Cost Segregation Study in Maryland
Maryland is a decoupling state with a county tax layered on top, and 2026 added a new set of brackets and a capital gains surcharge to the mix. The result is a state where the cost segregation answer is genuinely more complicated than the federal answer, and where the paperwork is a real part of the engagement rather than an afterthought.
The good news is that Maryland's decoupling is well documented and mechanical. The bad news is that it is permanent, it requires an annual filing, and it means you maintain two depreciation schedules for the entire holding period.
How Maryland Income Tax Interacts With Federal Strategy
Maryland's state income tax runs on a graduated schedule from 2% to 5.75%. The Budget Reconciliation and Financing Act of 2025 added two brackets above that, effective for tax years beginning after December 31, 2025: 6.25% on Maryland taxable income above $500,000 and 6.5% above $1,000,000.
On top of the state tax, every Maryland county and Baltimore City levies its own income tax, ranging from roughly 2.25% to 3.20%. The county tax is computed on Maryland taxable income, which means a state-level deduction reduces county tax automatically. For a high-income taxpayer in a maximum-rate county, the combined marginal rate reaches roughly 9.7%.
The 2025 act also added a 2% surcharge on net capital gains for taxpayers with federal adjusted gross income above $350,000. That surcharge is new, it is aimed squarely at asset sales, and it changes the exit arithmetic for anyone who ran a cost segregation study and is now facing a disposition.
Maryland conforms to the federal passive activity loss rules of IRC Sec. 469. A loss suspended federally is suspended for Maryland.
Maryland Pass-Through Entity Tax
Maryland was one of the earliest states to adopt a pass-through entity tax, enacting it through Senate Bill 523 in 2020. The election is annual and is made on the entity return.
The rate for resident members is 8%, computed as the top marginal state rate of 5.75% plus the lowest county rate of 2.25%. For nonresident individual members the rate is 8%, and for nonresident entity members it is 8.25%.
Members receive a Maryland credit for their share of the tax paid. Because the resident rate uses the lowest county rate rather than the member's actual county rate, a member in a high-rate county such as Montgomery, Howard, or Baltimore City is still left with a county tax gap to pay at the individual level. The election does not eliminate the Maryland liability; it moves most of it to a deductible entity-level expense.
The federal benefit is the point of the election. The entity deducts the Maryland tax on its federal return, so that portion of Maryland tax escapes the individual state and local tax deduction cap.
Maryland Depreciation Conformity
Maryland decouples from federal bonus depreciation and from expanded Section 179. It has done so since 2002 and has never reconnected.
Federal bonus depreciation under IRC Sec. 168(k) is added back in full. Section 179 is limited to $25,000 with a $200,000 investment phase-out threshold, the pre-2003 federal figures. Maryland requires the adjustment to be reported on Form 500DM, the Decoupling Modification form, filed with the Maryland return every year for the life of the affected assets.
Maryland does allow the reclassification itself. A cost segregation study that moves basis into five, seven, and fifteen-year property produces those same shorter recovery periods for Maryland. You simply recover them on straight MACRS without bonus. Over a ten or fifteen-year hold that acceleration has real present value at a combined 9.7% rate, even though it is nothing like the federal year-one result.
For most real estate investors the $25,000 Section 179 cap is exhausted immediately and provides no meaningful state relief on a study that reclassifies several hundred thousand dollars of basis.
Cost Segregation Considerations Specific to Maryland
Four Maryland-specific items drive the analysis.
First, the Form 500DM burden is ongoing. This is not a one-time addback. Form 500DM is filed every year that a decoupled asset remains on the books, and the cumulative decoupling modification has to be tracked accurately across the entire holding period. A cost segregation study multiplies the number of asset lines being tracked, so the study output needs to feed a maintained Maryland depreciation schedule rather than a spreadsheet someone rebuilds from memory at year five.
Second, the county tax multiplies the value of every Maryland deduction. Investors modeling Maryland at 5.75% are understating the benefit by roughly forty percent. Run the actual county rate for the owner's residence, not the state rate alone.
