Jason E. Marx is a Partner at Mandelbaum Barrett PC, and a member of the firm’s Tax, Trusts, and Estates Practice Groups. His practice focuses on estate planning, estate administration, elder law, wills and trusts, tax and business planning for individuals, corporations, partnerships and limited liability companies, and tax controversies.

Mr. Marx serves as a strategic advisor to high net worth and ultra-high net worth individuals, families, executives, business owners, executors and trustees.  He counsels clients on a wide range of issues in the areas of taxation, trust and estate law.  His work encompasses the structuring of wealth preservation and asset protection strategies and the preparation of estate planning documents such as wills, living wills, powers of attorney, trust agreements, special needs trusts and domestic and offshore asset protection trusts.  Mr. Marx advises executors and trustees on the practical and successful administration of estates and trusts, including the minimization of trust and estate tax liability and the oversight of probate and the estate/trust administration process.  He assists clients with the formation of various business entities, including corporations and limited liability companies, and the preparation of buy-sell agreements, the orderly succession of business interests, the structuring of business mergers, acquisitions and sales, and the preparation of federal and state gift tax returns, estate tax returns and inheritance tax returns.  He represents clients in tax controversy matters before the Internal Revenue Service and state taxation agencies.

Mr. Marx also has significant experience in elder law where he guides clients through the challenges associated with planning for long term care needs, guardianships, and eligibility for Medicaid and related public assistance and government benefit programs.

Mr. Marx frequently lectures and writes about estate and assets protection planning, elder law and Medicaid planning and business succession planning.

Jason earned his LL.M. in Taxation from New York University School of Law, his J.D. with a concentration in Taxation and Health Law from Seton Hall University School of Law, and his B.S.B.A. in Finance from Boston University School of Management.

Marx, Jason. “Navigating the Future: Succession Planning for Auto Repair Shop Owners” Thomas Greco Publishing, November 2024.

Marx, Jason. “Estate Planning Challenges for Same-Sex Couples.” Issues and Ideas with Chris DeBello. 106.3 WHCY-FM, 25 June 2023.

New Jersey Society of CPAs (NJCPA) Webinar: “Gift Tax Returns & Valuation Tips for CPAs”, May 13, 2025.

Hot Topics in Elder Law Speaker Series: “Myths and Misconceptions in Estate and Medicaid Planning,” March 8, 2023.

Hot Topics in Elder Law Speaker Series: “Legacies Instead of Litigation – Tips to Stay Out of Court for the Aging Population,” April 18, 2023.

New Jersey

New York

Federal District of New Jersey

United States Tax Court

New York University School of Law, LLM, Taxation, 2003

Seton Hall University School of Law, J.D., Concentration in Taxation and Health Law, 1998

Boston University, BSBA, Finance, 1990 (Zeta Beta Tau Fraternity, Golden Key National Honor Society)

 

The High Cost of Delay: Ultra-High-Net-Worth Estate Planning & Asset Protection

August 18, 2025

The Looming Estate Tax Challenge for Ultra-High-Net-Worth Individuals For ultra-high-net-worth estate planning, the stakes for estate and asset protection have never been higher—or more urgent. For ultra-high-net-worth individuals (UHNWIs) whose estates far exceed the 2025 federal lifetime exemption of $13.99 million per person, the risks are clear. Although the current federal exemption will not sunset […]

Veterinary Practice Buy-In: Phantom Equity, Vesting, Conversion, and Tax Implications

July 24, 2025

For many veterinary practices, the next generation of ownership begins with a conversation between a practice owner and a valued associate. While traditional buy-ins often involve a direct purchase of equity, innovative approaches, such as phantom equity, offer greater flexibility, improved retention incentives, and a smoother transition for both parties. This article explores a scenario […]

The High Cost of Delay: Why Ultra-High-Net-Worth Families Must Act Now on Estate and Asset Protection

May 20, 2025

For ultra-high-net-worth individuals (UHNWIs) whose estates far exceed the 2025 federal lifetime exemption of $13.99 million per person, the stakes for estate and asset protection planning have never been higher-or more urgent. With the current exemption set to plummet at the end of 2025, and a flat 40% federal estate tax rate looming over every […]

Legal Wins and Business Guidance for New York Clients

May 13, 2025

In our latest New York Legal Update, the Mandelbaum Barrett PC team shares key victories and timely insights for businesses and individuals navigating the Empire State’s complex legal landscape. This edition highlights: We also break down critical updates in ADA litigation, arbitration strategies, trade policy, and the elimination of federal paper checks. Read the full […]

Don’t Ignore Planning for the New York Estate Tax

April 22, 2025

The Upcoming Federal Estate Tax Sunset: What You Need to Know Many high-net-worth clients are busy planning for the possibility of a Federal estate tax exclusion sunset scheduled to occur on January 1, 2026. This will occur automatically unless Congress is able to pass major budget legislation to avert a per person reduction in the […]

New York Newsletter: Winter Edition

December 16, 2024

Check out our NYC Newsletter to read about our recent successes, important legal updates, and how our team is closing out the year. 🗽📖 Read it Here.

