Colorado Bonus Depreciation: Full Conformity, No Add-Back.
Colorado conforms to federal §168(k) bonus depreciation by rolling reference. Colorado taxable income starts from federal taxable income, and the statutory list of additions carries no bonus-depreciation item, so the full federal Year-1 deduction flows straight through to the Colorado return and is taxed at the flat rate.
Reviewed by Cost Seg Smart Editorial Team · Last verified against C.R.S. §39-22-104 (additions to federal taxable income), Colorado Department of Revenue
The 30-second answer: Colorado conforms to federal §168(k) bonus depreciation, for individuals and corporations alike, with no add-back to track on the state return. Colorado taxable income begins at federal taxable income, and the statutory list of additions at C.R.S. §39-22-104(3) contains no §168(k) or bonus-depreciation item, so the full federal Year-1 deduction reduces the Colorado base as well and is taxed at Colorado's flat rate of roughly 4.4% (subject to TABOR adjustments). Whether the full federal deduction is usable in the current year still depends on the federal passive-loss, at-risk, basis, and business-interest limits.
On a representative Colorado single-family rental (the single-family rental band we publish, 9–32% of depreciable basis reclassified, 16% representative), the reclassified components alone generate an estimated $18K–$165K of federal Year-1 depreciation — roughly $6,660–$61,570 of federal Year-1 tax savings at the 37% top bracket, and Colorado does not reduce it.
Federal vs Colorado, Side by Side
For an individual investor's or Colorado corporation's cost-segregation-reclassified components:
| Tax provision | Federal (IRC) | Colorado income tax |
|---|---|---|
| Bonus depreciation under §168(k) | 100% may apply to qualified property acquired and placed in service after January 19, 2025, subject to §168(k) eligibility, related-party/prior-use, binding-contract, and election rules | Fully carried through. Rolling conformity to the Internal Revenue Code, and no §168(k) item in the statutory additions |
| Add-back required? | Not applicable | None. C.R.S. §39-22-104(3), the list of additions to federal taxable income, carries no bonus-depreciation item |
| Corporate treatment | Federal taxable income reflects bonus claimed | Starts at the same federal figure and likewise has no bonus-depreciation addition |
| Income tax on rental income | Ordinary rates, up to 37% | Flat income tax of roughly 4.4% (subject to TABOR adjustments) on Colorado taxable income |
| MACRS asset class lives | 5 / 7 / 15 / 27.5 / 39 yr per Rev. Proc. 87-56 | Same class lives; the Colorado return simply carries the federal figures through |
| Federal usability of the deduction | Subject to passive activity, at-risk, basis, and business-interest limits | Same federal limits govern the federal deduction; Colorado adds no state-level reduction |
| Depreciation form the individual files | Form 4562 → Schedule E (rental) or Schedule C (active business) | Colorado individual income tax return, which starts from federal taxable income with no depreciation addition |
Sources: C.R.S. §39-22-104 (additions to federal taxable income), Colorado Department of Revenue, IRC §168(k). Federal bonus figures reflect current law; eligibility depends on acquisition and placed-in-service dates and elections.
How Colorado's conformity was actually checked
A rolling-conformity label alone is not enough to build a page on. Several states use identical-sounding conformity language while carrying a separate add-back buried elsewhere in the code, and a conformity date cannot tell those states apart from genuinely conforming ones. In Colorado the structure makes the question narrow: Colorado taxable income begins at federal taxable income, which already reflects whatever depreciation was claimed federally, so the only way the bonus could be clawed back at the state level is through a statutory addition.
The additions themselves were therefore read directly. C.R.S. §39-22-104(3) enumerates what must be added back to federal taxable income to reach Colorado taxable income, and it contains no §168(k) item and no bonus-depreciation item of any kind. The corporate side starts from the same federal figure and likewise carries no depreciation addition, so there is no separate Colorado calculation for a corporation either.
Verified 2026-09-07 against the Colorado Revised Statutes and the Colorado Department of Revenue.
