Free Depreciation Calculator (2026)
Straight-line rental property depreciation schedule. Calculate instantly — no signup required. Updated for 2026.
What Is a Depreciation Calculator?
A depreciation calculator is a specialized real estate tax-planning tool designed to calculate the straight-line depreciation deduction for a residential or commercial rental property under IRS guidelines. Depreciation is one of the most powerful tax benefits of real estate investing. It is a non-cash paper write-off that allows property owners to deduct the cost of the building and physical improvements from their rental income annually, accounting for the natural wear and tear of the property over time.
The IRS assigns a specific useful lifespan to real estate: **27.5 years** for residential rental properties and **39 years** for commercial properties. The key rule is that you can only depreciate the value of the physical structure and improvements; **land value is never depreciable** because land does not wear out. Our depreciation calculator helps you isolate your depreciable basis and generate your annual deduction schedule, helping you legally minimize your rental income tax liability.
How to Use This Depreciation Calculator
To generate your property depreciation schedule, enter these details:
- Property Purchase Price: The gross purchase price of the real estate.
- Land Value / Allocation (%): The portion of the purchase price allocated to the land (typically 10% to 20%). This can be found on your county tax assessor bill or appraisal report.
- Property Type: Select Residential (27.5-year lifespan) or Commercial (39-year lifespan).
The calculator instantly processes the variables, isolating your depreciable building basis and showing your annual write-off amount.
The Straight-Line Depreciation Formulas
First, the Depreciable Building Basis (B_dep) is isolated by subtracting the land value:
B_dep = Property Purchase Price × (1 − Land Allocation %)
Next, the Annual Depreciation Deduction (D_annual) is calculated based on property type:
For Residential: D_annual = B_dep / 27.5
For Commercial: D_annual = B_dep / 39
Step-by-Step Practical Example
Let’s calculate the annual tax deduction for a residential rental home purchase:
- Property Purchase Price: $250,000
- Land Allocation: 15% (Land Value: $37,500, non-depreciable)
- Property Type: Residential (27.5 years)
Step 1: Isolate the Depreciable Building Basis (B_dep)
B_dep = $250,000 × (1 − 0.15) = $250,000 × 0.85 = $212,500
Step 2: Apply the residential depreciation lifespan
Annual Deduction = $212,500 / 27.5 ≈ $7,727.27 per year
Step 3: Analyze the tax savings
Every year for 27.5 years, you can write off $7,727.27 against your rental income. If your property generated $10,000 in net rental cash flow, you only pay income tax on $10,000 − $7,727.27 = $2,272.73, saving you thousands of dollars in taxes while you pocket the cash.
Key Takeaways
- Depreciation is a powerful non-cash tax deduction that offsets taxable rental income.
- Land is never depreciable; you must subtract land value to find your building basis.
- Residential property is depreciated over 27.5 years; commercial over 39 years.
Frequently Asked Questions
Why is land excluded from real estate depreciation?
Land is permanently excluded from depreciation because land does not degrade, wear out, or lose its utility over time under tax law. Only the physical building structure and improvements (like roofs, paving, or plumbing) degrade and have a finite useful lifespan, making them eligible for the depreciation write-off.
What is Depreciation Recapture Tax and when does it apply?
Depreciation recapture is a tax levied by the IRS when you sell a depreciated investment property for a profit. The IRS "recaptures" the cumulative depreciation deductions you claimed (or could have claimed) during your ownership and taxes that portion at a flat rate of up to 25%, preventing investors from double-dipping on tax breaks.
How can I determine the land allocation percentage for my property?
You can determine your land allocation percentage by: 1) Checking your local county tax assessor’s property tax card, which separates land value from improvement value. 2) Reviewing a professional appraisal report. 3) Utilizing a standard market allocation (such as assigning 15% to 20% to land) if local tax data is unavailable.
What is the Mid-Month Convention in real estate depreciation?
The Mid-Month Convention is an IRS tax rule stating that regardless of which day of the month you place a rental property into service (e.g., May 2nd or May 28th), the property is treated as having been placed in service exactly in the middle of that month, granting you a half-month of depreciation for your first tax year.
Does depreciation reduce the cost basis of my property?
Yes. Claiming annual depreciation deductions directly reduces your property’s adjusted cost basis. For example, if you buy a building for $200,000 and claim $20,000 in cumulative depreciation, your adjusted cost basis drops to $180,000. When you sell the property, your taxable capital gain will be calculated from this lower $180,000 basis.