Maine Bonus Depreciation: Full Add-Back, Capped Ratable Recovery.
Maine adds back the full federal §168(k) deduction in the year claimed. The delayed amount is not lost — it returns as a ratable subtraction in later years, capped so total subtractions never exceed the original addition. The same mechanism applies to corporations.
Reviewed by Cost Seg Smart Editorial Team · Last verified against 36 M.R.S. §5122 — individual additions and subtractions, Maine Revenue Services — bonus depreciation guidance
The 30-second answer: Maine has decoupled from federal §168(k) bonus depreciation. An individual claims the full federal Year-1 bonus on the federal return, but Maine adjusted gross income is increased by the full net increase in depreciation attributable to §168(k) in the year claimed.
This is a timing difference, not a lost deduction. A later subtraction returns the depreciation that would have been allowable without the bonus, computed ratably over subsequent years — and total subtractions can never exceed the original addition (36 M.R.S. §5122(1)(KK) and (2)(RR)). The exact number of recovery years was not confirmed in this review; confirm the schedule with your CPA before modeling multi-year cash flow.
On a representative Maine 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, added back for Maine purposes and recovered ratably in later years.
Federal vs Maine, Side by Side
For an individual investor's cost-segregation-reclassified components:
| Tax provision | Federal (IRC) | Maine |
|---|---|---|
| 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 | Full amount added back in the year claimed (36 M.R.S. §5122(1)(KK)) |
| Recovery of the added-back amount | Not applicable | A ratable subtraction over subsequent years, capped so the total never exceeds the original addition (§5122(2)(RR)) |
| Who the add-back applies to | Not applicable | Individuals (§5122) and corporations (§5200-A), essentially identical mechanics |
| Recovery schedule length | Not applicable | Not confirmed in this review — ratable and capped are confirmed; the exact year count is not asserted here |
| Federal usability of the deduction | Subject to passive activity, at-risk, basis, and business-interest limits | Same federal limits govern the federal deduction; Maine's addition/subtraction cycle applies independently |
Sources: 36 M.R.S. §5122, Maine Revenue Services bonus depreciation guidance, IRC §168(k). Federal bonus figures reflect current law; eligibility depends on acquisition and placed-in-service dates and elections.
How the Maine add-back works, and a citation we corrected
Maine adjusted gross income is increased by the net increase in depreciation attributable to the federal §168(k) deduction — the full amount, not a fraction of it, added back in the year the bonus is claimed. That is the standard rule under 36 M.R.S. §5122(1)(KK) for individuals, with essentially identical mechanics for corporations at §5200-A(1)(CC).
The recovery side is where the reassuring part lives: §5122(2)(RR) allows a later subtraction that returns the depreciation that would have been allowable without the §168(k) bonus, computed ratably — spread evenly, rather than all at once — over subsequent years. The subtraction is capped: total subtractions claimed over the recovery period may never exceed the original addition. We were not able to confirm the exact number of years in that ratable schedule from the sections reviewed, so this page states what is confirmed (ratable, capped at the original addition) without asserting a specific year count.
We are also correcting a mistake from an earlier review: a previous citation pointed to §5219-NN, which is actually the Maine Capital Investment Credit — a related investment credit that is referenced inside the add-back mechanics but is not itself the conformity provision. The corrected citations are §5122(1)(KK)/(2)(RR) for individuals and §5200-A(1)(CC)/(2)(FF) for corporations, both verified directly.
Illustrative numbers: a Maine 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. The Maine column is described qualitatively because the recovery period's exact length was not confirmed:
| Line item | Federal | Maine |
|---|---|---|
| Purchase price band | $250,000–$650,000 | Same property |
| Depreciable basis (20% land allocation) | $200,000–$520,000 | Same basis before the add-back |
| Reclassified to 5/7/15-yr (9–32% of basis) | $18K–$165K | Full amount added back in the year claimed |
| Year-1 treatment | $18K–$165K deducted (100% bonus, if eligible) | Full deduction added back to Maine income |
| Later-year treatment | Not applicable (already deducted) | Ratable subtraction over subsequent years, capped at the original addition |
| Marginal tax rate | Up to 37% | Maine individual income tax rate (verify current year with Maine Revenue Services) |
| Illustrative Year-1 federal tax savings on reclassified components | ~$6,660–$61,570 (37% × $18K–$165K) | Deferred via ratable subtraction, not lost — exact schedule length not confirmed |
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. The Maine addition and its ratable, capped subtraction should be modeled by your CPA against the specific years the property is held.
See a sample cost segregation report
Look at exactly what your Maine 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 Maine property
For an individual Maine investor, the workflow runs on both the federal return and the Maine return, because Maine's addition and its ratable subtraction have to be tracked over multiple years:
- Federal Form 4562: depreciation and amortization, including the §168(k) bonus deduction on eligible reclassified components. Flows to Schedule E (rental) or Schedule C (active business).
