Straight Line vs Accelerated Depreciation: Which One Actually Saves More
Straight line depreciation deducts an equal amount every year over an asset's recovery period. Accelerated depreciation front loads the deduction into the early years. Both methods deduct exactly the same total dollars over the life of the asset. The difference is entirely about timing, and timing is worth real money because a dollar deducted today is worth more than a dollar deducted in year twenty.
The Core Difference in One Table
A $100,000 asset with a five year recovery period:
| Year | Straight line | 200% declining balance (MACRS) | 100% bonus depreciation |
|---|---|---|---|
| 1 | $10,000 | $20,000 | $100,000 |
| 2 | $20,000 | $32,000 | $0 |
| 3 | $20,000 | $19,200 | $0 |
| 4 | $20,000 | $11,520 | $0 |
| 5 | $20,000 | $11,520 | $0 |
| 6 | $10,000 | $5,760 | $0 |
| Total | $100,000 | $100,000 | $100,000 |
Every column totals $100,000. The straight line and declining balance columns both reflect the half year convention, which is why year one is half of a full year and the schedule runs into a sixth year.
Why Timing Is Worth Money
At a 37 percent marginal rate, the $100,000 deduction is worth $37,000 of tax either way. But the present value differs. Discounted at 8 percent:
| Method | Nominal tax benefit | Present value at 8% | Difference |
|---|---|---|---|
| Straight line | $37,000 | ~$30,700 | baseline |
| 200% declining balance | $37,000 | ~$32,700 | +$2,000 |
| 100% bonus, year one | $37,000 | $37,000 | +$6,300 |
Scale that to a real estate acquisition. On a property where cost segregation moves $500,000 from a 27.5 year schedule to immediate expensing, the present value gain runs well into six figures. That, and nothing else, is the argument for accelerating depreciation.
Which Method Applies to What
You generally do not choose freely. MACRS assigns a method by property class:
| Property | Required method |
|---|---|
| 3, 5, 7, 10 year property | 200% declining balance, switching to straight line |
| 15, 20 year property | 150% declining balance, switching to straight line |
| Residential rental buildings (27.5 yr) | Straight line, mid month |
| Nonresidential buildings (39 yr) | Straight line, mid month |
| Anything under ADS | Straight line, longer life |
Note what this means for real estate: the building is always straight line. You cannot accelerate the structure. The only way to get accelerated treatment on real estate is to correctly identify the portions of the purchase that are not building, which is what a component study does.
The "switching to straight line" language matters too. Declining balance automatically converts to straight line in the year that produces a larger deduction. That crossover is already baked into the MACRS percentage tables.
When Straight Line Is the Better Answer
Accelerating is not automatically correct. Situations where slower is better:
- You are in a low bracket now and expect a higher one later. A deduction at 22 percent today is worth less than the same deduction at 37 percent in four years. Early stage businesses and investors in a transition year should run the comparison.
- The loss would be suspended anyway. If passive activity rules under Section 469 park the loss on a carryforward schedule, accelerating produces a bigger suspended number and no current cash benefit. See passive activity loss rules.
- Excess business loss limits bite. Section 461(l) caps how much business loss a noncorporate taxpayer can use against nonbusiness income. Beyond the cap, the excess converts to an NOL carryforward.
- You want to preserve QBI. Depreciation reduces qualified business income and can shrink the Section 199A deduction. See our QBI deduction guide.
- You plan to sell soon. A short hold means recapture arrives quickly and the deferral window is too narrow to matter, especially on 1245 property recaptured at ordinary rates.
- You need income on paper. Loan covenants, a pending sale, or a mortgage application can make reported income more valuable than a tax deduction.
How to Slow Depreciation Down Deliberately
If straight line is the better answer, you have three levers:
- Elect out of bonus depreciation under Section 168(k)(7). Applies to an entire asset class for the year.
- Elect the straight line method within MACRS under Section 168(b)(5), keeping the normal recovery period but spreading evenly.
- Elect ADS under Section 168(g)(7), which lengthens the recovery period as well.
All three are made on a timely filed return, including extensions, and are generally irrevocable. This is a decision to make deliberately, not one to discover after the fact.
The Practical Answer for Most Real Estate Investors
If you are a high bracket taxpayer who can actually use the loss this year, accelerate. The present value advantage is large and the recapture cost arrives years later in dollars that have already been put to work.
If the loss will be suspended because you cannot clear the passive activity hurdle, the honest answer is that a study buys you a bigger carryforward, not a refund. Solve the participation question first, through the short term rental exception or real estate professional status, and then accelerate.
Frequently Asked Questions
What is the difference between straight line and accelerated depreciation?
Straight line depreciation deducts the same amount every year across the recovery period. Accelerated depreciation, such as the 200 percent or 150 percent declining balance methods used in MACRS, deducts more in the early years and less later. Both methods produce the same total deduction over the asset's life. The difference is timing, which matters because of the time value of money and because tax rates can change.
Does accelerated depreciation save more in taxes?
It does not increase total deductions, but it usually increases their present value by pulling them forward. At a 37 percent marginal rate and an 8 percent discount rate, full first year expensing of a $100,000 asset is worth roughly $6,300 more in present value than straight line over six years. The benefit disappears if the deduction is suspended under the passive activity rules or if you expect to be in a higher bracket later.
Can I use straight line depreciation instead of MACRS?
Yes. You can elect the straight line method within MACRS under Section 168(b)(5), which keeps the normal recovery period, or elect the Alternative Depreciation System under Section 168(g)(7), which also lengthens the recovery period. Both elections are made on a timely filed return including extensions and are generally irrevocable. You can also elect out of bonus depreciation separately under Section 168(k)(7).
Is rental property depreciated straight line or accelerated?
The building structure is always straight line, over 27.5 years for residential rental and 39 years for nonresidential, using the mid month convention. Accelerated methods are not available for the structure. Components inside and around the property that qualify as 5, 7, or 15 year property can be depreciated on accelerated schedules, which is what a cost segregation study identifies.
When should I not accelerate depreciation?
Consider skipping acceleration when you are in an unusually low bracket and expect higher rates later, when passive activity or excess business loss rules would suspend the deduction anyway, when you need reported income for a loan or a pending sale, when a large depreciation deduction would reduce your Section 199A QBI deduction, or when you plan to sell quickly and recapture would arrive before the deferral has earned anything.
Related Reading
Not Sure Whether to Accelerate or Slow Down?
We model both paths against your bracket, your passive loss position, and your hold period.
Request Your Free Assessment