Why Massachusetts landlords get a smaller depreciation benefit than the federal number suggests
If you're a landlord in Boston, you've probably run the numbers on that big first-year tax deduction everyone is talking about.
On your federal return, it sounds like a dream come true. But then comes your Massachusetts return, and the number barely resembles what you expected.
Massachusetts has never let this fly
Massachusetts doesn't offer bonus depreciation for individual landlords, not the way the federal government does. Massachusetts officially rejects federal bonus depreciation rules, decoupling itself from this provision for both the corporate tax and the personal income tax.
This isn't some sort of accidental loophole or a new quirk, it's been part of Massachusetts's approach for years. The state doesn't conform to federal bonus depreciation for personal income taxes and keeps itself separate from Section 168(k) of the Internal Revenue Code. So, instead of getting the entire deduction up front in year one, you just push that deduction out over the classic timelines: 27.5 years for residential and 39 years for commercial property under MACRS.
The deduction isn't gone, it's just delayed
Here's what really matters: You aren't losing your deduction in Massachusetts. The depreciable basis, which is the portion of your purchase price you get to write off, doesn't change just because the state spreads it out. You're just losing the ability to use it all at once. That can mess with your cash flow projections, refinancing decisions and even your long-term gain when you sell, since your federal and state adjusted bases will diverge. There is a cost at the other end, too. Components reclassified into 5-, 7- and 15-year property are Section 1245 property. When you sell, the depreciation you took on them is recaptured as ordinary income rather than at the 25% rate that applies to building depreciation.
The federal rules that drive all of this are laid out at BonusDepreciation.com, an educational resource covering how bonus depreciation and cost segregation work under current law.
One more thing before you build this into your projections. A large first-year deduction does not automatically offset your W-2 or business income. Under IRC Section 469, rental losses are passive unless you qualify as a real estate professional under Section 469(c)(7), or the short-term rental exception applies and you materially participate. If neither is met, the loss is suspended and carried forward until you have passive income to absorb it or you sell the property.
The real reason is state conformity
So why do the state versus federal bonus depreciation rules diverge at all? How states handle federal tax changes comes down to a concept called state conformity, and most rental property owners don't realize how important it is.
Massachusetts is unusual here because it decouples on both sides: corporate and personal alike. So whether your rental income lands on Schedule E of your 1040 or inside a corporate return, the add-back follows you either way.
Cost segregation in Boston and a math example
Cost segregation is still worth it in Boston, even with the Massachusetts add-back. A study works by walking the property and separating out components that depreciate faster than the building itself, things like appliances, flooring, cabinetry, dedicated electrical for specific equipment, walkways, fencing and landscaping.
Take this for example: An $850,000 three-family in Dorchester, with land allocated at 22% ($187,000), leaves a depreciable basis of $663,000. A cost segregation study reclassifies 24% of that basis, $159,120, into 5-, 7- and 15-year property, all deductible in year one. The remaining $503,880 stays on the 27.5-year schedule at $18,323 a year. Total first-year deduction: $177,443, against $24,109 without the study. That is $153,334 of additional deduction, worth $49,067 to an owner in the 32% federal bracket.
The Massachusetts return is a different story. Massachusetts decouples from Section 168(k) for personal income tax, so the bonus portion is added back and the state schedule continues without it. At the 5% state rate, the year-one state benefit of the accelerated portion is zero.
Timing decides which rules you are under. The One Big Beautiful Bill Act (OBBBA), signed 4 July 2025, permanently restored the 100% rate for qualifying property acquired and placed in service on or after 20 January 2025. Property acquired before that date stays on the old phase-down schedule: 80% in 2023, 60% in 2024, 40% in 2025, 20% in 2026, and nothing from 2027 onward. The test is when you acquired the property, not simply when it went into service, and the 100% rate cannot be applied retroactively. Close in December 2024 and you are on the 60% rate, with the Massachusetts add-back on top.
The big takeaway
It's not a glitch, it's the rules working as intended. If you plan for two different depreciation schedules, you'll have a much less stressful tax season once the calendar shows April again.
This is general information, not tax advice, and readers should consult their own CPA.