Elder Law and Special Needs Newsletter: November 2024 Issue

November 5, 2024

The November Elder Law & Special Needs Newsletter is Here! Check out our latest edition! In this issue, our attorneys cover essential topics like Medicare Open Enrollment, which is happening now, and discuss new rules for senior drivers. Plus, get the scoop on the latest firm news and see what our attorneys have been up […]

Legacy Lesson: Protecting Family Wealth

October 17, 2024

Nora and Jake’s concerns are shared by many parents who want to protect their children’s inheritance from the potential fallout of a divorce. By setting up a discretionary trust and considering prenuptial agreements, they can significantly reduce the risk of their assets being exposed to legal claims. These strategies, guided by expert advice from Jason Marx, ensure that their legacy remains intact and protected for future generations.

Understanding Wills and Trusts

October 3, 2024

Jason Marx emphasizes that a well-rounded estate plan often includes both a will and a trust. The will can capture any assets not placed in the trust, ensuring they are distributed according to Margaret’s wishes. Meanwhile, the trust can handle specific assets or charitable donations, offering privacy and potentially avoiding the probate process, especially in states where probate might be costly or time-consuming.

Legacy Lesson: A Lasting Legacy

September 12, 2024

The Thompsons’ journey into charitable planning highlights the importance of thoughtful estate planning. By considering these various options, they can ensure that their passion for education and animal welfare continues to make a difference long after they’re gone. Whether through direct donations, charitable trusts, a private foundation, or a donor-advised fund, the Thompsons can create a lasting legacy that reflects their values and supports the causes they hold dear.

The Crucial Role of Healthcare Directives in Estate Planning

August 22, 2024

In estate planning, it’s not about prioritizing one document over the other; it’s about ensuring that you have a comprehensive plan in place. By taking the time to establish both a healthcare directive and a durable power of attorney, you can rest assured that your wishes will be respected and that those you trust will have the legal authority to act on your behalf when it matters most.

LEGACY LESSON: Understanding Estate Planning

July 15, 2024

In this episode of LEGACY LESSON, Jason Marx explains the critical differences between wills and trusts through the story of Margaret, a widow ensuring her estate is distributed to her children and charity.

Maximizing Real Estate Investments: Key Estate Planning Strategies

May 31, 2024

Sarah and Raj, a mid-30s couple, are guided by tax, trust, and estates attorney Jason Marx in exploring estate planning strategies for their growing real estate investments. Marx's comprehensive approach underscores the importance of foresight and strategic planning in maximizing the potential of real estate investments while safeguarding against future uncertainties.

Elder Law and Special Needs Newsletter: April 2024 Issue

April 15, 2024

Check out our April Elder Law and Special Needs newsletter! Our legal team explores important topics including beneficiary designations and the recent updates to the Medicaid divisor, which came into effect this month. We also give updates on the latest happenings around our firm. Stay in the know and empowered with the freshest insights from […]

Estate Planning Explained by Jason Marx: Phases and Components

March 25, 2024

Jason Marx breaks down the critical phases and components of estate planning. Whether you're starting your estate plan or looking to update an existing one, this video provides valuable insights into the essential documents and decisions that form the backbone of a comprehensive estate plan.

Essential Surrogate Decision Making Documents

March 6, 2024

Jason E. Marx, partner at Mandelbaum Barrett PC, emphasizes the critical role of surrogate decision-making documents, such as powers of attorney, living wills, and advanced healthcare directives. These documents ensure someone trusted can make decisions on your behalf during incapacity. Without these preparations, families face the complex process of obtaining guardianship, which can be lengthy and costly.

Constitutionality of the Corporate Transparency Act

March 4, 2024

On March 1, 2024, the U.S. District Court in Alabama declared the Corporate Transparency Act (CTA) unconstitutional, challenging its mandate for a national database of business owners aimed at curbing financial crimes. The Court found the Act exceeded legislative powers, failing the "necessary and proper" test. This pivotal decision, favoring the National Small Business Association's injunction request, raises questions on the enforcement implications for non-party companies. The ruling's broader impact on financial crime prevention efforts remains under scrutiny as developments continue.

