Credit Shelter
If you’ve ever heard the phrase credit shelter trust and thought it sounded intimidating, you’re not alone. Plenty of folks feel overwhelmed trying to figure out what it is, how it works, and whether they even need one. But in truth, a credit shelter trust is surprisingly simple once you see how the pieces fit together. Let’s break it down, plain English style.
I’m Jeffrey G. Marsocci, the Plain English Attorney, and here’s what you need to know.
Why Married Couples Often Use an ABC Trust
When a married couple sets up a joint revocable living trust, they’re doing it for a few key reasons:
✅ Avoiding probate
✅ Keeping control during their lives
✅ Providing for each other if one passes away
In this setup, both spouses are the trustors (creators of the trust), trustees (managers of the trust), and first-level beneficiaries (the ones benefiting from the trust during their lifetimes). Everything runs smoothly, and assets titled in the name of the trust—like bank accounts, investment accounts, real estate, and even personal items—avoid the probate courts.
But what happens when one spouse dies? That’s when the ABC trust steps in to do its job.
Breaking Down the A, B, and C Buckets
Upon the death of the first spouse, the joint trust splits into three separate “buckets”:
- A Trust (the survivor’s revocable trust): The surviving spouse still controls this part and can change it as needed.
- B Trust (the decedent’s irrevocable trust, or “credit shelter trust”): Holds the deceased spouse’s share, locking in their estate tax exemption and protecting those assets and their growth from future estate taxes.
- C Trust (the QTIP or “overflow” trust): Handles anything that goes over the deceased spouse’s exemption, still benefiting the survivor but preserving tax advantages.
This structure allows you to use every available estate tax exemption, even if the laws change later. Think of it as maximizing your “tax coupons” while protecting your family.
Why Not Just Leave Everything to the Survivor?
People sometimes ask, Why not skip all these buckets and just leave everything outright to my spouse?
Well, let’s travel back in time when the exemptions were only $1 million per person, and say the estate is $2 million, and you leave it all to your surviving spouse. Years later, when that spouse passes away, they only have their own $1 million tax exemption to use. That means the extra $1 million could get hit with estate taxes, costing hundreds of thousands of dollars unnecessarily.
By splitting things up into the A, B, and C trusts, you essentially preserve both spouses’ estate tax exemptions, avoiding a costly tax bill later on.
Putting It Into Action: A $3 Million Example
Let’s walk through a simple scenario with that same $1 million exemption from year’s past.
Imagine a couple has a $3 million estate. After the first spouse dies, their share of $1.5 million goes into the B trust, but the deceased spouse’s tax coupon only covers $1 million. So what happens to the extra $500,000?
That goes into the C trust, which is another irrevocable trust designed to protect the surviving spouse’s access to income while keeping estate tax advantages in place.
At the end of the day, you have:
- $1.5 million in the A trust (under the surviving spouse’s control)
- $1 million in the B trust (locking in the deceased spouse’s exemption)
- $500,000 in the C trust (protecting the rest from immediate taxes)
This way, the surviving spouse is still financially secure, and you get maximum tax benefits.
Why You Still Need This, Even with High Exemptions
Right now, the federal estate tax exemption is around $15 million per person (as of July 4, 2025). Most folks think, I’ll never hit that.
But the problem is, Congress can change those numbers anytime—and states like Massachusetts, New Jersey, and Rhode Island have much lower exemption thresholds. Setting up an ABC trust structure is a just-in-case measure, giving you flexibility no matter what future lawmakers do.
As I always tell clients, It’s better to have it and not need it than to need it and not have it.
A Cautionary Tale
I once heard a story from Henry W. Abts III, author of The Living Trust, who told us how a client turned down the B and C trust provisions to save a mere fifty dollars. When that couple passed away, their son discovered they owed hundreds of thousands in estate taxes. Henry had the signed waiver showing they refused the credit shelter trust—and the son was devastated to learn they could have saved all that money for just fifty bucks.
After that, Henry’s team stopped charging extra for these provisions, and I do the same for my clients. There’s just no reason to skimp on protection.
So… What About Portability?
Some of you might have heard about portability, which lets a surviving spouse claim their deceased spouse’s unused tax exemption. Is that better than a credit shelter trust?
That’s a great question—and one I’ll answer in an upcoming video and blog. Keep an eye out, because we’ll break down portability versus the ABC trust so you can see exactly which strategy makes sense for your family.
If you found this explanation helpful, please head over to my YouTube channel and subscribe, like, and comment on the video at www.YouTube.com/nclawyer. Educational information like this can get buried by the algorithm, so your engagement helps more people find it.
And as always, stay safe, plan ahead, and enjoy life. Whatever you do—make it a great
day!