A credit shelter trust in Washington State is a sub-trust that funds at the first spouse’s death with up to that spouse’s Washington estate tax exemption — $3,076,000 for deaths in 2026 — and then sits permanently outside the surviving spouse’s taxable estate, so neither the original principal nor its future growth is taxed by Washington at the second death.1Washington Department of Revenue. Estate Tax For a married couple with combined assets above the exemption, it is the primary tool for using both spouses’ exemptions instead of losing one.
How the Trust Works Mechanically
Most Washington couples set the structure up inside a revocable living trust they create during their lifetimes. The living trust manages assets while both spouses are alive and avoids probate at death.2Consumer Financial Protection Bureau. What Is a Revocable Living Trust? When the first spouse dies, a formula clause in the document splits assets into two buckets. The credit shelter trust — also called a bypass trust, B trust, or family trust — receives assets up to the deceased spouse’s available Washington exemption. Everything else flows to a marital trust (the A trust) or passes outright to the surviving spouse.
Assets going to the marital trust or to the spouse directly qualify for the unlimited federal marital deduction, so nothing is taxed at the first death either way.3Office of the Law Revision Counsel. 26 U.S. Code 2056 – Bequests, Etc., to Surviving Spouse The difference shows up later. Marital trust assets remain part of the surviving spouse’s estate and are exposed to Washington tax at the second death. Credit shelter trust assets are gone from the survivor’s estate for tax purposes. Any appreciation between the two deaths escapes Washington estate tax too.
Why Portability Does Not Solve This in Washington
Federal law lets a surviving spouse inherit the deceased spouse’s unused federal exemption by filing a portability election on Form 706. The federal exemption for 2026 is $15,000,000 per person after the One, Big, Beautiful Bill Act permanently raised it, and it will be indexed for inflation starting in 2027.4Internal Revenue Service. What’s New – Estate and Gift Tax5Office of the Law Revision Counsel. 26 U.S. Code 2010 – Unified Credit Against Estate Tax At those levels, most couples have no federal estate tax to worry about.
Washington is different. The state has no portability provision. When the first spouse dies, that spouse’s $3,076,000 state exemption is either used or lost.1Washington Department of Revenue. Estate Tax A couple who leaves everything to the survivor outright uses one exemption. A couple who funds a credit shelter trust at the first death uses two. On an estate near or above the exemption threshold, that is the entire question.
What Washington Now Taxes at the Second Death
The 2026 Washington exemption of $3,076,000 is adjusted annually using the Seattle-area consumer price index.1Washington Department of Revenue. Estate Tax Above the exemption, Washington applies a progressive rate schedule that was steepened significantly for deaths after June 30, 2025. The top rate rose from 20% to 35%.6Washington State Legislature. RCW 83.100.040 Estate Tax Imposed – Amount of Tax The current brackets on the taxable estate:7Washington Department of Revenue. Estate Tax Tables
- $0 to $1,000,000: 10%
- $1,000,000 to $2,000,000: 15%
- $2,000,000 to $3,000,000: 17%
- $3,000,000 to $4,000,000: 19%
- $4,000,000 to $6,000,000: 23%
- $6,000,000 to $7,000,000: 26%
- $7,000,000 to $9,000,000: 30%
- $9,000,000 and above: 35%
Consider a couple with $6 million combined. If they leave everything to the survivor, roughly $2.9 million is exposed to Washington tax at the second death. If they properly fund a credit shelter trust at the first death, both exemptions are used and the Washington tax can be eliminated for estates at or below about $6,152,000. The higher the rate schedule climbs, the larger that difference gets.
Funding the Trust in a Community Property State
Washington is a community property state. Property acquired by either spouse during the marriage is community property, and each spouse owns an undivided half interest in every community asset.8Washington State Legislature. RCW 26.16.030 Community Property Defined Separate property includes assets owned before the marriage or received by gift or inheritance.
