Leaving It All to Your Spouse? Why a Bypass Trust Still Deserves a Look

Estate planning for substantial separate property in a second marriage

Leaving It All to Your Spouse? Why a Bypass Trust Still Deserves a Look

Many married individuals assume the simplest plan is also the best one: leave everything to the surviving spouse, defer any tax, and let the next generation sort things out later. For couples with modest estates, that instinct is often correct. But for an individual who brought substantial separate property into a marriage — particularly a later or second marriage involving children from a prior relationship — the “everything to my spouse” plan can quietly cost the family far more than it saves, and it can send assets in a direction the planner never intended.

This article walks through two approaches to a representative estate of roughly $20 million in separate property, and explains why a bypass trust remains a powerful tool even under today’s historically high exemptions.

The Exemption Landscape in 2026

The One Big Beautiful Bill Act, enacted in July 2025, permanently set the federal estate, gift, and generation-skipping transfer (GST) tax exemption at $15 million per individual ($30 million for a married couple) beginning January 1, 2026, indexed for inflation thereafter. The top transfer-tax rate remains 40 percent, and assets included in a decedent’s estate continue to receive a stepped-up income tax basis at death.

With exemptions this high, many families will owe no federal estate tax at all. But “no tax today” is not the same as “no planning needed” — especially where assets are expected to grow, where there are children from a prior marriage, or where a state imposes its own estate or inheritance tax with a far lower threshold.

Scenario One: Everything to the Surviving Spouse

Suppose the entire $20 million passes outright to the surviving spouse. Thanks to the unlimited marital deduction, the federal estate tax at the first death is zero. The spouse receives the full estate with no immediate tax cost.

The exposure surfaces at the second death. Whatever remains is now part of the surviving spouse’s taxable estate. Portability allows the surviving spouse to add the deceased spouse’s unused exemption to her own, which can shelter a large estate — but portability has real limitations.

The ported amount is frozen at the first spouse’s death and is not indexed for inflation, the GST exemption is not portable at all, and an estate tax return must be timely filed to make the election. Most importantly, an outright bequest gives the surviving spouse complete control: she may spend the assets, leave them to a new spouse, or direct them to her own children rather than to the children of the first marriage.

In short, this approach defers tax but leaves post-death growth exposed, wastes the inflation protection built into the exemption, and surrenders control over where the assets ultimately land.

Scenario Two: A Bypass Trust for the Children

Now suppose the plan directs $5 million into a bypass trust (also called a credit shelter trust) for the children, with the remaining $15 million passing to the surviving spouse. At the first death, the $5 million uses a portion of the decedent’s exemption, the $15 million qualifies for the marital deduction, and the federal estate tax is again zero.

The difference is what happens next. The $5 million in the bypass trust now sits outside both spouses’ taxable estates. It can grow for years — and all of that growth escapes estate tax at the second death, something portability cannot replicate. The surviving spouse can be given income from the trust, and even access to principal under defined standards, while the remainder is preserved for the children. When the surviving spouse later dies, the bypass trust is not included in her estate, and the children receive it free of additional federal estate tax.

For a blended family, the non-tax benefits are often decisive. The bypass trust guarantees that the separate property the planner built reaches his children, shelters those assets from a future remarriage or creditor claims, and removes the risk that the surviving spouse’s own estate plan redirects the inheritance.

Tailoring the Children’s Share

The structure is flexible. The split need not be $5 million and $15 million — it can be sized to the planner’s goals and adjusted during life as the exemption, the estate, and the family circumstances change. The trust for the children (here referred to generically as “children,” though specific ages, named beneficiaries, or a tiered “waterfall” of distributions at successive ages can be written directly into the document) can distribute outright, hold in further trust for protection, or stagger distributions over time. The same architecture works whether the goal is a fixed dollar amount to the next generation or a full use of the available exemption.

The Takeaway

Higher exemptions have made federal estate tax a non-issue for many families, but they have not eliminated the case for thoughtful structure — particularly for individuals with significant separate property and children from a prior marriage. A bypass trust captures future growth outside the taxable estate, preserves GST planning, protects assets, and ensures that a legacy reaches its intended recipients. The “simple” plan is not always the one that best serves the family.

Every estate is different, and the right structure depends on your assets, your family, and your goals. If you have substantial separate property and want to be certain your plan protects both your spouse and your children, we would welcome the conversation.

Contact The Alford Law Firm to schedule a consultation: https://www.brucealfordlaw.com/dallas-business-law-firm-near-me

This article is provided for general informational purposes only and does not constitute legal or tax advice. Exemption amounts and tax laws are subject to change, and state-level estate and inheritance taxes may apply.