For most married couples choosing between a joint trust vs separate trusts, a joint revocable trust is the simpler and cheaper fit when you’re in a first marriage, own most things together, and want the same people to inherit. Separate trusts earn their added complexity when either spouse has children from a prior relationship, significant pre-marital or inherited property, exposure to lawsuits or business creditors, or an estate large enough to need tax planning beyond a basic portability election. Where you live matters too: community property states give joint trusts a tax advantage that common law states do not.
What Each Structure Actually Is
A joint revocable living trust is one document created by both spouses together. You both act as co-trustees, share control over every asset in the trust, and in most drafting, either spouse can buy, sell, or manage trust property without the other’s signature. When the first spouse dies, the survivor typically takes over as sole trustee.
Separate trusts are two individual documents. Each spouse names their own trustee and beneficiaries and funds the trust with their own assets. Jointly owned property has to be divided and retitled so each share lands in the right trust. The structural line shows up most clearly after a death: a deceased spouse’s separate trust becomes irrevocable automatically, while the survivor’s trust stays fully under their control.
When a Joint Trust Is the Better Fit
A joint trust works well when the following conditions line up:
- You’re in a first marriage with shared children, so individual control over who inherits matters less.
- Most of what you own was acquired together during the marriage, so splitting assets into two trusts creates paperwork without much practical benefit.
- Your estate is well below the federal estate tax threshold, which eliminates most of the tax-planning reasons to separate.
- You want lower setup costs. Professional fees for a basic revocable living trust run roughly $1,500 to $5,000, so drafting one document instead of two is a real saving.
Day-to-day management is easier too. You don’t have to track which spouse owns which account or decide how to split a jointly purchased rental property. Everything is in one trust, and you both manage it.
When Separate Trusts Make More Sense
Separate trusts earn their complexity in several situations:
- Blended families. If either spouse has children from a previous relationship, separate trusts let each spouse lock in who inherits their share. In a basic joint trust, the survivor can amend the terms after the first death and redirect everything to their own children.
- Significant separate property. Assets you owned before the marriage, inherited, or received as gifts are often legally separate. Keeping them in your own trust preserves their character.
- Creditor concerns. If one spouse works in a profession with high lawsuit exposure, separate trusts can help shield the other spouse’s assets. In a joint trust, a creditor with a judgment against one spouse may be able to reach the entire trust.
- Different planning goals. One spouse may want to leave assets to charity, fund education for specific relatives, or impose conditions on distributions. Separate trusts let each spouse design a plan without compromise.
What Happens When the First Spouse Dies
This is where the choice has its most concrete consequence, and it’s the part couples most often overlook up front.
Joint Trust After the First Death
In the simplest version of a joint trust, the surviving spouse inherits full control and can amend or revoke the trust entirely. The deceased spouse’s wishes become unenforceable once that spouse is gone. For couples who are each other’s only intended beneficiaries, that’s fine. For anyone else, it’s a problem.
Many estate planning attorneys address this by drafting a joint trust that automatically splits into sub-trusts at the first death. A common structure is the AB trust: the trust divides into an “A” trust (the survivor’s trust, which stays revocable) and a “B” trust (the deceased spouse’s trust, which becomes irrevocable). The surviving spouse can typically draw income from the B trust and reach principal for health, education, maintenance, and support, but cannot change the ultimate beneficiaries.
Separate Trust After the First Death
With separate trusts, the deceased spouse’s trust becomes irrevocable automatically. The survivor cannot change its terms, redirect its assets, or merge it with their own trust. For blended families, that is the cleanest way to guarantee each spouse’s children receive what was intended.
The Basis Step-Up and Community Property
When someone dies, the IRS adjusts the cost basis of their assets to current fair market value. This step-up in basis eliminates capital gains tax on all the appreciation that occurred during the person’s lifetime. How much step-up you get depends on where you live and how your trust is structured, and the dollars can be substantial.
Common Law States: Typically a 50% Step-Up
In common law states, assets in a joint trust between spouses generally receive only a 50% basis step-up at the first death. Each spouse is treated as owning half, so only the deceased spouse’s half is adjusted.
Say you bought a home for $200,000 that’s now worth $600,000. When the first spouse dies, the surviving spouse’s new basis is $400,000: the original $100,000 on the survivor’s half, plus the stepped-up $300,000 for the deceased spouse’s half. Sell for $600,000 and $200,000 of gain is taxable.
