Straight-Line vs Accelerated Depreciation: Compare Timing
By AE Tax Advisors ยท Published 2026-08-13
Updated November 8, 2026.
Straight-line and accelerated methods allocate depreciation differently across years. A faster deduction can improve cash flow, but the benefit depends on whether it is usable, the tax rate in each year and what happens when the asset is sold. It is not automatically permanent tax savings.
Compare the same basis and conventions
For a $100,000 five-year asset using the half-year convention, straight-line deductions would be $10,000, $20,000, $20,000, $20,000, $20,000 and $10,000. Under 200% declining-balance MACRS, they would be $20,000, $32,000, $19,200, $11,520, $11,520 and $5,760. Both total $100,000 under these assumptions with no early disposition.
An eligible 100% bonus deduction could place the $100,000 in year one. Eligibility, elections, business use and other rules must be established before using that column in a projection.
Make the time-value assumptions visible
Assume every deduction is immediately usable at a constant 37% tax rate and every tax benefit arrives at the end of the corresponding year. Discounting at 8% to the beginning of year one gives approximately $28,500 for the straight-line sequence, $30,000 for declining balance and $34,300 for a full year-one deduction. These are illustrative present values, not a client outcome.
The undiscounted benefit is $37,000 in each case under the constant-rate assumptions. A different benefit date, discount rate, tax bracket or suspended deduction changes the comparison. Do not count a year-one payment as occurring immediately while discounting the other options from an earlier date.
Apply property-specific methods and elections
Many short-lived GDS assets use declining balance; buildings generally use straight line over the applicable period. Statutory exceptions, ADS and available elections matter. The MACRS guide explains how classes and conventions fit together.
Electing out of bonus generally operates by property class. Other method elections have their own scope, timing and revocation rules. Compare the entire year's asset list before making a choice, and check current procedures if correcting an old election.
When slower deductions can be worth considering
- A current loss would be suspended for several years.
- Future deductions may fall in a higher effective tax bracket.
- Current deductions reduce another tax benefit, such as QBI.
- A near-term sale accelerates recapture or changes gain character.
- State law treats accelerated deductions differently.
Tax depreciation and book reporting are different systems. Do not assume a tax-method election changes financial-statement income in the same way. For a decision, model the actual returns and cash flows, including disposition, rather than comparing only the size of year-one depreciation.
Request a projection with your asset ledger, income estimates, carryforwards and expected holding period.
Frequently Asked Questions
Does faster depreciation increase total deductions?
Not in the simplified comparison with the same basis and full recovery. It changes timing; actual sales and other rules can change the final result.
Is bonus always worth more today?
Only if the assumptions support it. Suspended losses, changing rates and later recapture can change the economics.
Can I compare present values without saying when tax is saved?
No. Use consistent benefit dates, rates and discount timing for every option.
Sources and update notes
Source references and the changes described in this guide were checked November 8, 2026. Published by AE Tax Advisors; see our editorial policy. Examples are illustrative and require review of your records before filing.