Third, the new 2% capital gains surcharge changes the exit calculus. A cost segregation study converts what would have been unrecaptured Section 1250 gain into Section 1245 ordinary recapture. Ordinary recapture is not net capital gain, so it falls outside the 2% surcharge but inside the 6.5% top bracket plus county tax. Whether that trade helps or hurts depends on your income level in the sale year and needs to be modeled rather than assumed.
Fourth, the basis divergence. Maryland basis stays higher than federal basis for the life of the asset because Maryland never allowed the bonus writedown. Your Maryland gain on sale is smaller than your federal gain. This is the most common and most expensive Maryland error, and it happens because the decoupling modification history is not carried forward when a return preparer changes.
Working With AE Tax Advisors in Maryland
AE Tax Advisors works with real estate investors, business owners, and high-income professionals across Maryland and all fifty states. We are a licensed CPA and IRS Enrolled Agent practice based in Billings, Montana, and we handle the engineering-based cost segregation study, the Form 500DM decoupling modifications, the county tax modeling, the entity structuring, and the return preparation as one engagement.
Maryland is a state where the cost segregation provider and the return preparer being separate parties causes real damage. The study output has to become a maintained Maryland depreciation schedule on day one, or the decoupling adjustments drift and the error surfaces years later on a sale.
Related reading: the complete guide to cost segregation, our cost segregation study service, short-term versus long-term rental tax treatment, lookback studies and Form 3115, and multi-state tax planning.
Maryland Cost Segregation and Tax Questions
Does Maryland allow bonus depreciation on a cost segregation study?
No. Maryland has decoupled from IRC Sec. 168(k) since 2002. Federal bonus depreciation is added back and Maryland depreciation is recomputed on MACRS without bonus, with the adjustment reported on Form 500DM each year. Maryland also caps Section 179 at $25,000 with a $200,000 phase-out threshold. The shorter recovery periods from the study still apply for Maryland purposes.
How does Maryland county income tax affect the value of a cost segregation deduction?
It increases it substantially. Every Maryland county and Baltimore City levies an income tax between roughly 2.25% and 3.20% computed on Maryland taxable income, so a state deduction reduces county tax automatically. Combined with the new top state bracket of 6.5% for 2026, the marginal rate reaches roughly 9.7%. Modeling Maryland at the 5.75% state rate alone understates the benefit by about forty percent.
What is the Maryland pass-through entity tax rate?
For resident members the rate is 8%, calculated as the top marginal state rate of 5.75% plus the lowest county rate of 2.25%. Nonresident individual members are also at 8% and nonresident entity members at 8.25%. Because the rate uses the lowest county rate, members in higher-rate counties such as Montgomery or Baltimore City still owe a county gap at the individual level.
What is Form 500DM and how long do I have to file it?
Form 500DM is Maryland's Decoupling Modification form. It reports the difference between federal and Maryland depreciation caused by the bonus depreciation addback and the Section 179 cap. It is filed with your Maryland return every year that a decoupled asset remains on the books, not just in the year of acquisition, which means a cost segregation study creates a tracking obligation for the entire holding period.
Does Maryland's new 2% capital gains surcharge apply to depreciation recapture?
The 2% surcharge added by the Budget Reconciliation and Financing Act of 2025 applies to net capital gains for taxpayers with federal AGI above $350,000. Section 1245 depreciation recapture is ordinary income rather than capital gain, so it falls outside the surcharge but inside the regular brackets topping at 6.5% plus county tax. Because a cost segregation study shifts gain from Section 1250 to Section 1245, the exit should be modeled specifically.
Book a Maryland Tax Strategy Call
Pick a time below. We will walk through your Maryland property or business, model the state, county, and decoupling adjustments together, and tell you plainly whether a study is worth running.
Maryland tax rates, pass-through entity tax rules, and depreciation conformity provisions described on this page reflect law in effect as of August 2026 and are provided for general information only. State conformity changes frequently and often retroactively. Nothing here is tax advice for your situation, and no client relationship is created by reading it. Talk to us about your facts before acting.