Community Property States: A Full Step-Up
Nine states follow community property rules: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. Assets acquired during the marriage are considered owned equally. At the first death, both halves of the community property receive a full step-up, not just the deceased spouse’s half.1Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent
Using the same example, that home steps up fully to $600,000. If the survivor sells the next day, the capital gains tax is zero. For couples with highly appreciated real estate or investments, the difference can run into tens or hundreds of thousands of dollars.
This cuts against separate trusts in community property states. Splitting community property into two separate trusts can inadvertently convert it to separate property and cost the couple the full step-up. A joint trust holding community property is often the more tax-efficient structure in those nine states.
Some planners in common law states draft joint trusts giving the first spouse to die a testamentary general power of appointment over the whole trust, which pulls the full value into the deceased spouse’s taxable estate and qualifies the entire trust for a step-up under federal law.1Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent It only makes sense when the estate is small enough that the added inclusion won’t trigger estate tax, which at current exemption levels applies to the vast majority of couples.
Estate Tax and Portability
The federal estate tax exemption for 2026 is $15,000,000 per individual, so a married couple can shield up to $30,000,000.2Internal Revenue Service. What’s New – Estate and Gift Tax That puts estate tax planning out of reach for most families. For couples near or above the threshold, trust structure matters a lot.
Federal law lets a surviving spouse use any portion of the deceased spouse’s unused estate tax exemption. This is the deceased spousal unused exclusion, or DSUE. To claim it, the estate’s representative must file a federal estate tax return (Form 706) within nine months of the death, with an available six-month extension.3Internal Revenue Service. Frequently Asked Questions on Estate Taxes If you miss that deadline and the estate wasn’t otherwise required to file, a simplified late-filing procedure allows a portability election up to five years after the date of death.4Internal Revenue Service. Instructions for Form 706
Portability changed the calculus. Before it existed, the only way to use both spouses’ exemptions was to split assets into separate trusts or use an AB structure. Now, a simple joint trust can preserve both exemptions with the right paperwork. Portability has limits though: it doesn’t shelter later appreciation of the exemption amount, doesn’t apply to the generation-skipping transfer tax, and can be lost if the surviving spouse remarries and the new spouse dies first. Couples in the $10 million to $30 million range should ask their attorney whether an AB trust or separate trusts give more reliable protection than relying on portability.
Creditor Exposure
A revocable trust, whether joint or separate, offers no creditor protection during your lifetime. Because you can revoke it at any time and take the assets back, courts treat them as still belonging to you.
The difference emerges after the first death. In a joint trust, assets generally stay reachable by the surviving spouse’s creditors because the survivor keeps full control. With separate trusts, the deceased spouse’s trust becomes irrevocable, and assets inside it are typically shielded from the survivor’s creditors. If one spouse carries real liability exposure from a business, profession, or personal debts, separate trusts build a firewall a joint trust does not. State laws on creditor access to trust assets vary, so an attorney familiar with your state’s rules can tell you how much protection a given structure actually gives you.
If the Marriage Ends
Joint trusts complicate divorce. Both spouses are grantors and beneficiaries of the same document, so unwinding it is part of the settlement. Most states automatically revoke provisions benefiting a former spouse in estate planning documents on divorce, but the details vary and relying on automatic revocation is risky. The safer path is to revoke the joint trust entirely as part of the settlement, divide the assets, and have each spouse create a new individual plan. Courts can also order specific distributions of trust assets during the proceeding.
Separate trusts present fewer complications. Each spouse already controls their own trust, so division still requires negotiation over shared property but neither spouse has to dismantle the other’s estate plan.
How to Decide
Start with the family picture. First marriage, shared children, assets built together: a joint trust keeps things simple and the tax trade-offs are usually minor. Add any of the following and separate trusts start earning their keep:
- Children from a prior relationship for either spouse.
- Significant separate property one of you brought in or inherited.
- Lawsuit or business creditor exposure on one side.
- An estate large enough that portability alone isn’t a confident answer.
Then layer the state rule on top. Couples in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin should weigh the automatic full basis step-up community property receives in a joint trust before splitting assets into separate trusts and giving that up. The right structure comes from getting these details right together, and an experienced estate planning attorney in your state is the person best equipped to walk you through them.