What a Bypass Trust Actually Does
A bypass trust, also called a credit shelter trust, lets a married couple use both spouses’ Massachusetts estate tax exemptions instead of losing the benefit of one when the first spouse dies. The Massachusetts filing threshold is $2 million per person. Being married does not automatically give the surviving spouse a $4 million exemption, and that surprises almost everyone who assumed that leaving everything to each other was the simple, safe choice. See the Massachusetts Estate Tax Guide for the filing rules.
Massachusetts Does Not Have Estate Tax Portability
The reason comes down to a word most people have never had to learn: portability. Federal law has it. Since January 1, 2011, the estate of someone survived by a spouse may elect to pass the unused federal exemption to that spouse, and the election is made on a timely filed federal estate tax return. See the IRS guidance on the federal estate tax.
Massachusetts does not offer the same thing, and the Department of Revenue explains why in a single line of its own guide: “Changes to the federal estate tax law after December 31, 2000, have no impact on the Massachusetts estate tax.” Federal portability arrived a decade after that cutoff date. Making the federal election does not move an unused Massachusetts exemption anywhere. If your plan quietly assumes the survivor gets to combine both, it may produce a very different result than you expected.
A Simple Example With Round Numbers
A married couple has $4 million, with $2 million belonging to each spouse. The husband dies, and everything passes outright to his wife. Assuming the marital deduction applies, there may be no Massachusetts estate tax at that first death. That looks like the plan worked, and for that transfer, it did.
But the wife now owns the entire $4 million. If she later dies owning that amount, she has her own Massachusetts exemption available, while her husband’s unused exemption did not follow the money into her estate. Nothing went wrong on the day of the first death. The cost shows up at the second one.
How the Trust Changes the Result
A properly structured bypass trust changes where the first spouse’s assets go. Instead of passing outright to the survivor, an appropriate amount passes into a separate trust that uses the deceased spouse’s available exemption. The surviving spouse can still benefit from that trust under its terms, but the assets are structured to remain outside the survivor’s taxable estate.
In the example above, the husband’s $2 million could fund the bypass trust while the wife keeps her own $2 million. Assuming proper drafting, funding, and administration, and no other facts changing the calculation, both exemptions can do their intended jobs. If you want to see roughly where your own estate sits, our Massachusetts Estate Tax Calculator will show you the number.
“Bypass” Does Not Mean Bypassing Your Spouse
The word makes people think the surviving spouse is being cut out financially. That is not necessarily how the trust works. The survivor may receive income and may have access to principal for purposes permitted by the document. Depending on the design, the survivor may also serve as a trustee. What the survivor generally cannot have is unrestricted ownership and control that would pull the assets right back into the taxable estate. The job is to balance access, flexibility, and the tax result, rather than to promise all three without limitations.
Ownership and Beneficiary Designations Decide Whether It Works
This requires more than inserting a paragraph into a trust. Ownership matters. Beneficiary designations matter. If every asset passes directly to the surviving spouse regardless of what the estate planning documents say, the intended trust may never receive what it needs. The plan has to account for the house, investment accounts, retirement assets, life insurance, and the way each asset will actually transfer. That is one reason the legal documents and the financial accounts need to be reviewed together, and why trust funding is a step in its own right rather than an afterthought.
The Tradeoffs Are Real
A bypass trust usually requires separate administration after the first death, and income tax filings may be necessary. Assets excluded from the survivor’s estate generally do not receive another basis adjustment merely because the survivor later dies. That can matter when a trust holds appreciated real estate or investments. Saving estate tax is valuable, but the right recommendation considers the income tax consequences and the survivor’s practical needs as well. It is also worth thinking early about who should serve as trustee, because someone has to run it.
Where We Would Start
We would start by looking at what you own, how you own it, and what life should look like for the surviving spouse. A bypass trust can be a useful way to preserve both Massachusetts exemptions, but it should earn its place in your plan rather than be added because it sounds sophisticated. The point is to understand what happens at each death while there is still time to make deliberate choices. If you are still working out the basics, start with how the Massachusetts estate tax works.
Not sure whether any of this applies to you? Start with a free 15-minute consult call with Nicole Ott, our Lead Intake Coordinator. She will listen to your situation and tell you honestly whether this is the kind of problem we handle.