Only the deceased spouse’s legal interest can fund the credit shelter trust. For community property that is one-half of each asset. For separate property it is the entire asset. Valuation is set at the date of death, and real estate or business interests generally require a formal appraisal to fix fair market value. The formula clause then directs the funding amount into the B trust and sends the rest to the marital trust.
Which assets go where matters. Assets expected to appreciate strongly are the best candidates for the credit shelter trust, because all future growth will be outside the survivor’s Washington estate. Stable, income-producing assets often fit better in the marital trust. And titling has to match the plan: if assets are not properly titled in the name of the living trust before the first death, the funding formula cannot operate as designed, and the estate may need to go through probate to move them.
The Basis Step-Up Trade-Off
The tool has a real cost on the income tax side, and it is worth understanding before committing. Under federal law, property included in a decedent’s taxable estate receives a new cost basis equal to its fair market value at death, which erases capital gains on lifetime appreciation.9Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent At the first death, everything gets that step-up, including the assets that fund the credit shelter trust.
The paths diverge at the second death. Marital trust assets are in the survivor’s estate, so they get a second step-up. Credit shelter trust assets are not in the survivor’s estate — that is the whole point — so they do not. Heirs who later sell those assets pay capital gains on all appreciation between the two deaths.
A credit shelter trust funded with $3 million that grows to $5 million by the second death leaves heirs with $2 million of built-in gain. At current federal long-term capital gains rates, the tax on that can easily exceed $400,000. Whether the state estate tax savings outweigh the lost step-up depends on the size of the estate, expected appreciation, and how soon heirs plan to sell. For estates only modestly over the exemption, the honest answer is sometimes to skip the trust and pay Washington’s tax at the second death. Run both scenarios with an attorney.
What the Surviving Spouse Can and Cannot Do
Once funded, the credit shelter trust is irrevocable. The surviving spouse is typically named as trustee, which preserves day-to-day control. But if the surviving spouse has unrestricted power to pull principal out, the IRS treats the trust assets as part of the survivor’s estate, and the plan fails.
Federal law solves this with what it calls an ascertainable standard. A trustee’s power to distribute principal to themselves is not a general power of appointment, and does not pull the assets back into the taxable estate, as long as distributions are limited to health, education, support, or maintenance.10Office of the Law Revision Counsel. 26 USC 2041 – Powers of Appointment Planners abbreviate this as the HEMS standard.
In practice HEMS is broader than it sounds. Medical bills, property taxes, insurance, home repairs, educational costs for beneficiaries, and travel consistent with the couple’s established lifestyle generally qualify. What it prevents is withdrawing principal to make gifts to third parties or to pursue ventures unrelated to the survivor’s own support. The surviving spouse also receives the trust’s net income for life. Between full income rights and reasonable access to principal, most survivors notice little lifestyle change.
Because the trust is irrevocable, the surviving spouse cannot redirect it to new beneficiaries — a protection for children if the survivor remarries. The assets also sit outside the survivor’s reach for creditor purposes. When the survivor dies, whatever remains passes to the named beneficiaries outside probate and free of Washington estate tax.
If a Family Business Is in the Estate
Washington offers a separate deduction that can stack with a credit shelter trust when the estate includes a qualifying family business. The qualified family-owned business interest (QFOBI) deduction allows up to $3,076,000 in business value to be deducted from the Washington taxable estate for a 2026 death, on top of the exclusion.11Washington Department of Revenue. Estate Tax Qualified Family-Owned Business Interests
The conditions are strict. The business must be valued at $6,000,000 or less. The decedent or family members must have owned and materially participated for at least five of the eight years before death. The QFOBI must represent more than 50% of the Washington taxable estate after the exclusion. And the heir must continue operating the business for at least three years or the tax savings is clawed back, with the heir personally liable.11Washington Department of Revenue. Estate Tax Qualified Family-Owned Business Interests For a family business owner with a $6 million estate, combining QFOBI with a properly funded credit shelter trust can potentially zero out the Washington estate tax. The interaction is technical, and an attorney who prepares these returns should design it.