Elder Law and Special Needs Newsletter: February 2024 Issue

February 16, 2024

Our February Elder Law and Special Needs newsletter is now available! In this issue, our attorneys delve into timely topics such as recent legislative developments in New Jersey. Specifically, we explore new laws designed to support drivers with Autism, as well as initiatives establishing “Presumptive Eligibility” under Medicaid’s Home and Community-Based Services Waiver Program. Stay […]

Understanding the 2024 IRS Updates on Estate and Gift Tax Exemptions

January 10, 2024

In 2024, significant changes to the IRS regulations regarding estate and gift tax exemptions are set to take effect. These updates, critical for individuals and couples engaged in estate planning, herald a substantial shift in the financial planning landscape. Jason Marx, partner in the Tax Trust and Estates Practice Group at Mandelbaum Barrett PC, provides insights into these changes and their implications.

2024 Updates to the Lifetime Exemption to the Federal Gift and Estate Tax

November 27, 2023

The IRS has announced some important updates to the federal gift and estate tax exemptions for the year 2024. These updates have significant implications for individuals and couples who are considering their estate planning strategies. Jason Marx breaks down the key details of these updates and discuss why it's important to take action sooner rather than later.

“Preserving Smiles and Wealth with Estate and Asset Protection Planning” by Jason Marx

November 21, 2023

Join Jason Marx, Partner at Mandelbaum Barrett PC, in an enlightening presentation on Estate Planning and Asset Protection. Learn the crucial elements of safeguarding wealth through wills and trusts, and delve into legal tools for effective asset protection. Engage in interactive discussions and real-life case studies to deepen your understanding of the process and related concerns.

Jason Marx: Navigating Tax and Estate Planning with Empathy

October 30, 2023

Discover the trajectory of Jason Marx, the distinguished Tax and Estate Planning Attorney, with a profound 25-year legal background. Initially a wealth advisor, he transitioned to law, securing a Master of Laws in Taxation. Engaged with numerous business owners, he emphasizes the crucial handling of corporate and partnership affairs with empathy, crafting estate plans to meet their objectives.

The Crucial Role of Domicile for Retirees: Insights from a Trusts and Estates Attorney

July 21, 2023

When retirees consider relocating to a new state to enjoy their retirement, they often overlook the significance of establishing domicile in their chosen location. As a trusts and estates attorney, I have witnessed the legal and financial implications that arise when retirees fail to properly establish their domicile. In this blog, we will explore the […]

Elder Law and Special Needs Newsletter – June 2023 Issue

June 9, 2023

Our Elder Law and Special Needs attorneys are pleased to present their June newsletter. Check it out for articles on Hot Topics including why you don’t want to wait until you’re sick to create an estate plan. It also highlights our team’s recent and upcoming events and presentations. Read the full newsletter here.

Mandelbaum Barrett PC Elder Law and Special Needs Newsletter: February 2023 Issue

February 27, 2023

The Elder Law and Special Needs Departments at Mandelbaum Barrett PC are pleased to bring you our February newsletter in its new and improved format. Check out the Hot Topics and industry events our team has been busy with. As always, we would love to hear your feedback! Read the full newsletter here.

Elder Law and Special Needs Newsletter: January 2023 Issue

January 5, 2023

In the January issue of our Elder Law and Special Needs Newsletter, our attorneys share some of their recent articles on industry hot topics, such as “5 Reasons for Seniors to Celebrate in 2023.” We also highlight recent and upcoming events including our Elder Law Team (Richard Miller, Esq., Jason Marx, Esq., Shawna Kirchner Brown, Esq., Donald “Donny” […]

Peter Tanella and Jason Marx Co-Author Article for Today’s Veterinary Business Titled “You, Your Legacy and Your Practice’s Future”

October 16, 2025

Featured in the October Issue of Today’s Veterinary Business: Peter Tanella, Esq., Chair of the National Veterinary Law Group and Jason Marx, Esq., Partner in the Trusts & Estates Practice Group at Mandelbaum Barrett PC, co-authored an article focusing on a critical topic for veterinary professionals: estate and business succession planning for practice owners. Veterinarians […]

29 Attorneys Recognized on the Best Lawyers in America® 2026 List.

August 22, 2025

Being recognized in the Best Lawyers in America® 2026 means more to our attorneys than just being included on a list. They put their reputation, skill, and dedication into every case and every client, and we are humbled that 29 members of our team have been honored this year. Listed below are our firm’s attorneys recognized […]

Navigating Gift Tax Returns: Key Insights from Martin D. Hauptman and Jason Marx at NJCPA Webinar

May 21, 2025

Nearly 200 CPAs from across New Jersey tuned in for a recent New Jersey Society of CPAs (NJCPA) webinar led by Martin D. Hauptman, Esq., and Jason Marx, Esq. The session covered key considerations when preparing gift tax returns and addressed complex valuation issues that practitioners frequently encounter.