Illustrative numbers: a Colorado single-family rental
Using the single-family residential (SFR) band we publish — 9–32% of depreciable basis reclassified into 5/7/15-year property, 16% representative — on a property priced between $250,000 and $650,000, with a 20% residential land allocation, and 100% federal bonus depreciation for eligible components under current law. Headline dollars are federal; the Colorado effect is described qualitatively rather than quoted as a precise state figure:
| Line item | Federal | Colorado |
|---|---|---|
| Purchase price band | $250,000–$650,000 | Same property |
| Depreciable basis (20% land allocation) | $200,000–$520,000 | Same basis, no state adjustment |
| Reclassified to 5/7/15-yr (9–32% of basis) | $18K–$165K | Carried through in full |
| Year-1 treatment | $18K–$165K deducted (100% bonus, if eligible) | Same $18K–$165K deducted, no add-back |
| Marginal tax rate | Up to 37% | Flat rate of roughly 4.4%, subject to TABOR adjustments (verify the current year with the Colorado Department of Revenue) |
| Illustrative Year-1 federal tax savings on reclassified components | ~$6,660–$61,570 (37% × $18K–$165K) | Full deduction carries through and reduces Colorado taxable income at the flat rate; no state-level reduction of the deduction itself |
Figures are illustrative and use the site's published SFR reclassification band; your result depends on your basis, land allocation, bracket, component mix, and eligibility. Whether the full federal deduction is usable in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation.
See a sample cost segregation report
Look at exactly what your Colorado study delivers: the component-by-component 5/7/15-year schedule, the Form 4562-ready numbers, and the documentation your CPA files. Real reports are our best answer to "is this legit?"
Forms your CPA files for a Colorado property
Because Colorado conforms with no add-back, the workflow is simpler than a decoupled state — there is no state-side addition or later subtraction to track over multiple years:
- Federal Form 4562: depreciation and amortization, including the §168(k) bonus deduction on eligible reclassified components. Flows to Schedule E (rental), Schedule C (active business), or the applicable corporate return.
- Schedule E (or Schedule C): the accelerated federal deduction reduces federal taxable income in Year 1, subject to the federal passive-loss, at-risk, basis, and business-interest limits.
- Colorado individual or corporate return: the federal figures carry through directly, taxed at the flat rate of roughly 4.4% (subject to TABOR adjustments). No add-back line, and nothing to track in later years.
- Form 3115 §481(a) section: included only if this is a federal lookback method change on a property placed in service in a prior year (see below).
The reclassified schedule is the same engineered output for both books; Colorado simply does not require a second calculation.
Form 3115 lookback on a Colorado property
If the property was placed in service in a prior tax year and depreciation was reported using a non-segregated method, a federal Form 3115 (Application for Change in Accounting Method) may allow a current-year §481(a) catch-up adjustment for the accelerated depreciation you missed, generally without amending prior returns. This is often the single biggest acceleration mechanism in cost segregation. Any catch-up dollars are illustrative and depend on placed-in-service date, prior depreciation claimed, bonus eligibility, land allocation, and component mix.
The federal §481(a) catch-up is the primary lever, and it remains subject to the federal passive-loss, at-risk, and basis limits. Because Colorado conforms with no add-back, the catch-up is already inside the federal taxable income figure the Colorado return starts from, so it reduces Colorado taxable income in the same year it is taken, taxed at the flat rate. There is no separate Colorado method-change filing.
See our full Form 3115 cost segregation guide for federal mechanics, partnership and LLC pass-through treatment, and timing rules.
Should you do cost segregation in Colorado? Usually yes.
Colorado is one of the cleaner states in this series for a property owner, for three reasons:
- Full conformity, individual and corporate alike. The federal §168(k) bonus flows straight through, with no add-back to track and no later subtraction schedule to manage.
- Verified against the operative additions, not the conformity label alone. C.R.S. §39-22-104(3) was read directly for a hidden §168(k) add-back, and none is there.
- The Form 3115 lookback still captures missed federal years. If the property was placed in service in a prior year and depreciated without cost segregation, the federal §481(a) catch-up may be available, generally without amending prior returns, and it reduces the Colorado base in the same year.
The nuance to flag with your CPA is a federal one, not a Colorado one: whether the full federal deduction is usable in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation. Colorado itself adds no separate limitation, and the flat rate means the state-side effect does not shift with your bracket.
One forward-looking caveat, stated as a caveat and not as a deadline: Colorado has considered decoupling from federal bonus depreciation before, a bill introduced in the 2026 session that would have required a state add-back failed in committee and never became law, and any rolling-conformity state can revisit what it conforms to, so confirm the treatment for your own tax year with your CPA. This page is educational and is not tax advice for your specific situation.
Frequently asked
Does Colorado allow bonus depreciation?
