Split
Michigan’s corporate income tax does not allow bonus depreciation, so a C corporation adds the federal bonus back and depreciates on the regular schedules, according to the Michigan Department of Treasury. Individuals and pass-through owners follow federal bonus depreciation under the Internal Revenue Code as of December 31, 2024, which carries a phase-down of 40 percent for 2025 and less in later years rather than the permanent 100 percent.
The reclassified components still shift onto the shorter 5, 7, and 15-year lives for Michigan, so a study accelerates the state deduction even where the bonus is reduced. A Detroit owner claims the full federal bonus depreciation now and follows the Michigan rule that fits the entity.
The Detroit City Income Tax
Detroit adds a city income tax on top of the state, at 2.4 percent for residents and 1.2 percent for nonresidents. How a depreciation deduction interacts with the city return depends on your residency and filing situation, so treat the city layer as a separate line to plan around with your accountant.
First-Year Federal Savings for Detroit Owners
The estimates below reflect the federal first-year deduction, since the Michigan and Detroit treatment varies by entity and residency.
Every row removes land, assumes 20 to 30 percent of the depreciable basis moves to shorter schedules, and applies full federal bonus depreciation in year one. The savings figures assume a 37 percent federal bracket. The Michigan and city benefits sit on top of this and depend on your specific situation, so they stay out of the year-one figures.
For most commercial buildings the study fee is a small fraction of those totals, and typical ranges appear on our page covering cost segregation study fees. To watch the reclassification play out on an actual building, review a worked study example.
How a Seneca Study Comes Together
At Seneca, here is how a study on a Detroit property runs from first call to filing.
Feasibility Estimate
We take your purchase price, placed-in-service date, and building type and project the reclassification range and first-year deduction. That estimate shows whether the study earns its fee before you spend anything.
Records and Site Work
We gather the closing statement, appraisal, and any construction or renovation records, then inspect the property on site or through a guided video tour. Our engineers measure and document each qualifying component instead of leaning on a generic percentage.
Report and CPA Coordination
You receive an engineered report that assigns and supports each asset, carrying our Head of Engineering’s sign-off. Your CPA files from the schedule, handling the Michigan entity treatment, and we stay reachable through filing. Standard studies wrap in 10 to 15 business days.
Mistakes Detroit Owners Should Avoid
A few recurring errors shrink what Detroit owners keep.
- ●Assuming the full 100 percent bonus flows to the state. Michigan corporations get no bonus and individuals follow the phased-down federal amount, so a projection that copies the federal write-off onto the state return overstates the benefit. Build the Michigan schedule to the entity.
- ●Forgetting the Detroit city layer. The city income tax is easy to leave out of a projection. Fold it in early so the after-tax picture reflects state and local together.
- ●Overlooking a renovation basis. Adaptive-reuse and gut rehabs create fresh short-lived assets that reclassify well, and owners who skip a study on a renovated building leave that deduction behind. Run the numbers after major work.
- ●Accepting a rule-of-thumb study. Desktop and sampling methods raise audit exposure and undercount the reclassification. An engineered study grounded in inspection holds up when the return is examined.
Choosing a Cost Segregation Provider in Detroit
Judge a provider on method and on the support that follows the report.
- ●Engineering-based method: the study should be built from a physical inspection and measured components, following the IRS Cost Segregation Audit Technique Guide.
- ●Audit defense included: a firm that stands behind its report at no added cost is signaling confidence in the work.
- ●Clean CPA handoff: the schedule should drop into your return, Michigan entity treatment included, with the firm reachable through filing.
- ●Michigan and Detroit fluency: the provider should reflect the corporate-versus-individual split and the city income tax so your projection is realistic.
Seneca grounds every study in a physical inspection instead of a desktop guess. Our Head of Engineering reviews and signs each report, every client gets a dedicated project manager, and audit defense comes standard at no separate charge. Through more than 10,200 studies, we have never lost an IRS audit.
Frequently Asked Questions
Here are the questions Detroit owners raise most as they size up a study.
Conclusion
Detroit’s mix of industrial, multifamily, and adaptive-reuse buildings is exactly the kind of stock that reclassifies well, and the federal rules reward owners who accelerate it. A study carves out the 20 to 30 percent of basis that belongs on faster schedules, and permanent federal bonus depreciation writes it off in year one for property acquired after January 19, 2025.
Michigan asks for care on the state side. The corporate return allows no bonus, individuals follow a phased-down amount, and Detroit adds a city income tax, so the state and local picture depends on your structure.
If you own or are buying a Detroit property, a feasibility estimate will map the numbers to your building. Run the calculator or reach out for a preliminary review, and bring your CPA in early on the Michigan and city treatment.
- 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)
- Michigan Tax Rates and Rankings (Tax Foundation)
- Michigan Treasury: City of Detroit Individual Income Tax (michigan.gov)