Gift Tax Return & Valuation Webinar

May 13, 2025

Nearly 200 CPAs from across New Jersey tuned in for a recent NJCPA webinar led by Martin D. Hauptman and Jason A. Marx. The session covered key considerations when preparing gift tax returns and addressed complex valuation issues that practitioners frequently encounter. Martin and Jason shared practical tips, answered questions in real time, and offered […]

Supporting Our Community at the Taste of Talent Fundraiser

May 9, 2025

It was an evening of great food while supporting a cause that aligns with our firm’s values. Project Self-Sufficiency provides essential services—education, job training, and support programs—that help people build stronger futures. We were glad to be there as active participants in a cause that matters.

New Jersey Automotive Magazine: A Practical Guide to Legal Compliance for Repair Shops

November 8, 2024

Jason Marx, Partner in the Tax, Trusts and Estates Practice Group, has contributed an article to the November issue of New Jersey Automotive Magazine. This piece, featured in the Legal Perspective section, provides a clear overview of essential legal practices for New Jersey’s auto repair shops and collision centers. In the article, Jason outlines compliance […]

Mandelbaum Barrett PC to Host 1st Annual Elder Law Day

February 12, 2024

The Elder Law Practice Group at Mandelbaum Barrett PC will be hosting our 1st Annual Elder Law Day at the Park Avenue Club in Florham Park, NJ on Friday, March 22nd from 8:30am until noon. Elder Law Day aims to empower individuals involved in caring for and assisting the elderly and disabled, whether they are […]

Jason Marx Presents Webinar on Estate and Asset Protection for the New York County Dental Society

September 5, 2023

The National Dental Law Group at Mandelbaum Barrett PC has collaborated with the New York County Dental Society to provide exclusive video webinars focusing on the legal aspects of dentistry. To start the series, Partner at Mandelbaum Barrett PC Jason E. Marx, will deliver an informative webinar titled, “Preserving Smiles and Wealth with Estate and […]

Alex Keoskey and Jason Marx to exhibit at upcoming TriState Medical Conference

August 31, 2023

Alex J. Keoskey, Esq., Healthcare and Litigation Partner and Jason E. Marx, Esq., Tax, Trusts & Estates Partner at Mandelbaum Barrett PC will be exhibiting at the NJAOPS TriState Medical Conference on September 28th, 2023 at the Hyatt Regency in Morristown, NJ. The New Jersey Association of Osteopathic Physicians and Surgeons (NJAOPS) is the sixth […]

Mandelbaum Barrett PC Special Needs attorneys to present “Planning for Families with Special Needs Children”

April 26, 2023

Working with parents and caregivers of children with special needs daily, we understand the importance of considering your child’s future and we have created a seminar just for you. We want to help you understand the process to ensure that you have a plan in place so that your child will continue to receive the […]

The Elder Law Attorneys at Mandelbaum Barrett PC will present “Legacies Instead of Litigation” on April 18th

March 20, 2023

Our Elder Law Team will be presenting “Legacies Instead of Litigation” on April 18th at 8am at 3 Becker Farm Road in Roseland. You can attend in-person or via zoom and a light breakfast will be served. “Legacies Instead of Litigation – Tips to Stay Out of Court for the Aging Population.” The modern American […]

The Elder Law Attorneys at Mandelbaum Barrett PC to Present a “Hot Topics in Elder Law” Speaker Series Starting in March

January 31, 2023

The Elder Law Attorneys at Mandelbaum Barrett PC is excited to announce our new “Hot Topics in Elder Law” Speaker Series starting March 8th at 6pm at our Roseland campus. The topic for March will be “Myths and Misconceptions in Estate and Medicaid Planning.” Please contact kdavey@mblawfirm.com or (973)243-7969 for more details and to register. […]

The Elder Law attorneys at Mandelbaum Barrett PC to present Estate Planning seminar at Arbor Terrace Roseland titled “7 Biggest Estate Planning and Asset Preservation Myths”

December 20, 2022

The Elder Law attorneys at Mandelbaum Barrett PC are pleased to be presenting an Estate Planning Seminar to the families of Arbor Terrace in Roseland, NJ, sponsored by TheKey, on January 11th, 2023. Moderated by Elder Law Chair Richard Miller, Esq., attorneys Jason Marx, Esq., Shawna Kirchner Brown, Esq., Donald “Donny” A. Dennison, Esq. and Jacqueline Yarmo, Esq. will discuss the […]

Mom died. How can we deduct property taxes on her house? – Jason Marx Authors for NJ.com

November 7, 2022

Q: My mother, 96, died in July of 2022. Her house remains in her name. While the house is technically titled in her name, I assume that as of the date of her death, it became part of her estate. Property taxes are due soon. If these property taxes are paid out of her estate, […]