Depreciation in real estate lets you deduct the cost of a building that may be growing in value at the same time, and the mechanics behind that, especially since bonus depreciation became permanent, are worth understanding in real detail.
What's Inside
Depreciation in real estate is one of the strongest ongoing tax advantages available to property owners, letting you deduct the theoretical wear and tear on a building even while its market value climbs. This builds on the mechanics touched on in real estate tax deductions every investor should know, capital gains tax on real estate, and 1031 exchange explained with the full, specific treatment.
Quick honesty note
This is education, not tax advice. Specific dollar figures in the worked example below are illustrative. Consult a licensed tax professional, and a qualified cost segregation specialist if pursuing that strategy, before making decisions based on this article.
The Short Answer
The Basic Schedule, and How Buildings Get Classified
Residential rental property depreciates on a straight-line basis over 27.5 years; nonresidential, or commercial, property depreciates over 39 years, both using a mid-month convention that prorates the first year's deduction based on which month the property was actually placed in service rather than assuming a full year regardless of purchase date.
Classification isn't just about property type
A building counts as residential for depreciation purposes only if 80% or more of its gross rental income comes from dwelling units; a mixed-use building that fails this test uses the 39-year commercial schedule instead. Short-term rentals with an average stay of seven days or less are generally treated as nonresidential property for this purpose, using the 39-year schedule rather than the 27.5-year residential one, a distinction that surprises many short-term rental owners who assume residential treatment automatically applies.
Land Never Depreciates, and the Allocation Mistake
Land is never depreciable, because unlike a building, it doesn't wear out or lose useful life over time. This means your depreciable basis is your purchase price minus whatever portion is properly allocated to land, not the full purchase price. Consider a $1,200,000 commercial property purchase with $200,000 allocated to land: your depreciable basis is $1,000,000, not $1,200,000, and getting this allocation right at the outset is exactly where a lot of quick, back-of-napkin depreciation math falls apart before it even starts.
Bonus Depreciation, Now Permanent, With One Big Limit
Bonus depreciation allows the full cost of qualifying property to be deducted in the year it's placed in service rather than spread across its full recovery period, and recent legislation permanently restored the rate to 100% for qualifying property acquired and placed in service after January 19, 2025, reversing an earlier scheduled phase-down toward zero.
The building itself still doesn't qualify
Bonus depreciation only applies to property with a recovery period of 20 years or less, it does not apply to the 27.5-year residential building or 39-year commercial building structure itself. This is a commonly misunderstood limitation: permanent 100% bonus depreciation does not mean you can immediately expense an entire building purchase. It means the shorter-life components within that building, identified through a cost segregation study, can be.
Cost Segregation, Correctly Understood
A cost segregation study identifies specific building components, certain electrical and plumbing elements, carpeting, specialized equipment, land improvements like paving or landscaping, that genuinely have shorter useful lives than the building structure around them, and reclassifies them into 5, 7, or 15-year recovery categories instead of the default 27.5 or 39-year schedule. Many studies identify roughly 20% to 35% of a property's purchase price as belonging in these shorter categories. Because these reclassified components generally fall within the 20-year-or-less recovery period bonus depreciation requires, pairing a cost segregation study with 100% bonus depreciation lets a meaningful share of a property's cost be deducted in year one rather than trickling out over decades.
A Full Worked Example
Take a $1,200,000 commercial property purchase, with $200,000 properly allocated to land, leaving a $1,000,000 depreciable basis. Without a cost segregation study, that full amount depreciates straight-line over 39 years, roughly $25,641 per year in steady-state depreciation. With a study that reclassifies $250,000, say $150,000 into 5-year personal property and $100,000 into 15-year land improvements, both categories generally qualify for 100% bonus depreciation, meaning that entire $250,000 could be deducted in year one. The remaining $750,000 of building shell continues depreciating over the standard 39-year schedule, around $19,231 per year.
Common Mistakes (and How to Dodge Them)
- Depreciating the full purchase price including land. Land is never depreciable; only the properly allocated building portion qualifies.
- Assuming a short-term rental automatically gets the 27.5-year residential schedule. Properties with an average stay of seven days or less are generally treated as nonresidential, using the 39-year schedule instead.
- Believing permanent bonus depreciation lets you expense an entire building immediately. Only components with a recovery period of 20 years or less qualify; the building structure itself never does.
- Skipping a cost segregation study on the assumption it's only for very large properties. Many mid-size properties still see meaningful reclassification percentages worth evaluating.
- Treating cost segregation as an aggressive or risky strategy. It's a correction to the default classification, not a loophole, provided the study is properly documented.
Frequently Asked Questions
How long does residential rental property take to depreciate?
27.5 years, using a straight-line method with a mid-month convention that prorates the first year based on when the property was placed in service.
Why can't I depreciate the land my rental property sits on?
Land is never depreciable because it doesn't wear out or lose useful life over time, unlike the building on it. Only the properly allocated building portion of your purchase price is depreciable.
Does a short-term rental use the same depreciation schedule as a long-term rental?
Not necessarily. Short-term rentals with an average stay of seven days or less are generally treated as nonresidential property, using the 39-year schedule rather than the 27.5-year residential schedule.
Does permanent 100% bonus depreciation let me deduct my entire building in year one?
No. Bonus depreciation only applies to components with a recovery period of 20 years or less. The building structure itself, on its 27.5 or 39-year schedule, doesn't qualify.
What does a cost segregation study actually do?
It identifies specific building components that genuinely have shorter useful lives than the overall structure and reclassifies them into faster depreciation categories, correcting a default classification rather than creating a new deduction out of nothing.
How much of a property's cost can typically be reclassified through cost segregation?
Many studies identify roughly 20% to 35% of purchase price as belonging in shorter-life categories, though actual results depend on the specific property type and require a qualified study to confirm.
Depreciation Rewards Getting the Details Right
Depreciation in real estate is a genuinely powerful, ongoing tax advantage, but the value depends entirely on getting the mechanics right: the correct schedule for your property type, an accurate land allocation, a clear understanding of what bonus depreciation actually covers, and, where it makes sense, a properly documented cost segregation study. None of this is a shortcut around paying tax eventually, but understood correctly, it's one of the most consequential advantages real estate offers over almost any other asset class.
This closes out the Taxes, Legal & Protection cluster, covering LLC formation, 1031 exchanges, tax deductions, asset protection, the LLC decision, capital gains, accounting software, and now depreciation. Each piece stands alone, but together they cover the financial and legal architecture that protects everything else you build.
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Keep learning: real estate tax deductions every investor should know · capital gains tax on real estate · 1031 exchange explained · real estate taxes and legal protection.
Education only, not tax advice. Specific dollar figures in the worked example are illustrative; depreciation rules and bonus depreciation status can change with tax legislation. Consult a licensed tax professional and, for cost segregation, a qualified specialist before making decisions.
Written by
Nwaeze David
Nigerian digital entrepreneur, educator and author of three real estate books. He writes practical, honest guides for new investors, working realtors and Africans building back home from abroad.