- 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.
- Maine individual income tax return: the full net increase in depreciation attributable to §168(k) is added back, per 36 M.R.S. §5122(1)(KK) (or §5200-A(1)(CC) for corporations).
- Ratable subtraction in later years: Maine recovers the added-back amount ratably, capped at the original addition, per §5122(2)(RR) — track this on the Maine return until fully recovered.
- 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; the difference is that federal claims the Year-1 bonus while Maine adds back the full amount and recovers it ratably afterward.
Form 3115 lookback on a Maine 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. For Maine, the catch-up year's bonus-eligible amount is added back the same way an ordinary Year-1 bonus would be, then recovered ratably over subsequent years, capped at the original addition, per 36 M.R.S. §5122(2)(RR).
See our full Form 3115 cost segregation guide for federal mechanics, partnership and LLC pass-through treatment, and timing rules.
Should you skip cost segregation in Maine? No.
Maine's add-back changes the timing of the state-side benefit, not the fundamental economics. The math still favors doing the study, for three reasons:
- The full federal Year-1 bonus is intact. Maine does not reduce the federal deduction; the full §168(k) bonus is claimed on the federal return. How much you use in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation.
- Maine defers the benefit, it does not eliminate it. The full add-back in the year claimed is followed by a ratable subtraction in later years, capped at the original addition (36 M.R.S. §5122(2)(RR)), so the same reclassified deduction is fully recovered on the Maine return over time.
- 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.
The nuance to flag with your CPA is that the recovery period's exact length was not confirmed in this review — only that it is ratable and capped at the original addition — so the Maine subtraction schedule should be modeled directly against current Maine Revenue Services guidance for the years the property is held.
Frequently asked
Does Maine allow bonus depreciation?
Not in Year 1. Maine is decoupled from federal §168(k): federal adjusted gross income is increased by the net increase in depreciation attributable to the §168(k) deduction, so an individual investor still claims the full federal Year-1 bonus on the federal return (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), but that amount is added back for Maine purposes in the year claimed.
Do I get the Maine add-back back, or is it lost?
It comes back, and the mechanism is worth understanding precisely. A later subtraction returns the depreciation that would have been allowable without the bonus, computed RATABLY over subsequent years — and total subtractions may never exceed the original addition. The exact number of years in that ratable schedule was not confirmed in this review, so we are not asserting a specific year count or a fixed percentage per year; the confirmed facts are that it is ratable and capped at the original addition. Confirm the precise recovery period with your CPA or Maine Revenue Services before modeling multi-year cash flow.
Does the Maine add-back apply to corporations too?
Yes, with essentially identical mechanics. The corporate provisions at 36 M.R.S. §5200-A(1)(CC) (addition) and §5200-A(2)(FF) (subtraction) parallel the individual sections at §5122(1)(KK) and §5122(2)(RR) — no substantive difference was found between the two taxpayer types.
Is there a Maine Capital Investment Credit that relates to this?
Yes, but keep it separate from the bonus depreciation add-back itself. §5219-NN is the Maine Capital Investment Credit — a related investment credit that is referenced inside the add-back mechanics, but it is not the conformity provision. An earlier version of this research cited §5219-NN as if it were the depreciation add-back section; that was wrong, and the corrected citations are §5122(1)(KK)/(2)(RR) for individuals and §5200-A(1)(CC)/(2)(FF) for corporations.
Is cost segregation still worth it in Maine?
Yes, in nearly every case. The federal Year-1 benefit is the dominant driver and Maine does not reduce it — the full federal §168(k) bonus is claimed on the federal return. At the Maine level, the add-back defers rather than eliminates the benefit: it is added back in the year claimed and recovered ratably over later years, capped at the original addition, so the full reclassified deduction is still recovered on Maine's own schedule. Whether the full federal deduction is usable in the current year still depends on federal passive-activity, at-risk, basis, and business-interest limits.
Can I use Form 3115 on a Maine property I bought years ago?
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. Any catch-up dollars are illustrative and depend on placed-in-service date, prior depreciation, bonus eligibility, land allocation, and component mix. The federal §481(a) mechanics are the primary lever; the Maine add-back and ratable, capped subtraction described above would apply the same way to the catch-up year's bonus-eligible amount.
What does a Maine 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), while for Maine purposes the full amount is added back in the year claimed and recovered as a ratable subtraction in later years, capped at the original addition. The engine ships our own calibrated, nationally-recognized construction cost data.
Related guides
- Bonus depreciation by state: overview
- All 50 states: conformity reference table
- Minnesota bonus depreciation (decoupled, 80% add-back)
- Rhode Island bonus depreciation (decoupled, permanent disallowance)
- Form 3115 cost segregation lookback: §481(a) mechanics
- What is cost segregation: the full primer
- Sample cost segregation reports