Hawaii does not conform to federal §168(k) — 100% of your federal bonus depreciation must be added back on the Hawaii state return. The federal deduction is unaffected; on the Hawaii side you recover the timing difference through standard MACRS depreciation over the property's 5/15/27.5-year life. At Hawaii's 11% top marginal rate, this is the second-largest state-level penalty in the country after California. Compare Hawaii's treatment to every other US jurisdiction in the complete state-by-state conformity map.
Modeled on a $150,000 federal §168(k) deduction.
How Hawaii Treats §168(k) — The Add-Back Mechanic
Hawaii's approach is unusually blunt. Hawaii Revised Statutes §235-2.4(a) states that IRC §168(k) "shall not be operative for purposes of this chapter." There is no rolling-conformity carve-out to interpret, no fixed-date snapshot to update — the section is simply inoperative. Hawaii depreciation for STR property is always computed under the standard IRC §168(a)-(j) MACRS schedule without any bonus component.
Mechanically, the STR investor claims the full federal §168(k) bonus on Schedule E of the federal return, then reports the federal deduction as an addition modification on Hawaii Schedule N-11 (residents) or N-15 (non-residents). Hawaii depreciation is then computed without bonus and taken as a subtraction over the property's normal MACRS life.
The combination of full decoupling and a high 11% top marginal rate produces one of the largest state-level dollar penalties in the country. Only California (~$19,950 miss at 13.3%) beats Hawaii's ~$16,500 miss on a $150,000 federal bonus deduction.
Worked Example — $150,000 Federal Deduction on a Hawaii STR
Assume an STR investor buys a Maui condo, closes 2026, and identifies $150,000 in bonus-eligible 5-year and 15-year assets through a cost-segregation-quality report.
| Line | Federal | Hawaii |
|---|---|---|
| Year 1 §168(k) deduction (bonus-eligible portion) | $150,000 | $0 (100% add-back) |
| Year 1 tax savings @ 37% federal / 11.00% HI top | $55,500 | $0 |
| Year 1 Hawaii MACRS recovery (approx.) | — | ~$16,900 (blended 5/15/27.5-yr MACRS) |
| Years 2 through end of asset life — HI subtraction modification | — | Remaining ~$133,100 recovered ratably |
The Year-1 Hawaii miss is roughly $16,500 in state tax that would have been saved had Hawaii conformed ($150,000 × 11.00% top rate). That timing loss reverses as Hawaii depreciation exceeds federal in later years, but the up-front hit is material. For a Hawaii STR, the state add-back is arguably the second-most-important tax number after the federal §168(k) deduction itself.
Pre-purchase, you can run the address on your property to see the combined federal-and-state after-tax cash flow before writing an offer.
The Statute Explained
Hawaii uses a mix of rolling and specified-date IRC conformity for various sections, but §168(k) is handled with a straight statutory exclusion. HRS §235-2.4(a) enumerates federal IRC provisions that "shall not be operative for purposes of this chapter," and §168(k) is on that list. There is no five-year recovery window (as in Connecticut), no partial percentage adoption (as in Minnesota or North Carolina), and no manufacturing-specific exception (as in Maryland).
OBBBA (P.L. 119-21) restored 100% federal bonus for property acquired and placed in service after January 19, 2025. Hawaii's exclusion applies to that restored federal deduction just as it applied to prior versions of §168(k) — the statute is category-based, not date-based.
How Hawaii Compares to Federal-Conforming States
Roughly half the country conforms to federal §168(k) via rolling IRC conformity. In a full conformer like Colorado (4.4% flat), the same $150,000 federal bonus produces an additional $6,600 in Year-1 state savings on top of the federal $55,500. Hawaii gets $0 in Year 1 — and because Hawaii's top rate is 11%, the timing loss is significantly larger than in lower-rate decoupled states.
Compared to other decoupled states, Hawaii is at the top of the dollar-impact league table: only California's 13.3% + full decoupling produces a larger Year-1 miss. Contrast against how California does it, or use the state conformity tool to run Hawaii side-by-side with any other state at any federal deduction amount.
What This Means for Your STR Purchase Decision
For an STR investor evaluating a Maui, Kauai, or Big Island property, Hawaii's non-conformity is a first-order tax number. Two takeaways:
First, the federal Year-1 bonus deduction is still the largest single tax lever — Hawaii takes nothing away from the federal $55,500 in Year-1 savings on a $150,000 bonus. Second, the Hawaii timing miss is materially larger than in most states. On the same $150,000 bonus, Hawaii's ~$16,500 Year-1 hit is roughly the same magnitude as your entire annual Hawaii income tax on $150K of net rental income. It should be baked into every Hawaii STR after-tax return model before writing an offer.
Before writing an offer on any Hawaii STR placed in service after January 19, 2025, run the address on your property to get a line-item breakdown before committing.
Analyze a specific Hawaii property
Run any Hawaii STR listing through DepreciMax's $99 property report — line-item finish classification closely calibrated to a formal cost seg study, includes Hawaii-specific add-back math.
Frequently Asked Questions
Does Hawaii plan to conform to §168(k) in 2026?
No. Hawaii Revised Statutes §235-2.4(a) explicitly makes IRC §168(k) inoperative for Hawaii income tax purposes. No 2026 legislation has been introduced to conform. The statutory exclusion applies to all §168(k) property regardless of federal placed-in-service date.
Can I still take federal bonus depreciation if I live in Hawaii?
Yes. The federal §168(k) deduction is unaffected. A Hawaii resident STR investor placing a property in service after January 19, 2025 can claim the full 100% federal bonus deduction under OBBBA (P.L. 119-21). Hawaii only changes the state-return calculation.
How do I report the Hawaii §168(k) add-back?
Hawaii taxpayers report the federal §168(k) bonus as an addition modification on Hawaii Schedule N-11 (residents) or N-15 (non-residents). Hawaii depreciation is then computed without §168(k) under the standard IRC §168(a)-(j) schedule.
What happens on sale — does Hawaii recapture the difference?
Hawaii basis is higher than federal basis by the unrecovered add-back amount. On sale, Hawaii gain is correspondingly smaller than federal gain, so the state timing difference reverses through subtractions across the depreciation period and, if not fully absorbed, through a lower Hawaii gain at disposition.
Does Hawaii's decoupling apply to §179 too?
Hawaii conforms to federal §179 expensing at a reduced state dollar limit (currently $25,000, not the federal $1M+ limit). The §168(k) exclusion under HRS §235-2.4(a) is a separate, permanent statutory carve-out for bonus depreciation.
Every state's §168(k) position, in one place
Interactive map, sortable table, and deep-dive guide for each of the 51 jurisdictions — post-OBBBA verified.
See the 50-state map →Hawaii statute: HRS §235-2.4(a); Hawaii Department of Taxation Tax Information Release (TIR) Archive (tax.hawaii.gov). Federal authority: IRC §168(k), as amended by the One Big Beautiful Bill Act (P.L. 119-21) restoring 100% bonus depreciation for property acquired and placed in service after January 19, 2025. Nothing in this article is tax advice. Consult a CPA who specializes in real estate before making investment decisions based on state-conformity projections.