Yes. Colorado conforms to the federal Internal Revenue Code by rolling reference, and Colorado taxable income starts from federal taxable income. The statutory list of additions to federal taxable income at C.R.S. §39-22-104(3) contains no §168(k) item and no bonus-depreciation add-back, so current federal §168(k) bonus depreciation (100% may apply to qualified property acquired and placed in service after January 19, 2025, subject to §168(k) eligibility, related-party/prior-use, binding-contract, and election rules) carries through to the Colorado return automatically.
How does Colorado's flat income tax rate interact with a Year-1 federal deduction?
Colorado applies a single flat rate of roughly 4.4% (subject to TABOR adjustments) rather than graduated brackets, and it applies to Colorado taxable income, which begins at federal taxable income. So the accelerated deduction does its work before Colorado ever sees the number: a dollar of federal Year-1 depreciation removes a dollar from the Colorado base as well, and the state benefit is that dollar multiplied by the flat rate. Two consequences follow. First, the federal deduction is the dominant driver, because a 37% top federal bracket is many times the state rate. Second, the flat structure means the state-side effect does not vary with your income level the way it would in a graduated state. The state benefit is real but modest relative to the federal one, and the size of both depends on your basis, component mix, and eligibility.
Does Colorado tax my rental income?
Yes. Colorado imposes a flat income tax of roughly 4.4% (subject to TABOR adjustments) on Colorado taxable income, which starts from federal taxable income, so net rental income is taxed at the state level. Unlike a no-income-tax state, a Colorado investor does have a state return on which depreciation matters, and because Colorado adds no bonus depreciation back, the federal acceleration reduces that state return too.
How was Colorado's conformity actually checked, rather than assumed?
By reading the operative modification section directly rather than inferring conformity from a rolling-conformity label. Colorado taxable income begins at federal taxable income, so the question is entirely whether an addition puts the bonus back. The statutory list of additions at C.R.S. §39-22-104(3) was read for a §168(k) or bonus-depreciation item and none is there. That matters because several states use identical-sounding rolling-conformity language while carrying a separate add-back elsewhere in the code, and a conformity date alone cannot tell those states apart.
Can I use Form 3115 on a Colorado property I bought years ago, and what does the catch-up do at the Colorado level?
Often, yes, at the federal level. If the property was placed in service in a prior tax year and depreciation was reported using a non-segregated method, a federal Form 3115 (Application for Change in Accounting Method) may allow a current-year §481(a) catch-up for the accelerated depreciation you missed, generally without amending prior returns. At the Colorado level the mechanics are simple precisely because conformity is rolling and there is no add-back: the catch-up is already inside the federal taxable income figure the Colorado return starts from, so it reduces Colorado taxable income in the same year it is taken, taxed at the flat rate. There is no separate Colorado method-change filing and no state subtraction schedule to carry forward. Any catch-up dollars are illustrative and depend on placed-in-service date, prior depreciation, bonus eligibility, land allocation, and component mix.
Is cost segregation still worth it in Colorado?
Yes, and Colorado does not blunt the benefit the way a decoupled state does. The federal §168(k) bonus flows straight through to the Colorado return, with no state-level add-back to track and no later state subtraction schedule to manage, and the resulting reduction is taxed at the flat rate of roughly 4.4% (subject to TABOR adjustments). Whether the full federal deduction is usable in the current year still depends on federal passive-activity, at-risk, basis, and business-interest limits, which are federal questions rather than Colorado-specific ones.
What does a Colorado cost segregation study rely on for its numbers?
The study reclassifies building components into IRS-recognized MACRS class lives (5, 7, and 15-year) per Rev. Proc. 87-56, using an engineering-based methodology that follows the IRS Cost Segregation Audit Techniques Guide (Publication 5653). The reclassified components may then qualify for federal §168(k) bonus depreciation on the federal return (100% for qualified property acquired and placed in service after January 19, 2025, subject to eligibility and election rules), and Colorado's rolling conformity carries that same deduction through to the state return with no add-back. The engine ships our own calibrated, nationally-recognized construction cost data.
Related guides
- Bonus depreciation by state: overview
- All 50 states: conformity reference table
- Utah bonus depreciation (conforms, rolling reference)
- California bonus depreciation (non-conforming)
- Texas bonus depreciation (no state income tax)
- Form 3115 cost segregation lookback: §481(a) mechanics
- What is cost segregation: the full primer
- Cost segregation in Colorado: market and property examples
- Sample cost segregation reports