Cost Segregation Study in North Dakota for Airbnb and Short-Term Rental Investors

North Dakota Century Code chapter 57-38 defines an individual's North Dakota taxable income by reference to federal taxable income computed under the Internal Revenue Code "as amended," which is a rolling conformity structure rather than a fixed, date-specific one. Per Tax Foundation's July 2025 OBBBA State Conformity guide, North Dakota conforms to IRC §168(k) (bonus depreciation), §168(n), §174, and §179 for both personal and corporate income tax, and it does so automatically as federal law changes — no separate conformity bill is required to pick up the OBBBA's restored 100% bonus depreciation. As of this writing, no bulletin, FAQ, or instruction booklet from the North Dakota Office of State Tax Commissioner specifically addressing OBBBA bonus depreciation conformity for tax year 2025 has been identified, so investors should confirm current-year treatment with the Tax Commissioner's office or a CPA before relying on this for a specific filing. That posture is still meaningfully different from states that require an add-back of federal bonus depreciation followed by a multi-year spread-out recovery; because North Dakota's individual income tax starts from federal taxable income, which already reflects the depreciation deduction whether or not the owner itemizes on a federal return, a cost segregation study's first-year federal deduction generally reduces state taxable income in the same year it reduces federal taxable income.

North Dakota does still levy its own individual income tax — a relatively low, three-bracket schedule of 0%, 1.95%, and a top marginal rate of 2.50%, per the North Dakota Office of State Tax Commissioner's published brackets for the current tax year — so the state-level benefit of accelerated depreciation, while real, is smaller in dollar terms than the federal benefit.

Property taxes are handled separately: North Dakota's average effective property tax rate runs close to 1% of market value, modestly above the national average based on Tax Foundation and SmartAsset data, which makes annual carrying costs on rental property an additional line item worth planning around even after a cost segregation study reduces income tax exposure.

For investors weighing whether a study is worth commissioning, the combination matters: a state that does not erase or defer the federal bonus depreciation benefit, layered on real, resilient short-term-rental demand around the Bakken energy corridor, Theodore Roosevelt National Park, and the state's handful of lake and university markets, is a stronger setup than a state that decouples from bonus depreciation entirely.

The IRS default for a residential rental building is to depreciate its full cost, minus land value, on a straight line over 27.5 years; commercial buildings depreciate over 39 years. That default treats a roof, a parking pad, cabinetry, and HVAC ductwork all as if they wear out at the same rate as the structural frame, which is not how a licensed engineer would describe the building. A cost segregation study uses an engineering-based analysis — often including a site visit, construction documents, and cost records — to separate a property's components into IRS-recognized shorter-life categories: 5-year property (appliances, certain flooring and furnishings), 7-year property (some furniture and equipment), and 15-year land improvements (site grading, exterior lighting, fencing, parking areas, and landscaping).

Once those components are identified and their cost basis is reclassified, they qualify for accelerated depreciation instead of riding along on the 27.5- or 39-year schedule. The One Big Beautiful Bill Act, signed into law in July 2025, permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025 — generally meaning property acquired under a binding written contract entered into after that date. Placed-in-service timing is a separate, additional requirement: components with a recovery period of 20 years or less that meet the acquisition-date test, and that are also placed in service in the applicable tax year, can generally be deducted in full in that year rather than depreciated gradually. The net effect is that a much larger share of a qualifying property's cost basis becomes deductible in year one, rather than trickling out over multiple decades.

For illustration only — your results depend on your property and tax situation, and this is not a projection of actual savings.

Suppose an investor buys a furnished cabin-style short-term rental near Medora, the gateway town to Theodore Roosevelt National Park, for $600,000, with $100,000 allocated to land and $500,000 to the building and its contents. A cost segregation study might identify roughly 25%–30% of that $500,000 building basis — call it $135,000, covering furnishings, appliances, decking, exterior lighting, and site work — as 5-, 7-, or 15-year property rather than 27.5-year residential real property. Under 100% bonus depreciation for qualifying property acquired after January 19, 2025 (and placed in service accordingly), that entire $135,000 could potentially be deducted in the first year, instead of roughly $4,900 a year if the building were depreciated on the standard 27.5-year schedule alone. The actual percentage identified, and the resulting tax benefit, will vary by property, purchase price, and each investor's own tax position — a study quantifies the real number for a specific property.

Cost segregation is not limited to the year of purchase. If you have owned a North Dakota rental for one year or several, a "look-back" study can still capture the accelerated depreciation you missed in prior years. Rather than filing amended returns for every year the property has been in service, the study supports a Form 3115, Application for Change in Accounting Method, which allows the accumulated difference between what was actually depreciated and what should have been depreciated under proper component classification to be claimed as a single Section 481(a) catch-up adjustment in the current tax year. For an investor who bought a Fargo duplex or a Bismarck long-term rental several years ago and never had the components reclassified, this can convert years of underused depreciation into one meaningful current-year deduction, without reopening old tax filings.

• Short-term rental and cabin owners near Theodore Roosevelt National Park in Medora, Dickinson, and Belfield, where visitor demand concentrates heavily in the summer season
• Lake and outdoor-recreation rental owners around Devils Lake, a major regional walleye and ice-fishing destination with a dense cluster of cabin and lodging rentals
• Corporate and workforce housing investors in the Bakken oil corridor, including Watford City, Williston, and Dickinson, where rental demand is tied to energy-sector activity
• Long-term rental and multifamily owners in Fargo, Bismarck, Grand Forks, and Minot, North Dakota's largest population and university centers
• Recent buyers or renovators of rental property acquired after January 19, 2025 — generally meaning under a binding written contract entered into after that date — and placed in service accordingly, who want to capture 100% bonus depreciation on qualifying components
• High-income owners evaluating the short-term rental material participation strategy, which can allow active losses from a qualifying STR to offset other ordinary income when material participation and average-stay tests are met