Annulment Time Frame in Washington: Deadlines and Who Can File

The time frame for an annulment in Washington isn’t a calendar deadline. Under RCW 26.09.040, the window depends on which legal ground you’re relying on and, for most grounds, on whether you kept living with your spouse after you learned about the problem or were free to leave it. Keep cohabiting voluntarily once the disqualifying condition ends, and the court treats the marriage as ratified and won’t declare it invalid.¹

Washington calls this proceeding a declaration of invalidity rather than an annulment, but the practical question people ask is the same: how long do I have?

How the Clock Works for Most Grounds

Washington doesn’t say “file within 90 days” or “file within two years.” The limitation is behavioral. The statute asks whether, after the disqualifying condition ended, the couple voluntarily lived together as spouses. If they did, the marriage is ratified and the door to annulment closes.¹

What counts as “the condition ending” depends on the ground:

Fraud involving the essentials of marriage. The clock starts when you discover the fraud. Continuing to live with your spouse after finding out counts as ratification.
Force or duress. The clock starts once the coercion stops. Staying together voluntarily after that point ratifies the marriage.
Lack of capacity from mental incapacity, intoxication, or other incapacitating substances. The clock starts when the affected party regains the ability to consent. Voluntary cohabitation afterward ratifies.
Underage marriage. The clock starts when the underage party turns 18. Voluntarily living together as spouses after that birthday ratifies the marriage. Washington law now treats every marriage as void if either person was under 18 at the ceremony.²

So the practical rule for these grounds is simple: once you know about the problem or are free of it, don’t resume living together as a couple if you want to preserve your right to annul. There is no separate filing deadline layered on top of that; the ratification question is the deadline.

Bigamy and Close Family Relationships: No Time Limit

Two grounds sit outside the ratification framework because the disqualifying condition never ends. A prior undissolved marriage either exists or it doesn’t. A blood relationship closer than second cousins doesn’t change over time.³ Because there is no moment when the condition ends, cohabitation can’t ratify these marriages. They can be challenged at any point while both parties are still alive.¹

The court can also invalidate a marriage performed in another state if that marriage was void or voidable where it was contracted.¹

Who Can File, and When It’s Too Late Entirely

For most grounds, either spouse can file, and the guardian of a spouse who lacks capacity can file on that spouse’s behalf. Bigamy expands the list: the legal spouse from the prior marriage or a child of either party can also bring the petition.¹

Both parties must be alive when the petition is filed. Washington does not allow a posthumous annulment.

After You File: Response Deadlines

Once the petition is filed, the other party has to be formally served, and the response window depends on how service happens:

No 90-Day Waiting Period

Washington divorces carry a mandatory 90-day cooling-off period after filing and service before a court can enter a final decree.⁶ Annulments do not. If both sides agree the marriage is invalid and any related issues are resolved, the court can finalize the case as soon as the response deadline passes and a hearing is available. Contested annulments run longer, sometimes several months, while the court works through the disputed grounds or related questions about property, support, or a parenting plan.

The bottom line on timing: watch the behavioral trigger, not a calendar. For fraud, duress, capacity, and underage marriages, the moment you know about the problem or are free of it is the moment your window is measured from, and voluntarily resuming life as a couple after that closes it. For bigamy and prohibited-relationship marriages, no cohabitation ratifies the union, and the petition can be filed at any time while both spouses are living.

1
Washington State Legislature. RCW 26.09.040 Petition to Have Marriage or Domestic Partnership Declared Invalid
2
Washington State Legislature. Washington Code Chapter 26.04 – Marriage
3
Washington State Legislature. RCW 26.04.020 Prohibited Marriages
4
Washington State Courts. Washington Superior Court Civil Rule 12 – Defenses and Objections
5
Washington Courts. Washington Superior Court Civil Rules – CR 4 Process
6
Washington State Legislature. RCW 26.09.030 Petition for Dissolution of Marriage or Domestic Partnership