How a Bypass Trust Works (and When It Matters in Oregon, CALIFORNIA AND WASHINGTON)

If you’re married and thinking about estate planning, you’ve probably heard the term “bypass trust” (sometimes called a credit shelter trust or A/B trust).

It’s a classic planning tool, but whether you actually need one depends a lot on where you live. This is a conversation I have with with every married couple I work with.

Let’s walk through how it works in Oregon, and then compare it to Washington and California.

What Is a Bypass Trust?

A bypass trust is a trust created at the first spouse’s death.

Instead of everything going outright to the surviving spouse, a portion of the estate is:

1. Set aside in a separate trust (the bypass trust), and

2. Not included in the surviving spouse’s estate later on

The key benefit: It allows a married couple to use both spouses’ estate tax exemptions, rather than wasting the first spouse’s exemption.

How It Works (Simple Example)

Here’s a simple fact pattern to understand the mechanics:

Husband and Wife live in Oregon

Combined estate = $3 million

Oregon estate tax exemption = $1 million per person

Without a bypass trust:

When the first spouse dies, everything goes to surviving spouse (no tax yet due to marital deduction)

When the second spouse dies, the entire $3M taxed

In other words, only one $1M exemption used

Result: $2M subject to Oregon estate tax

With a bypass trust:

When the first spouse dies, $1M goes into bypass trust

The remaining $2M goes to surviving spouse

At second death:

The bypass trust is not taxed again

The surviving spouse’s estate = $2M

The surviving spouse uses their own $1M exemption

Result: Only $1M taxed

Why This Matters in Oregon

Oregon has:

A $1 million estate tax exemption (this may change, but it’s what we currently have)

There is no what’s called “portability” (you can’t transfer unused exemption between spouses)

This combination is critical from an estate tax perspective.

Bottom line:

In Oregon, a bypass trust is often:

Highly relevant

One of the most effective ways to reduce estate taxes for married couples

How It’s Typically Used Today

Modern plans don’t always force a bypass trust. Instead, many use:

1. Disclaimer Planning (very common)

Everything goes to the surviving spouse unless they choose to “disclaim” assets into a bypass trust after death.

Benefits:

Flexibility based on asset values and law changes

Surviving spouse keeps control if no tax issue

This is typically how I structure plans

2. Formula Funding

The trust automatically funds up to:

The Oregon exemption amount

Or a defined cap

More structured, less flexible

3. Hybrid Plans (most sophisticated)

Combine bypass + marital trust (QTIP)

Allow post-death tax optimization

The Tradeoffs

Bypass trusts are powerful, but there are pros and cons:

Pros:

Reduces or eliminates Oregon estate tax

Protects appreciation from future taxation

Can provide asset protection for beneficiaries

Cons:

More complexity

Separate trust administration

Surviving spouse doesn’t have full ownership/control

How This Differs in Washington and California

Washington

Washington also has a state estate tax, but:

The exemption is ≈ $3 million per person

No portability (like Oregon)

What this means:

Bypass trusts are still relevant

But fewer couples need them compared to Oregon

They are typically used when:

Estate is above $3M–$6M combined

Significant appreciation of assets is expected

California

California is completely different:

There is no state estate tax

Only the federal estate tax applies

Federal exemption ≈ $15M+ per person (currently)

Federal portability exists (unlike Oregon and Washington)

What this means:

Bypass trusts are often unnecessary for tax purposes

Most couples rely on simple revocable trusts and portability elections

Bypass trusts may still be used for other perfectly valid reasons such as:

Asset protection

Control over distributions

Blended family planning

…but not typically for tax savings

Final Takeaway

A bypass trust isn’t “one size fits all.”

In Oregon, it’s often a core tax strategy

In Washington, it’s situational

In California, it’s usually about non-tax goals

Practical Advice

If you’re married and live in Oregon (or might retire here):

You should at least consider a bypass trust structure, even if implemented through a flexible (disclaimer-based) plan.

The goal isn’t complexity—it’s making sure you don’t accidentally leave hundreds of thousands of dollars on the table.

If you want help evaluating whether a bypass trust makes sense for your situation, feel free to reach out. It’s one of those planning decisions where a small structural change can make a big long-term difference.